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Tytuł:
SNR of EGNOS satellites in Southern Baltic area
Autorzy:
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/224414.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
maritime navigation
navigational systems
EGNOS
satellite positioning
satellite navigation
DGPS
satellite geodesy
Opis:
Introduction to using EGNOS system made possible determining of position in navigation and measurement applications. High accuracy of determined position, at precision of system DGPS level, allowed for taking advantage of that system in hydrographic measurements. In article are presented observations from signals transmitted by EGNOS system satelIites in 2005, in the middle of operation activating, to protecting of hydrographic measurements at sea and inland areas.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 281-285
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Landsat and Sentinel-2 images as a tool for the effective estimation of winter and spring cultivar growth and yield prediction in the Czech Republic
Autorzy:
Jelinek, Z.
Kumhalova, J.
Chyba, J.
Wohlmuthova, M.
Madaras, M.
Kumhala, F.
Powiązania:
https://bibliotekanauki.pl/articles/2082908.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
satellite sensors
agriculture
satellite imagery
wheat varieties
Opis:
The influence of climate and topography on crop condition and yield estimates is most effectively monitored by non-invasive satellite imagery. This paper evaluates the efficiency of free-access Sentinel 2 and Landsat 5, 7 and 8 satellite images scanned by different sensors on wheat growth and yield prediction. Five winter and spring wheat cultivars were grown between 2005 and 2017 in a relatively small 11.5 ha field with a 6% slope. The normalized difference vegetation index was derived from the satellite images acquired for later growth phases of the wheat crops (Biologische Bundesanstalt, Bundessorenamt and Chemical industry 55 – 70) and then compared with the topography wetness index, crop yields and yield frequency maps. The results showed a better correlation of data obtained over one day (R2 = 0.876) than data with a one-day delay (R2 = 0.689) using the Sentinel 2 B8 band instead of the B8A band for the near-infrared part of electromagnetic spectrum in the normalized difference vegetation index calculation.
Źródło:
International Agrophysics; 2020, 34, 3; 391-406
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the 11 August 2017 storm in central Poland with satellite data and products
Autorzy:
Łapeta, Bożena
Kuligowska, Elżbieta
Murzyn, Paulina
Struzik, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2142335.pdf
Data publikacji:
2022
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
satellite data
satellite products
convective storm monitoring
Opis:
This paper presents the evolution of the mesoscale convection system as seen on satellite images during all stages: pre-convection, initiation, and maturity. The evolution of any atmospheric phenomenon can be monitored effectively only when the data available have adequate temporal and spatial resolution. In case of convective storms the resolution should be minutes and kilometers. Therefore, data from the METEOSAT geostationary satellite, with 5-minute and 15-minute intervals were used operationally to monitor the storm of 11 August 2017; this was a most destructive storms, concentrated in several districts of the Pomeranian, Greater Poland, and Kuyavian-Pomeranian voivodeships. Analysis demonstrated that some alarming features, like cold rings or cold U/V shapes, can be visible on the single channel satellite images, without even referring to specific convective products. However, the nowcasting of the convective phenomena requires careful analysis of several dedicated products, including stability indices and water vapor content in the troposphere. It has been shown that with comprehensive analysis of the information provided by the different satellite images and satellite derived products, it is possible to draw conclusions about the severity of the observed storms as well as the probability of the occurrence of the extreme weather at the ground.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2022, 10, 2; 1--25
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meteorological satellites since 40 years in IMWM service
Autorzy:
Struzik, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/703199.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
satellite remote sensing
meteorological satellite system
meteorology
hydrology
Opis:
The history of satellite remote sensing applications in IMWM was presented, referring to history of remote sensing and also development and actual state of meteorological satellite system. Main areas of applications were presented together with examples of products generated from satellite data operationally received in IMWM since 40 years. The problem of data resolution from meteorological satellites fulfilling requirements of meteorology were presented on examples of processes for which were designed. Dynamical development of meteorological satellites in recent years were presented focusing on METEOSAT Second Generation and METOP satellites.
Źródło:
Nauka; 2008, 4
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki wpływające na bilans energetyczny łącza satelitarnego w zakresie fal milimetrowych
Factors affecting the energy balance of a satellite connection in the millimetric wave range
Autorzy:
Bogucki, J.
Wielowieyska, E.
Powiązania:
https://bibliotekanauki.pl/articles/317364.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
propagacja
telekomunikacja satelitarna
satelita
propagation
satellite telecommunications
satellite
Opis:
Określono czynniki propagacyjne, mające wpływ na niezawodność pracy łączy satelitarnych pracujących w zakresie fal milimetrowych. Przedstawiono przykładowe obliczenia tras satelitarnych z uwzględnieniem wszystkich tych czynników.
Propagation factors that affect the performance of satellite connections in the millimetric wave range are specified. Examples of satellite route calculations that take into account all those factors are provided.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2005, 1-2; 70-80
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demistyfikacja IKONOSA!
Demistyfication of IKONOS!
Autorzy:
Toutin, T.
Cheng, P.
Powiązania:
https://bibliotekanauki.pl/articles/130236.pdf
Data publikacji:
2000
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
IKONOS
satelita
zdjęcie satelitarne
Ikonos
satellite
satellite image
Opis:
IKONOS, „komercyjny” satelita dostarczający obrazów o najwyższej obecnie rozdzielczości geometrycznej, dostępnej ogółowi użytkowników, został pomyślnie umieszczony na orbicie we wrześniu 1999 roku. Skaner IKONOSA może rejestrować obrazy powierzchni Ziemi z rozdzielczością przestrzenną 1 metra w zakresie panchromatycznym oraz 4 metrów w przypadku rejestracji wielospektralnej, przy zmiennym kącie obserwacji, z możliwością odchylania osi optycznej skanera do 60 stopni od nadiru (w dowolnym kierunku) w celu zwiększenia częstości rejestracji oraz możliwości pozyskiwania obrazów stereoskopowych. Obrazy o wysokiej rozdzielczości dostarczane przez IKONOS będą miały teoretycznie „nieograniczoną” liczbę użytkowników reprezentujących wiele dziedzin takich jak: kartografia, rolnictwo, leśnictwo oraz służb rządowych i samorządowych (administracja rządowa i samorządowa oraz służby ratownicze).Dane z IKONOSA mogą być wykorzystywane zamiast dotychczas stosowanych zdjęć lotniczych do wykonywania oraz późniejszego aktualizowania szczegółowych map całych krajów. Pozwolą one farmerom kontrolować stan zdrowotny upraw oraz szacować zbiory zwiększą dokładnością i w krótszym czasie. Dzięki nim naukowcy będą w stanie badać obszary zagrożone ekologicznie i wyznaczać trendy zmian z większą pewnością. Urzędnicy będą mogli monitorować i lepiej planować gospodarowanie przestrzenią, a urbaniści i planiści- wspierać rozwój budownictwa mieszkaniowego. Krótko mówiąc, gama zastosowań obrazów IKONOSA zależy tylko od wyobraźni.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2000, 10; 67-1-67-11
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the autoregression algorithm for moving objects track prediction
Autorzy:
Szafranek, K.
Szpunar, R.
Powiązania:
https://bibliotekanauki.pl/articles/225198.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
sygnały satelitarne
GPS
systemy satelitarne
satellite signals
satellite system
Źródło:
Reports on Geodesy; 2008, z. 2/85; 139-150
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New satellite navigation systems and moderenization of current systems, why and for whom?
Autorzy:
Januszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/359026.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
GPS system
GLONASS system
Galileo system
satellite block
satellite signals
Opis:
Information about user’s position can be obtained from specialized electronic position-fixing systems, in particular, Satellite Navigation Systems (SNS) as GPS and GLONASS, and Satellite Based Augmentation Systems (SBAS) as EGNOS, WAAS, MSAS. All these systems are known also as GNSS (Global Satellite Navigation System). As the number of GPS and GLONASS satellites visible by the user is sometimes in restricted area not sufficient, and these SNS cannot provide information about integrity, there is one service for civil users only etc., new systems, global as well as regional, must be constructed. The last years gave a rise to many important changes in the operational status and practical exploitation of all these systems. New SNS as Galileo in Europe and Compass (Beidou) in China, new SBAS as GAGAN in India and SDCM in Russia, new regional SNS as IRNSS in India and QZSS in Japan are actually under construction. Additionally the new satellite blocks as GPS IIF and III, and GLONASS K1 and K2, the new signals as GPS L5 and L1C, and GLONASS LC3OC and L1OC, the new services and possible applications of the future system Galileo are presented in this paper.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 58-64
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywność Instytutu Łączności na rzecz rozwoju nowoczesnych systemów i technik satelitarnych
The National Institute of Telecommunications activity for the developement of modern satellite systems and techniques
Autorzy:
Bronk, K.
Marszalec, M.
Lipka, A.
Niski, R.
Powiązania:
https://bibliotekanauki.pl/articles/317636.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
system satelitarny
nawigacja satelitarna
satelita
GNSS
VDES
metrologia czasu
satellite system
satellite navigation
satellite
metrology of time
Opis:
Od momentu przystąpienia Polski do Europejskiej Agencji Kosmicznej, zainteresowanie krajowych firm i instytucji segmentem technik i systemów satelitarnych znacząco wzrosło. W niniejszym artykule opisano działania Instytutu Łączności – Państwowego Instytutu Badawczego (IŁ) na tym polu na przestrzeni kilku ostatnich lat. Poszczególne części publikacji poświęcone są osobnym obszarom tematycznym podejmowanym przez IŁ, w tym: badaniom dostępności sygnałów GNSS na terenie Polski, standaryzacji i rozwojowi nowego systemu łączności na morzu VDES, pracom związanym z opracowaniem koncepcji polskiego satelity AIS/VDES oraz metrologii czasu.
Ever since Poland become a member of the European Space Agency, the involvement of Polish entities in the area of satellites systems and techniques has significantly increased. This article presents the recent activity of National Institute of Telecommunications (NIT) in this field. Every section of the paper is dedicated to a specific topic the NIT dealt with in the last few years, including: the measurements of the GNSS signal availability in Poland, the standardization and analysis of the novel maritime communication system VDES, feasibility study of the Polish AIS/VDES satellite and the metrology of time.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2018, 1-2; 69-90
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air-net of Polish permanent stations RTK DGPS in European CNS/ATM system
Autorzy:
Banaszek, K.
Fellner, A.
Śledziński, J.
Trómiński, P.
Zając, J.
Powiązania:
https://bibliotekanauki.pl/articles/224410.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
systemy nawigacyjne
nawigacja satelitarna
pozycjonowanie satelitarne
DGPS
geodezja satelitarna
navigational systems
satellite navigation
satellite positioning
satellite geodesy
Źródło:
Reports on Geodesy; 2006, z. 1/76; 287-292
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zdjęcia satelitarne SICH-2 - pierwsze analizy
Satellite images sich-2 - first analysis
Autorzy:
Lewiński, S.
Sotnikov, O.
Krupiński, M.
Parshyna, O.
Dąbrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1050725.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
SICH-2
satelita środowiskowy
monitoring satelitarny
MSIIRS
environmental satellite
satellite monitoring
Opis:
Ukraińskie zobrazowania satelitarne pozyskane z satelity Sich-2 są nowymi danymi obrazowymi, dostępnymi w sposób operacyjny od końca 2011 roku. Powierzchnia Ziemi jest obrazowana w pięciu kanałach spektralnych. Pozyskiwane dane charakteryzują się zróżnicowaną rozdzielczością przestrzenną. Kanał panchromatyczny, zielony, czerwony i bliskiej podczerwieni (PAN, G, R, NIR) cechuje się rozdzielczością przestrzenną wynoszącą 8.2 m (nadir), natomiast rozdzielczość przestrzenna zakresu średniej podczerwieni (MIR) jest zdecydowanie mniejsza i wynosi 41.4 m (nadir). Zobrazowania Sich - 2, pod względem rozdzielczości przestrzennej, są zbliżone do danych obrazowych pochodzących z RapidEye, Formosat-2 i SPOT-5. Natomiast pod względem spektralnym odpowiadają zdjęciom SPOT-5. W artykule przedstawione są podstawowe parametry zobrazowań Sich-2 a także podane zostały przykłady wykorzystania ich w teledetekcyjnych badaniach powierzchni Ziemi. Są to wyniki prac prowadzonych przez firmę Dniprocosmos S.C., która specjalizuje się w teledetekcji satelitarnej oraz jest dystrybutorem zdjęć satelitarnych. Zespół Obserwacji Ziemi w Centrum Badań Kosmicznych PAN pozyskało raz przeanalizował jedno z pierwszych zdjęć Sich-2 obrazujących obszar Polski. Na podstawie sceny obejmującej obszar okolic Lublina wykonano m.in. ocenę możliwości interpretacyjnych. W siedmiostopniowej skali MSIIRS (Multispectral Imagery Interpretability Rating Scale) analizowane zobrazowanie zakwalifikowano na poziomie 3.
Ukrainian-Russian carrier rocket Dnepr, that was launched on August 17, 2011 from the Baikonur Dombarowskij in Russia, has placed in orbit the Sich-2 satellite. It is a satellite dedicated to Earth observation, designed and manufactured by the Ukrainian space industry. Sich-2 is a continuation of the mission Sich-1, Okean-O and Sich-1M. According to the Ukrainian National Space Policy the Sich-2 gives rise to a constellation of modern micro-satellites. They are designed to collect imagery of the Earth surface in the visible and near-infrared radiation with a spatial resolution of: 8 m (Sich-2, Sich-2M), 1 m (Sich-3-O) and the 1 m radar images (Sich-3-R). Satellites are characterized by high sophistication in terms of electronic and polymeric and composite materials used during the construction. Installed devices are designed to work under the "open" space and do not require special protection in the form of sealed enclosures. Sich-2 satellite operates at a 700 km altitude on the Sun synchronous orbit and having the inclination of 98.24°. The image data are collected in four spectral bands, with a spatial resolution of 8.2 m (PAN, R, G, B) and 41.4 m in the mid-infrared (MIR). The optical system provides the ability to change viewing angle from nadir up to 30°. Width of the panchromatic and multispectral scene is 48 km (at nadir) and 58 km for the MIR scanner. The article demonstrates the possibility of using the new Ukrainian satellite images acquired from the Sich-2, which, due to the spatial resolution are similar to the image data from FORMOSAT-2, SPOT-5 and RapidEye. Examples of using Sich-2 for monitoring of vegetation in built-up areas, monitoring of natural disasters (floods, snow drifts, fires) and classification of agricultural areas are presented. These are the results of work carried out by the company Dniprocosmos S.C., which specializes in satellite image processing and is a distributor of satellite data. The team of the Earth Observation Group from the Space Research Centre of the Polish Academy of Sciences acquired one of the first images from the Sich-2, that captured Polish territory. Based on a scene depicting the area around Lublin, in March 2012, analysis of interpretation possibilities were performed. It was done using the MSIIRS (Multispectral Imagery Interpretability Rating Scale) interpretation system. The Sich-2 image was classified at level 3 of eight-point scale.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2012, 24; 177-186
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing real-time GNSS data streams for supplying the GOP Data Center
Autorzy:
Douša, J.
Bartošová, P.
Powiązania:
https://bibliotekanauki.pl/articles/225092.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
system nawigacji satelitarnej
nawigacja satelitarna
GNSS
satellite navigation system
satellite navigation
Źródło:
Reports on Geodesy; 2008, z. 1/84; 35-40
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardware and Software Complex for Laboratory of Satellite Technologies
Autorzy:
Kharchenko, Volodymyr
Konin, Valeriy
Pogurelskiy, Oleksiy
Powiązania:
https://bibliotekanauki.pl/articles/504541.pdf
Data publikacji:
2020
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
satellite technologies
laboratory
GNSS
Opis:
Satellite technologies of communication, navigation and surveillance play an important role in modern transport, and particularly in aviation. High effectiveness of global air navigation system is provided by applying data broadcasted from great numbers of satellites, located on Earth orbits. The totality of existing satellite navigation system forms global radio navigation field which parameters should be constantly monitored and controlled for providing safety requirements. The aim of this article is to share experience of creating a laboratory of satellite technologies at the National Aviation University that performs simultaneously educational and scientific tasks.
Źródło:
Logistics and Transport; 2020, 45-46, 1-2; 95-102
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zdjęcia LISS-III indyjskiego satelity IRS-1C
Autorzy:
Lewiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/129925.pdf
Data publikacji:
1999
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
satelita indyjski
indian satellite
Opis:
Indyjski satelita IRS-1C (Indian Remote Sensing Satellite) rejestruje obrazy powierzchni Ziemi od stycznia 1996r. Mimo upływu ponad 3 lat, zdjęcia pochodzące z jego pokładu nie są jeszcze powszechnie znane i wykorzystywane w naszym kraju. IRS-1C należy do serii satelitów środowiskowych. Wyposażony jest w trzy skanery rejestrujące obraz powierzchni Ziemi. Skaner panchromatyczny PAN, multispektralny LISS-III (Linear Imaging and Self Scanning Sensor) oraz skaner bliskiej podczerwieni WiFS (Wide Field Sensor). Celem referatu jest prezentacja map satelitarnych opracowanych na podstawie zdjęć LISS III w skali 1:100 000 oraz w 1:50 000. Duży stopień szczegółowości obrazu w skali 1:50 000 uzyskano w wyniku połączenia zdjęcia multispektralnego z wysokorozdzielczym zdjęciem panchromatycznym.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 1999, 9; 185-189
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Architecture of positioning and tracking solutions for maritime applications
Autorzy:
Ilcev, S.D.
Powiązania:
https://bibliotekanauki.pl/articles/2211830.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ships tracking
Global Navigation Satellite System
satellite asset tracking
radio frequency
satellite transponder
tracking
positioning
global ship tracking
Opis:
This paper discusses the current and new satellite transponders for global tracking and detecting of oceangoing ships, assets, crew, passengers and any moving objects at sea for enhanced vessels traffic control and management. These transponders are able to monitor all maritime assets and to improve safety, security of movements and collision avoidance, especially during very bad weather conditions and visibility. By deployment of the Global Navigation Satellite System (GNSS) in integration with Inmarsat, Iridium and other satellite systems in one unit with antenna, it is possible to provide reliable positioning and tracking solutions for civilian maritime, other mobiles and personnel at different Radio Frequency (RF) bands. The existing and forthcoming space and ground segment for positioning and tracking solutions as a modern Satellite Asset Tracking (SAT) onboard ships, and other relating systems are discussed and benefits of these new technologies and solution for improved positioning and tracking are explored.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 3; 481--489
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploitative Properties of Different Types of Satellite Compasses
Autorzy:
Felski, A.
Powiązania:
https://bibliotekanauki.pl/articles/320807.pdf
Data publikacji:
2010
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
GPS
satellite compass
errors
Opis:
Satellite compass is the specific, multiantenna receiver of the satellite navigation system which, apart from the standard functions, like position, time, Course and Velocity etc. enable to measure the angles of the orientation of the ship's hull. The most popular solution is two-antenna solution, which gives opportunity to measure two angles: heading and pitch or roll. However, three antenna solutions are accessible as well (www.furuno.co.jp). In this option the device can measure full information about space orientation of the object. Discussed devices has common name 'compass' although they are still not officially confirmed in this role and according IMO's resolutions they can be used only as auxiliary source of information and is classified as Heading Transmitting Devices (MSC.116). The origin of satellite compasses we can find in interferometry used in astronomy since sixties, however the present solutions in fact are adopted from Real Time Kinematic variant of GPS technology (Felski 1999). Nonetheless products accessible on the shelf are very diverse in construction, electronics and software so in practice of their exploitation very different proprieties could be observed. In the report the practical experiences with the use of two different types of satellite compasses are presented, as well as the analysis of observed errors. It turned out that the behavior of satellite compass is not comparable to any gyro or magnetic compasses which are in fact something natural. In fact signal from satellite compass has three kinds of errors: first one is small noise with amplitude of same arc-minutes which is natural in any electronic devices, the second one is long-term changes which are seems be dependent on satellite constellation configuration and finally short, big changes correlated with transition period when new configuration of satellites is catches-on. According to the observations very important are solutions assumed in electronics and software, because observations confirm that two different constructions characterize themselves with very different proprieties.
Źródło:
Annual of Navigation; 2010, 16; 33-40
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time satellite levelling of linear structures
Autorzy:
Uznański, A.
Powiązania:
https://bibliotekanauki.pl/articles/225386.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
pomiary satelitarne
satellite measurements
Opis:
Providing the users in Poland with the ASG-EUPOS system in the mid-2008 has significantly influenced the popularization of satellite survey techniques, especially realtime surveys. Real-time satellite levelling has become a very effective way of determining normal heights of points. The paper discusses the problem of satellite levelling carried out for linear structures using, the most popular among the users, Real Time Network surveys referring to the ASG-EUPOS system, as well as RTK GPS surveys carried out in relation to a physical reference station. The conclusions regarding the possibility of applying satellite levelling in real time on railway areas were based on the surveys of several sections of a railway line, for which geodetic precise leveling was also conducted.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 507-514
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiana zasięgu lodowca Vatnajökull na Islandii w latach 1991-1999 na podstawie obrazów satelitarnych wykonanych przez satelitę Landsat
Changes in range of Vatnajökull icecap (Iceland), based on Landsat imagery, 1991-1999
Autorzy:
Górzyńska, M.
Powiązania:
https://bibliotekanauki.pl/articles/132397.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
lodowiec
zdjęcie satelitarne
satelita Landsat
Islandia
satellite image
Landsat satellite
icecap
Iceland
Źródło:
Teledetekcja Środowiska; 2008, 40; 85-99
1644-6380
Pojawia się w:
Teledetekcja Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satellite and Terrestrial Radionavigation Systems on European Inland Waterways
Autorzy:
Januszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/116145.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Inland Waterways
Inland Navigation
Satellite Radionavigation System
Terrestrial Radionavigation system
satellite navigation system
Radionavigation
satellite based augmentation system (SBAS)
EGNOS
Opis:
The usefulness for all sea users of Satellite Navigation Systems (SNS), Satellite Based Augmentation Systems (SBAS) and Automatic Identification System (AIS) is well known. The possibility, actual and future, of the utilization of all these systems on European inland waterways, GPS augmented by IALA DGPS reference stations, GPS augmented by European SBAS – EGNOS from direct Signal–in–Space (SIS) and GPS augmented by EGNOS from re–transmission over AIS, is presented in this paper. The operational systems, such as the German network IALA DGPS and DoRIS, and planned system such as GALEWAT, MARGAL, MUTIS and MARUSE are described also.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 2; 121-126
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global Navigation Satellite Systems – Perspectives on Development and Threats to System Operation
Autorzy:
Czaplewski, K.
Goward, D.
Powiązania:
https://bibliotekanauki.pl/articles/117128.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
Global Positioning System (GPS)
satellite navigation
satellite navigation and timing technology
e-Loran
GLONASS
BeiDo
EGNOS
Opis:
The rapid development of satellite navigation and timing technologies and the broad availability of user equipment and applications has dramatically changed the world over the last 20 years. It took 38 years from the launch of the world’s first artificial satellite, Sputnik 1, (October 4, 1957) to the day NAVSTAR GPS became fully operational (July 17, 1995). In the next 20 years user equipment became widely available at the consumer level, and 10 global and regional satellite systems were partially or fully deployed. These highly precise signals provided free to the user have been incorporated by clever engineers into virtually every technology. At the same time interference with these signals (spoofing and jamming) have become a significant day to day problem in many societies and pose a significant threat to critical infrastructure. This paper provides information on the current status and development of navigation satellite systems based on data provided by the systems' administrators. It also provides information on Loran/eLoran, a system which many nations have selected as a complement and backup for satellite navigation systems.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 183-192
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Results of a research predicting the position of an aircraft during approach and landing using the Bessel function
Autorzy:
Grzegorzewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/279555.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
satellite technology
aviation
predication position
Opis:
The article presents theoretical foundations of the position prediction functionality of a GPS receiver to be used by a pilot in the event of an instantaneous lack of position data occurring due to various reasons.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 915-926
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attempt to apply methods of analysis of satellite images and elevation models for regionalization and valorization (case study of Nigeria)
Autorzy:
Nita, J.
Myga-Piątek, U.
Powiązania:
https://bibliotekanauki.pl/articles/87857.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
regionalization
valorization
satellite images
Nigeria
Opis:
The aim of the presentation is an attempt of a new approach to the matters of regionalization of geographical space and valorization of scenic units made from the outside reference point (in the orthogonal grid). Such an opportunity to take a look from another perspective is given by analysis of aerial and satellite photos, and DTM. Regardless of the adopted way of perceiving the landscape: either as a peculiar spatial structural-material unit (an approach typical of natural sciences), or a physiognomic approach (typical of humanist and technical sciences), the landscape requires appropriate categorization and evaluation. The presentation shows methods which allow for multi-criterion evaluation of spatial units, and then basing on this, suggest possibilities of new spatial divisions. From the point of view of analysis of Sat images and DTM, the most important methods include: Cartographic methods, like: bonitation method, matrix method of determining landscape value, landscape model as surface features, method of determining boundaries and ranges of scenic units, their features, intensity, needs, significance, relations, etc., method of cartometric determination of outlines of objects (scenic units) as basic fields of evaluation – determination of shape and size; Terrain methods used mainly in landscape architecture, like: method of scenic interiors and units, method of impression curve by Wejchert, method of rural landscape classification by Sóhngen, “photographic” method by Cymerman and Hopper, Methods of landscape evaluation based on the infrastructure value (landscape as an element of the cultural-architectonical value) e.g. evaluation and valorization of landscape by means of assessing the value of object included in it, e.g. property, building structures, monuments; Methods of functional evaluation e.g. agricultural, forest, urban, etc.; Methods of evaluation of the photo-tonal value (colour range); Methods of landscape evaluation by means of selected statistical parameters (e.g.) basing on provisions of the fuzzy set theory for the value of space represented by the open space index, characterized by parameters of descriptive statistics. These methods will be presented using several examples of open space value estimation procedures in LandSat photos and DEM models from the region of Nigeria. The presentation will continue with selected methods being used for identifycation and determination of the range of uniform scenic value zones and transitional zones. Cartometric extractions of outlines of scenic units as basic fields of evaluation will be shown, types of landscape discussed and basic statistics describing its structure presented. The authors will also refer to the issues of limits of landscape use and their practical meaning, e.g. in tourist terms. At attempt of classification and valorization of separated fields has been presented, along with estimation of the level of their uniformity, rank and usability.
Źródło:
Prace Komisji Krajobrazu Kulturowego; 2008, 8; 173-182
1896-1460
2391-5293
Pojawia się w:
Prace Komisji Krajobrazu Kulturowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Łączność satelitarna we współczesnych operacjach wsparcia pokoju
Satellite communications in contemporary peace support operations
Autorzy:
Marczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/120015.pdf
Data publikacji:
2013
Wydawca:
Akademia Sztuki Wojennej
Tematy:
satellite systems
satellite communications
peace support operations
systemy satelitarne
komunikacja satelitarna
operacje pokojowe
Opis:
Gulf War and the conflicts in Iraq and Afghanistan clearly confirmed, and confirm the importance in today's modern battlefield command and communications systems. An important role in these conflicts from the first day played a satellite communications. Today, peace support operations conducted and Polish involvement in such activities, promote the development of satellite systems in the Armed Force s. Polish military units in Afghanistan, using NATO satellite systems and use their own satellite communications as the main means of communication and the way in the field of activities. Recently, the equipment units entered the army command mobile satellite terminals tactical level. The fight against asymmetric satellite communications is the primary method of exchanging information and command of military contingent. Other systems, such as radio are reserve funds, used an ad hoc basis, at lower levels of command or during patrol operations as a link in the column. The author wishes to bring in the paper the development of military satellite systems and the possibility of Polish detachments in the tasks with the use of satellite imagery. The analysis has been especially satellite systems in the recently concluded operations in Iraq and operations in Afghanistan, and the ability to land forces component of current and future activities in the international arena. Military communications satellites to be constantly adjusted to meet the growing challenges and needs in the number of calls made. The use of modern technology and services of satellite systems have to bring our troops and units of the tactical level activities NCW (Network Centric Warfare) environment. The development of space technology is not standing still. The world is planning new programs and further development of space stations, plans to build a base on the moon, build colonies in space and of course development of military satellite communications systems. Space has become a challenge for the twenty first century man.
Źródło:
Zeszyty Naukowe AON; 2013, 2(91); 90-101
0867-2245
Pojawia się w:
Zeszyty Naukowe AON
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiences of RTK positioning in hard observational conditions during Nysa Kłodzka river project
Autorzy:
Bakuła, M.
Oszczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/224504.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
RTK
pozycjonowanie satelitarne
geodezja satelitarna
GPS
system pozycjonowania obiektów
satellite positioning
satellite geodesy
Opis:
The paper presents the application of RTK technology for measuring the horizontal and vertical cross-sections of the Nysa Kłodzka River located in the southern part of Poland. GPS measurements were performed by the staff of Chair of Satellite Geodesy and Navigation of University of Warmia and Mazury in Olsztyn in cooperation with the team of the OPeGieKa Wroclaw company. The measurements had been done for 30 days during August and September 2004. Three GPS receivers were used such as two Ashtech Z-Xtreme and one Ashtech Z-Surveyor. The radiomodems Satelline of SATEL company were used for transmitting RTK corrections from a reference station to rovers. RTK measurements were being performed in very difticult observational conditions Iike in heavy shrubbery or under trees. It was excellent occasion to test reliability and accuracy of RTK positioning in practice. In general, the use of RTK technology in woodlands and rural terrain extremely improved efficiency of works, but gross errors were being occurred from time to time in very severe conditions of GPS observations due to the lack of good satellite geometry and availability.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 71-79
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Navigation for Satellite Formation Flying
Autorzy:
Głębocki, R.
Jacewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/403438.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
satellite
vision navigation
autonomous docking
Opis:
This paper deals with the case of a target satellite in an unknown orientation and location with respect to the master satellite. Feature based monocular pose estimation vision system was presented. The results of analysis, implementation and testing of simulation intended for vision-based navigation applications such as rendezvous of satellites and formation flying are shown. The mobile robot was used as the platform for the vision system. Pose estimation algorithms were implemented in Matlab environment. It was obtained that the proposed method is robust on varying and low light conditions.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2018, 9, 2 (32); 9-26
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Meteorological Phenomena on Modern Satellite Systems
Autorzy:
Bogucki, J.
Jarkowski, J.
Wielowieyska, E.
Powiązania:
https://bibliotekanauki.pl/articles/308167.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
millimeter waves
propagation
satellite link
Opis:
The areas of attention, described in this paper, extend throughout the modern satellite systems. Future satellite systems are to be planned for the millimeter band, which has greater weather attenuation effects than until now used bands. This paper provides a brief overview of propagation factors on millimeter-band earth-satellite paths and requirements in relation to the need for specific types of propagation data.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 88-94
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capabilities of subsidence detection on mining areas in Upper Silesian Coal Basin using Sentinel-1A data acquired in Interferometric Wide Swath Mode
Autorzy:
Malik, H.
Powiązania:
https://bibliotekanauki.pl/articles/184508.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
earth surface
monitoring
satellite radar
Opis:
Monitoring of the Earth Surface using SAR satellite radar is an increasingly used tool in case of natural and anthropological hazards (Perski 1999). Differential Interferometry SAR (DInSAR) and Persistent Scatterer Interferometry SAR (PSInSAR) are satellite SAR radar interferometry methods. These are well-known and widely used tools for detecting ground deformation (Porzycka & Leśniak 2010). New generation of SAR antennas provide the imagery with sub-meter resolution. It allows for computing very accurate interferograms capable for slow and dynamic subsidence detection over even small areas. These properties of SAR technology are very important in case of heavily populated mining regions, where comes to damage to residential buildings (Mirek 2012). Studies presented in this paper refer to the Upper Silesian Coal Basin (South Poland), which is vulnerable to the subsidence phenomenon. The aim of this study was to determine the applicability of the interferometric analysis of different zones in Upper Silesian Coal Basin. In this area subsidence occurs at different rates and can be divided into slow displacement with wide range and dynamic subsidence of small areas. In the described work the analysis of ground deformation was performed using Sentinel-1A data acquired in Interferometric Wide Swath Mode (IWS) with 12 days revisit and 5 × 20 meters ground resolution. Free and open access to Sentinel-1 satellite data are granted for the Copernicus programme. It is focused on global coverage and quick data delivery (ESA website). The obtained results show the capabilities and limitations of this technology in case of vertical ground deformation velocity compared to its range. The relationship between the spatial resolution of the imagery and the dynamics of subsidence was presented. Finally the possibility of using PSInSAR method with Sentinel-1A data was presented (Strzelczyk & Porzycka-Strzelczyk 2014).
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 94
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The complex use to the satellite and GIS-technologies in submarine navigation
Autorzy:
Katenin, V. A.
Katenin, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/320839.pdf
Data publikacji:
2000
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
satelita
GIS
navigation
satellite
Opis:
Some specific method and software of using the satellite and GIS technologies is presented in the paper.
Źródło:
Annual of Navigation; 2000, 2; 69-79
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of Polish R&D industry in the context of prototyping, design, development and control of a dedicated national satellite SAR system for marine ecosystem monitoring Technical paper - preliminary study
Autorzy:
Chybicki, A.
Łubniewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/332762.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
SAR
satellite
system
observations
maritime
Opis:
Space technology is currently one of the most important elements in the advance of information societies and knowledge-based economies all over the world. The European Space Agency (ESA) is in the focal point of European space activities, while the European Union provides strong financial support for the development of space technologies and applications in its flagship programs. In a domestic scope, the Polish Space Agency (POLSA) is a national aeronautics entity responsible for activities related to development of technologies of the national space sector. Recently, one of the activities which POLSA aims to establish, is the programme of building a system of satellite SAR observations dedicated for Polish users; such as administration, civilian services, and Polish scientific and research entities, that would expand potential use of satellite technologies among numerous Polish beneficiaries. In the context mentioned above, the paper describes the architecture and functional components of an exemplary satellite SAR system, along with the potential of Polish entities to develop such technology.
Źródło:
Hydroacoustics; 2016, 19; 49-54
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of satellite data in the operational 3D coupled ecosystem model of the Baltic Sea (3D CEMBS)
Autorzy:
Nowicki, A.
Janecki, M.
Darecki, M.
Piotrowski, P.
Dzierzbicka-Głowacka, L.
Powiązania:
https://bibliotekanauki.pl/articles/260554.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Baltic
ecosystem
model
satellite
assimilation
Opis:
The objective of this paper is to present an automatic monitoring system for the 3D CEMBS model in the operational version. This predictive, eco hydrodynamic model is used as a tool to control the conditions and bio productivity of the Baltic sea environment and to forecast physical and ecological changes in the studied basin. Satellite-measured data assimilation is used to constrain the model and achieve higher accuracy of its results. 3D CEMBS is a version of the Community Earth System Model, adapted for the Baltic Sea. It consists of coupled ocean and ice models, working in active mode together with the ecosystem module. Atmospheric forecast from the UM model (Interdisciplinary Centre for Mathematical and Computational Modelling of the Warsaw University) are used as a forcing fields feed through atmospheric data model. In addition, river inflow of freshwater and nutrient deposition from 71 main rivers is processed by land model. At present, satellite data from AQUA MODIS, processed by the SatBałtyk project Operational System are used for the assimilation of sea surface temperature and chlorophyll a concentration. In the operational mode, 48-hour forecasts are produced at six-hour intervals, providing a wide range of hydrodynamic and biochemical parameters.
Źródło:
Polish Maritime Research; 2016, 1; 20-24
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of studies of the monitoring for aircraft and vehicles based on GNSS
Autorzy:
Ćwiklak, J.
Jafernik, H.
Śledziński, J.
Powiązania:
https://bibliotekanauki.pl/articles/224861.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
nawigacja satelitarna
GNSS
satellite navigation
Opis:
Presently a lot of countries carry out aviation tests of Automatic Dependent Surveillance - Broadcast ADB-S). The on-board GPS receiver is used as a basic source of information on position and time for that system. According to the CNS/ATM plan, traditional radars using by ATC will be replaced for ADB-S in the near future. One the vital elements of the system is Global Navigational Satellite System (GNSS). According to the project a research team is going to work out an aviation tracking system for control an air traffic and ground movement in the border area. Moreover, the team will examine the system in the areas of accuracy, range of tracking and reliability as well. The proposed system consists of three basic components: the positioning, airborne GNSS receivers, the transmission of data and the ground station. The research plan is carried out taking into account a variety of air operations, such as a takeoff, a route on a low height, approaching and landing. The idea of monitoring system for aircraft using satellite navigation systems is in line witch the concept of the use of GNSS in aviation, both in Europe and worldwide.
Źródło:
Reports on Geodesy; 2011, z. 2/91; 109-119
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cultural Landscape, Floods and Remote Sensing
Autorzy:
Húska, D.
Jurík, L.
Tátošová, L.
Šinka, K.
Jakabovičová, J.
Powiązania:
https://bibliotekanauki.pl/articles/123324.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
drainage
flood
landscape
river
satellite
Opis:
The dynamics of the cultural landscape is associated with the penetration of people into the natural landscape, the settling and adaptation to the needs of the society and its development. Climate creates the decisive influence, specifically the form of extremely high rainfall causing flooding. Adverse impact on the cultural agricultural landscape is mainly the submersion time. This time depends on the configuration of the terrain, its disposition and the existing drainage ditches in the area, ensuring the drainage of the flood to the recipients. Long-lasting floods have stipulated taking measures for the protection of the area from flooding by building dikes and drainage of the flood from the area. Identifying the extent of extreme floods and zones of permanent waterlogging is currently provided by modern technology which allows recording satellite images in different spectral bands. Within the basic distinguishing signs mainly accruing is used and it is possible to track changes of the extent of flooded areas and thus identify problem areas insufficiently protected against long-term flooding. Consequently, it is possible to solve the concept of exploiting such areas to keep them in the structure of PPF or their reclassification in wetland systems with necessary legislative security. The aim of this paper is to show the possibility of using satellite images in identifying the extent of flooding.
Źródło:
Journal of Ecological Engineering; 2017, 18, 3; 31-36
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The implementation of the EGNOS system to APV
Autorzy:
Fellner, A.
Banaszek, K.
Trómiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/225090.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
system nawigacji satelitarnej
nawigacja satelitarna
ruch lotniczy
satellite navigation system
satellite navigation
air traffic
Źródło:
Reports on Geodesy; 2008, z. 1/84; 31-34
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja nieużytków porolnych i odłogów na obrazach satelity TERRA-ASTER
Identification of fallow fields using TERRA-ASTER data
Autorzy:
Piekarczyk, J.
Królewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/132393.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
nieużytki
odłogi
obraz satelitarny
satelita TERRA ASTER
fallow fields
satellite image
TERRA ASTER satellite
Źródło:
Teledetekcja Środowiska; 2008, 39; 103-110
1644-6380
Pojawia się w:
Teledetekcja Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of satellite techniques in geodesy and navigation in Poland
Autorzy:
Baran, Lubomir W.
Oszczak, Stanisław
Zieliński, Janusz B.
Powiązania:
https://bibliotekanauki.pl/articles/703201.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geodesy
reference frame
Global Positioning System – GPS
satellite techniques
satellite navigation
Galileo navigation system
Opis:
Contemporary geodesy is of global dimension. The reference frame is defined as the geocentric system with parameters related to the entire Earth body, e.g. the axis of rotation, and global geoid. The unified time scale is determined for the whole Earth territory as well. International services using different satellite techniques are engaged in the determination of this frame. Particularly important is the Global Positioning System GPS, which is the most important geodetic tool nowadays. In Poland a number of geodetic observatories are working in the frame of the international networks, Polish scientific groups contribute to the advancement of science in this domain. For the practical applications we are using the local networks that again are constructed with satellite techniques. In Europe the regional network EUREF exists while its part EUREF-POL and densification POLREF are in Poland. The modern network ASG-EUPOS is under construction. The GPS technique is used for surveying and navigation and for the positioning in motion, which is in-between the preceding traditional methods. Differential augmentation methods are designed to improve GPS signals such as DGPS and EGNOS. The new European satellite navigation system Galileo is in development. Poland is a member and coowner of this system. A number of Polish research institutions are working on new methods of the practical application of GNSS.
Źródło:
Nauka; 2008, 4
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Attempt to Use Google Earth Pro Images for Selected Geodetic Works − for Example of Wolności Square in Poznań (Poland)
Autorzy:
Kubiak, Jarosław
Magda, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/43347428.pdf
Data publikacji:
2020-12-15
Wydawca:
Poznańskie Towarzystwo Przyjaciół Nauk
Tematy:
Global Navigation Satellite Systems
Google Earth Pro maps
Topographic Objects Database
topographic descriptions
satellite measurement
Opis:
The article concerns issues pertaining to satellite geodesy and the possibilities of using the available source materials such as high-resolution satellite maps for selected works which require a high degree of accuracy in determining the location of topographic objects. The purpose of the work was to indicate the potential use of Google Earth maps for selected geodetic works (preparing topographic descriptions, sketch maps) in order to facilitate and accelerate the process. Works were carried out in an urban area, Wolności Square in Poznań (Poland) where 58 checkpoints were located. In order to design them, maps from the Google system from four periods were used. The research used the Global Navigation Satellite Systems set consisting of a Leica GS08 + satellite receiver and a Leica CS15 controller, geodetic software for work design (Trimble GNSS Planning Online) and calculations (C-Geo 8) as well as cartographic materials and data obtained from the Municipal Center of Geodetic and Cartographic Documentation in Poznań: the master map, catalog data and topographic descriptions of the reference points. The results show that the accuracy of the location of points offered by Google is greater than declared by the system operators. However, it is not sufficient for applications in the assumed geodetic works.
Źródło:
Badania Fizjograficzne Seria A - Geografia Fizyczna; 2020, 11 (71); 65-74
2081-6014
Pojawia się w:
Badania Fizjograficzne Seria A - Geografia Fizyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Satellite Navigation Techniques for Vessel’s Drift Determination in Piloting Areas
Autorzy:
Blokus-Roszkowska, A.
Jurdziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/117034.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Satellite Navigation Technics
Global Navigation Satellite System (GNSS)
Pilot Navigation
Piloting Area
Vessel's Drift
satellite navigation system
Ship Control System
Global Positioning System GPS
Opis:
The paper deals with use the satellite navigation system for increase safety of navigation in difficult areas. There have been presented an algorithm to ship control procedure during environmental disturbances in narrow passages.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 3; 389-392
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GOVSATCOM makes EU stronger on security and defence
Autorzy:
Borek, Rafał
Hopej, Kaja
Chodosiewicz, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/576417.pdf
Data publikacji:
2020-03-17
Wydawca:
Akademia Sztuki Wojennej
Tematy:
European Union
satellite communication
national security
Opis:
Publication identifies the meaning of Governmental Satellite Communication Govsatcom and presents a hypothesis related to the demand for this type of satellite communication. It describes engagement of main involved institutions i.e. European Space Agency, European Defence Agency, and European Commission, especially elaborating the PACIS projects running under ESA umbrella, which are one of the main preparatory actions for the IV EU Space Program. The theoretical research methods employed in this study are: synthesis, analysis, abstracting and generalization. It updates information about whole activites, which have taken place since the decision about its establishement. Describing preparatory actions and EU institutions involved. Moreover considers about future relations between related parties and possible Poland's engagement explaining what kind of benefits it would deliver. The conclusion is that the future EU space program creates proper environment for cooperation between community members and deliver opportunity to use safe and secure satellite communication for members who cannot afford possess own capabilities.
Źródło:
Security and Defence Quarterly; 2020, 28, 1; 44-53
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trasy nachylone w zakresie fal milimetrowych
Design of slant paths in millimetre band
Autorzy:
Bogucki, J.
Powiązania:
https://bibliotekanauki.pl/articles/317534.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
telekomunikacja
łączność satelitarna
propagacja
satellite
propagation
Opis:
Wskazano sposób projektowania tras nachylonych, czyli satelitarnych, w zakresie fal milimetrowych. Podano równanie radiokomunikacyjne łącza satelitarnego oraz podstawowe parametry satelity telekomunikacyjnego. Zamieszczono zależności matematyczne do precyzyjnego projektowania tras satelitarnych, pracujących w zakresie częstotliwości większych niż 18 GHz.
The paper describes all-important methodical problems related to design of slant paths in millimetre band satellite systems. The article presents the downlink equation and basic satellite parameters. Moreover, the equation allows to design slant paths in the frequency range above 18 GHz.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2003, 3-4; 66-92
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visibility and geometry of GPS and GLONASS
Autorzy:
Januszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/320787.pdf
Data publikacji:
1999
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
satelitarne systemy nawigacyjne
satellite navigation systems
Opis:
Actually there are two world-wide satellite navigation systems - American GPS and Russian GLONASS. Distribution (%) of numbers of visible satellites and distribution (%) of GDOP (Geometric Dilution Of Precision) coefficient values for the observer at different latitude for different masking elevation angle for both systems are demonstrated in this paper.
Źródło:
Annual of Navigation; 1999, 1; 55-65
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications
Autorzy:
Śliwiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/258478.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
volumetric losses
satellite pump
water
oil
Opis:
In this paper, volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper, the sources of volumetric losses in this pump are characterized. On this basis, a mathematical model of these losses has been presented. The results of the calculation of volumetric losses according to the model are compared with the results of the experiment. Experimental studies have shown that the volumetric losses in the water pump are even 3.2 times greater than the volumetric losses in the oil pump. It has been demonstrated that the mathematical model describing the volumetric losses both in the water pump and in the oil pump is quite good. It has been found that the results from the loaded pump simulation (at Δp=25MPa and ant n=1500rpm) differ from the results of the experiment by no more than 5% both for oil and water.
Źródło:
Polish Maritime Research; 2019, 2; 173-182
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water and mineral oil on volumetric losses in a hydraulic motor
Autorzy:
Śliwiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/259780.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
volumetric losses
satellite motor
water
oil
Opis:
In this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquids, including water. The sources of leaks in this motor are also characterized and described. On this basis, a mathematical model of volumetric losses and model of effective rotational speed have been developed and presented. The results of calculation of volumetric losses according to the model are compared with the results of experiment. It was found that the difference is not more than 20%. Furthermore, it has been demonstrated that this model well describes in both the volumetric losses in the motor supplied with water and oil. Experimental studies have shown that the volumetric losses in the motor supplied with water are even three times greater than the volumetric losses in the motor supplied with oil. It has been shown, that in a small constant stream of water the speed of the motor is reduced even by half in comparison of speed of motor supplied with the same stream of oil.
Źródło:
Polish Maritime Research; 2017, S 1; 213-223
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water and mineral oil on mechanical losses in the displacement pump for offshore and marine applications
Autorzy:
Śliwiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/260207.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
mechanical losses
satellite pump
water
oil
Opis:
In this paper mechanical losses in a positive displacement pump supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted by using a prototype satellite pump of a special design. The design of the satellite pump is presented in the article. The pump features and a non-circular tooth working mechanism was developed to work with both water and mineral oil. The sources of mechanical losses in such pump are also characterized in this paper. On this basis, a mathematical model of the losses has been developed and presented. The results of the calculation of mechanical losses according to the model are compared with the results of the experiment. The experimental studies have shown that the mechanical losses in the water pump are even 2.8 times greater than those in the oil pump. It has been demonstrated that the mathematical model well describes the mechanical losses both in the water pump and the oil pump. It has been found that the results from the loaded pump simulation (at Δp=25MPa) differ from the results of the experiment by no more than 5% both for oil and water.
Źródło:
Polish Maritime Research; 2018, S 1; 178-188
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control and reconfiguration of satellite formations by electromagnetic forces
Autorzy:
Wawrzaszek, R.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/307632.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
electromagnetic formation flight (EMFF)
satellite formations
Opis:
Current concept of interferometric missions assume that they employ formations of spacecraft. The cooperation between members of a multisatellite formation is a challenging problem. One of the main difficulties is to implement a reliable system for position control and actuation. A precise control of the position and orientation of each satellite in the array is a key factor in obtaining high quality images of distant objects. The controlling system should frequently collect data about geometry and kinematics of all array elements and use actuators to keep them as close as possible to their nominal positions. Forces that are required for actuation or array reconfiguration in space can be produced by engines of various types. In most cases chemical propulsion is used, with a drawback of limited fuel resources and a danger of polluting optical elements. In our work, we analyze dynamics of satellite formation flight, in which interaction forces result from electromagnetic fields generated by coils with current. We use simple controller equation proposed by members of MIT team to control a formation of two or three aligned satellites rotating around the array's mass center.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 54-58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologies for low cost small satellites
Autorzy:
Kurek, K.
Powiązania:
https://bibliotekanauki.pl/articles/307636.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
small satellites
satellite systems
space technology
Opis:
Paper presents short description of satellite struc- ture and characterization of its subsystems. Review of tech- nologies used in small satellite missions is presented, consid- ering possible solutions in low cost projects. Three common solutions: the use of commercial off the shelf (COTS) compo- nents, miniaturization, remote testing and integration of sub- systems can be used to significantly reduce cost of the satellite.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 45-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The applications of GNSS systems in logistics
Autorzy:
Maciuk, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/391167.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
transport
logistics
satellite systems
GPS
GNSS
Opis:
The development of navigation satellite systems allows them to be used in many areas of trade, services and industry. This development is strongly visible in industries related to logistics and transportation where car navigation is becoming a standard for all kinds of vehicles. In this paper the author discusses navigation satellite systems, the principle of their operation and presents analysis of possible applications in businesses related to logistics and transport.
Źródło:
Budownictwo i Architektura; 2018, 17, 3; 181-188
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the EGNOS/GNSS parameters in selected aspects of Polish transport
Analiza parametrów systemu EGNOS/GNSS w wybranych aspektach Polskiego transportu
Autorzy:
Fellner, R.
Powiązania:
https://bibliotekanauki.pl/articles/374081.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
EGNOS
satellite systems
transport
systemy satelitarne
Opis:
The transport sector requires efficient and accurate traffic management systems in airspace, on land and at sea. European Geostationary Navigation Overlay Service (EGNOS) may be part of these systems. However admission to its use in Poland requires analysis whether it fulfil international standards. This paper presents such verification of the EGNOS usefulness for: air, sea, road and rail Polish transport. Therefore, conducted a characterization and analysis of four parameters of the signal (accuracy, integrity, continuity and availability) based on data from the EGNOS Data Collection Network in the years 2011-2012. Monitored parameters were compared with current international requirements for the signals of satellite systems in force in the various types of transport. This allowed to determine whether the EGNOS system can be used in them.
Sektor transportu wymaga efektywnych i dokładnych systemów zarządzania ruchem w przestrzeni powietrznej, na lądzie i morzu. Europejski Satelitarny System Wspomagania (EGNOS) może być ich częścią. Jednak dopuszczenie do jego wykorzystania w Polsce wymaga uprzedniej analizy pod względem spełniania międzynarodowych standardów. Niniejszy artykuł przedstawia taką weryfikację przydatności systemu EGNOS na potrzeby polskiego transportu: lotniczego, morskiego, klejowego i drogowego. W tym celu scharakteryzowano i przeanalizowano cztery parametry sygnału systemu (dokładności, wiarygodności, ciągłości i dostępności) na podstawie danych pochodzących z bazy danych EGNOS Data Collection Network z lat 2011-2012. Monitorowane parametry zostały następnie porównane z obowiązującymi międzynarodowymi wymaganiami dla sygnałów systemów satelitarnych w poszczególnych rodzajach transportu. Pozwoliło to na ustalenie, czy system EGNOS może być w nich wykorzystywany.
Źródło:
Transport Problems; 2014, 9, 4; 27-37
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using electrical capacitance tomography system for determination of liquids in rocket and satellite tanks
Wykorzystanie systemu pojemnościowej tomografii komputerowej do określania poziomu płynów w zbiornikach rakiet i satelitów
Autorzy:
Gut, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/36411211.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
tomography
satellite
tank
tomografia
satelity
zbiorniki
Opis:
One of important problems in aerospace engineering is to determine the amount of fluid in the tank in a microgravity environment. There are several methods for doing it, however, there are no proven methods to quickly gauge the amount of propellant in a tank in low gravity conditions. New and more accurate methods of such a measurement are being continually searched for. One of interesting solutions is using Electrical Capacitance Tomography (ECT) for this purpose. The article presents both numerical analysis and experimental test results using a spherical tank. The main purpose of the simulation was to determine the effect of the number of electrodes and noise signal level on the quality of reconstruction images. In numerical simulations, different models of dielectric permittivity distribution have been reconstructed. On the basis of numerical simulations, a 24-electrode sensor was designed and made. In experimental tests, different distribution of medium inside the spherical tank was investigated. The results show that the method can directly measure the mass of fuel in the tank, as well as it allows for a visualization of fuel distribution, independent of the tank position in space, and the liquid-propellant system will be used.
Istotnym problemem w inżynierii kosmicznej jest sposób określenia ilości paliwa w zbiorniku w środowisku mikrograwitacji. Istnieje kilka metod określania poziomu cieczy w zbiorniku, jednakże nie ma sprawdzonych metod szybkiego pomiaru ilości paliwa w zbiorniku, gdy znajduje się on w stanie niskiej grawitacji. Trwają poszukiwania nowych i dokładniejszych metod pomiaru. Jednym z ciekawszych rozwiązań jest zastosowanie Pojemnościowej Tomografii Komputerowej do określania poziomu paliwa lub utleniacza w zbiornikach rakiet i satelitów. Otrzymane wyniki, które przeprowadzono z wykorzystaniem metod numerycznych oraz w warunkach grawitacji pokazują, że metoda może bezpośrednio mierzyć masę paliwa w zbiorniku, a także umożliwić wizualizację rozkładu paliwa, niezależnie od położenia zbiornika w przestrzeni i zastosowanego układu zasilania.
Źródło:
Transactions on Aerospace Research; 2020, 1 (258); 18-33
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The accuracy of defining position of sea infrastructure objects using satellite imagery data
Dokładność określania pozycji obiektów infrastruktury morskiej z wykorzystaniem satelitarnych danych obrazowych
Autorzy:
Klewski, A.
Sanecki, J.
Stępień, G.
Klewska, W.
Pabisiak, P.
Powiązania:
https://bibliotekanauki.pl/articles/360541.pdf
Data publikacji:
2011
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
obraz satelitarny
dokładność określania pozycji
ortofotomapa satelitarna
satellite imagery
accuracy of defining position
satellite orthophotomap
Opis:
The article presents the analysis of accuracy position defining of sea infrastructure objects using high-resolution satellite imagery. The analysis bases on defining co-ordinates of objects using large-scale maps (field measurements) and their comparison to co-ordinates reading on processed satellite imagery. The article presents the author’s method of location precision enlarging on satellite imagery through additional imagery data support (geodetic and cartographic). Results of conducted analysis define accuracy of object’s location on satellite imagery and are related to the possibility of using these images to large scale cartographical studies.
Artykuł przedstawia analizę dokładności określania pozycji obiektów infrastruktury morskiej z wykorzystaniem wysokorozdzielczych obrazów satelitarnych. Analiza opiera się na określeniu współrzędnych obiektów w oparciu o wielkoskalowe mapy (pomiary terenowe) i porównaniu ich do współrzędnych na przetworzonym obrazie satelitarnym. Artykuł prezentuje autorską metodę zwiększania dokładności lokalizacji obiektów na zdjęciach satelitarnych w oparciu o dodatkowe dane obrazowe (geodezyjne i kartograficzne). Wyniki przeprowadzonej analizy określają dokładność lokalizacji obiektów na obrazach satelitarnych i odnoszą się do możliwości wykorzystania tych obrazów w kartograficznych opracowaniach wielkoskalowych.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2011, 28 (100) z. 1; 48-52
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building distributed ground station system with radio amateurs
Autorzy:
Stolarski, M.
Winietki, W.
Powiązania:
https://bibliotekanauki.pl/articles/307624.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
space technology
satellite communications
radio amateurs
Opis:
The paper concerns radio amateur satellites that are built by international student teams. For contacting a satellite, a single ground station is usually used. In this configuration and with the satellite on the low Earth orbit (LEO), teams have contact only for about 40 minutes per day. If the satellite has service for radio amateurs, they use it for 20 hours per day. A lot of them have connection to Internet. This is a big difference. In this paper, is shown how they can use the radio amateur transceivers and antenna systems in order to build ground stations network named distributed ground station system (DGSS). Frequencies, types of modulations, calculation of power budge, and the ways to control amateur stations by the Internet are also shown. These are essential procedures, because radio amateurs have their standards and habits. Finally a proposal of implementation dedicated DGSS system for radio amateurs with and without use of APRS network is put forward. Distributed ground station is one of the experiments on PW-Sat satellite, which is being build on the Warsaw University of Technology.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 72-75
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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