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Wyświetlanie 1-15 z 95
Tytuł:
A Matlab Implementation of Differential GPS for Low-cost GPS Receivers
Autorzy:
Ali, Q
Montenegro, S.
Powiązania:
https://bibliotekanauki.pl/articles/116127.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
marine navigation
Global Positioning System GPS
Matlab, Differential GPS (DGPS)
GPS Receiver
unmanned aerial vehicle (UAV)
Global Navigation Satellite System (GNSS)
RINEX Format
Opis:
A number of public codes exist for GPS positioning and baseline determination in off-line mode. However, no software code exists for DGPS exploiting correction factors at base stations, without relying on double difference information. In order to accomplish it, a methodology is introduced in MATLAB environment for DGPS using C/A pseudoranges on single frequency L1 only to make it feasible for low-cost GPS receivers. Our base station is at accurately surveyed reference point. Pseudoranges and geometric ranges are compared at base station to compute the correction factors. These correction factors are then handed over to rover for all valid satellites observed during an epoch. The rover takes it into account for its own true position determination for corresponding epoch. In order to validate the proposed algorithm, our rover is also placed at a pre-determined location. The proposed code is an appropriate and simple to use tool for post-processing of GPS raw data for accurate position determination of a rover e.g. Unmanned Aerial Vehicle during post-mission analysis.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 343-350
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low bandwidth network-RTK correction diissemination for high accuracy maritime navigation
Autorzy:
Alissa, S.
Håkansson, M.
Henkel, P.
Mittmann, U.
Hüffmeier, J.
Rylander, R.
Powiązania:
https://bibliotekanauki.pl/articles/1841552.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
real time kinematic
high accuracy maritime navigation
network-RTK
Global Navigation Satellite System
VHF data exchange system
GNSS receiver
virtual reference station
physical reference stations
Opis:
More than half of the incidents reported to EMSA relate to nautical events such as collision, groundings and contacts. Knowledge of accurate and high-integrity positioning is therefore not only a need for future automated shipping but a base for today’s safe navigation. Examples on accidents include Ever Given in the Suez Canal and HNoMS Helge Ingstad in Norway. A Network-RTK (NRTK) service can be used as an augmentation technique to improve performance of shipborne GNSS receivers for future positioning of manned and unmanned vessels in restricted areas, such as port areas, fairways, and inland water ways. NRTK service providers generate RTK corrections based on the observations of networks of GNSS reference stations which enables the users to determine their position with centimeter accuracy in real-time using a shipborne GNSS receiver. Selection of appropriate communication channels for dissemination of NRTK corrections data is the key to a secure positioning (localization) service. In PrePare-Ships project, the modern maritime communication system VDES (VHF Data Exchange System) is proposed to distribute SWEPOS (NRTK in Sweden) correction data to shipborne positioning modules. VDES is a very reliable technique and it is compatible with most onboard functionalities. In order to minimize the impact on the overall VDES data capacity in a local area, NRTK correction data shall only occupy a single VDES slot with a net capacity of 650 bytes. Update rates may vary but are preferably at 1Hz. However, NRTK correction data size changes instantly, depending on the number of visible GNSS satellites, and the data rate can therefore sometimes reach in excess of 1000 byte/s. In this study, a smart technique is proposed to reduce size of NRTK correction data to instantly adapt with the VDES requirements by choosing a combination of specific signals, satellites or even constellations such that the data rate is not more than 650 byte/s, and at the same time it achieves optimal positioning performance with the accuracy required by the PrePare-Ships project application.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 171-179
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of oil spill fighting by using SAR satellite detection and e-navigation systems
Autorzy:
Bąk, A.
Powiązania:
https://bibliotekanauki.pl/articles/359631.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
oil spill
satellite detection
e-navigation system
problems identification
incidents
Opis:
The article presents the solution for improvement of oil spill fighting with utilization of synthetic aperture radar. The way of identification is presented as well as the treatment of obtained data in order to eliminated “looks like” objects. Such system will widely improve the oil spill fighting at a very early stage of incident.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 27-31
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The geometrical factors of a navigational systems
Autorzy:
Banachowicz, A.
Banachowicz, G.
Wolski, A.
Powiązania:
https://bibliotekanauki.pl/articles/224416.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
systemy nawigacyjne
pozycjonowanie satelitarne
GPS
system pozycjonowania obiektów
DGPS
nawigajca morska
navigational systems
satellite positioning
Global Positioning System
maritime navigation
Opis:
Vessels engaged in coastal navigation must have their position determined with high accuracy. This can be ensured only by satellite systems such as GPS and GLONASS. The paper presents generalized concepts of geometrical factors of a navigational system. Such factors are used in the analysis of the accuracy of various radionavigational systems aimed at selecting the best system for a given area. The modern process of navigation is described in a four-dimensional space - three geometric dimensions and time. For this reason both the description and analysis of navigational systems should be performed in the same space. The traditional geometric factor of the land-based radionavigational system was generalised to include the factors GDOP, PDOP, HDOP, VDOP and TDOP for the needs of the accuracy analysis of a GPS system. These terms are related to the so-called geometry of navigational system - through mutually related positions of gradients of navigational functions determining position Iines (hyperplanes). They are connected with non-Iinear regression through a probabilistic relation between the measured navigational parameters. Consequently, the concept of geometric factors in the process of navigational parameters estimation can be also extended to include a larger number of dimensions appropriate for the state vector.
Źródło:
Reports on Geodesy; 2006, z. 1/76; 261-267
0867-3179
Pojawia się w:
Reports on Geodesy
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:
Conception of EGNOS Integrity Data Utilization in ENC Systems
Autorzy:
Bilewski, M.
Zalewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/117265.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
EGNOS
Electronic Chart Display and Information System (ECDIS)
Marine Vessel Protection Area (MVPA)
Electronic Navigational Charts (ENC)
Full Mission Bridge Simulator (FMBS)
integrity
Opis:
The paper presents the processing of EGNOS integrity data received either directly from the satellite network or the Sisnet internet relay. Relationship between the individual frames in EGNOS messages has been described. Usefulness of these data was indicated by the three examples. In the first example data form EGNOS was used to compare integrity parameters and the calculated position error. In further examples the simulated position with error and calculated integrity parameters were implemented together. The results were presented in two ways: with use of dedicated program which presents only ship contours (the one not covering GNSS uncertainty and the one covering this uncertainty called Marine Vessel Protection Area) and as a layer in existing ECDIS.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 3; 389-393
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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
  • odwiedzone
Tytuł:
An Effect of Urban Development on the Accuracy of the GPS/EGNOS System
Autorzy:
Bober, R.
Szewczuk, T.
Wolski, A.
Powiązania:
https://bibliotekanauki.pl/articles/116270.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
Global Positioning System GPS
EGNOS
Effect of Urban Development
Accuracy
Accuracy of Position
positioning system
Port of Szczecin
Opis:
This article presents the results of research into the accuracy of position determination by a GPS/EGNOS system in a densely built-up residential area. These results are compared with the relevant results obtained for a position in an open area.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 235-238
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza dokładności wyznaczania współrzędnych wybranymi odbiornikami GNSS w środowisku leśnym
Accuracy analysis for determination of coordinates by the selected GNSS receivers in the forest environment
Autorzy:
Brach, M.
Powiązania:
https://bibliotekanauki.pl/articles/995919.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
geodezja lesna
nawigacja satelitarna
system ASG-EUPOS
odbiornik GNSS
dokladnosc pomiaru
forest geodesy
satellite navigation
gnss
asg−eupos
dgps
Opis:
Forest digital maps have practical application provided, inter alia, their continuous updating by employing reliable measurement methods. Satellite navigation technology is an excellent source of geometric data. The paper presents an analysis of the positioning accuracy for five navigation receivers of different classes used to measure X, Y, Z coordinates in the forest environment. The measurements were conducted using a network of reference stations ASG−EUPOS. The error analysis was based on the precisely measured geodetic control network.
Źródło:
Sylwan; 2012, 156, 01; 47-56
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of geomagnetic event as observed in Northern Adriatic region and Its correlation with GPS single-frequency positioning deviations
Autorzy:
Brčić, D.
Ćelić, J.
Valčić, S.
Powiązania:
https://bibliotekanauki.pl/articles/116009.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
geomagnetic event
Northern Adriatic
Global Positioning System (GPS)
positioning deviations
positioning
Navigation and Timing (PNT)
Total Electron Content (TEC)
Classification and Regression Trees (CART)
Opis:
Space weather effects are generally recognized as causes of degradation of satellite positioning, navigation and timing (PNT) services. We analyze GPS position estimation error during a geomagnetic storm, focusing on manifestations of geomagnetic processes. The position estimation error was analyzed in terms of GPS coordinates’ deviations (latitude, longitude and height) from their reference values. The storm’s impact was studied in the Northern Adriatic region where GPS observables from two Global Navigation Satellite System (GNSS) reference stations were analysed. Geomagnetic indices were elaborated, comprising readings from interplanetary, magnetospheric and geomagnetic observatories. Total Electron Content (TEC) on both stations was computed using dual frequency GPS pseudorange observables. The experiment was to reconstruct the movement of geomagnetic disturbances entering the geospace, reaching the earth’s surface. The aim was to correlate possible space weather manifestation on satellite positioning performance in terms of positioning error. Regularities in changes in positioning deviations were identified with relation to influential indices. The research offered a possibility of experimental positioning deviations assessment as well as forecasting. Evaluation of generated rudimentary Classification and Regression Trees (CART) models showed that the risk of satellite positioning errors could be assessed and predicted considering absolutes, as well as changes in values of geomagnetic indices. During the research process, several activities emerged as preferable continuation of the work, with the aim of further development of predictive models and the complement of space weather scenarios and their consequences on navigational systems. Along with summarized results, they are outlined in the conclusion section.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 349-357
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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:
Flexible Software Design for Korean WA-DGNSS Reference Station
Autorzy:
Choi, W.S.
Chhattan, S.S.
Kye, J.E.
Han, W.Y.
Yun, H.
Kee, C.
Powiązania:
https://bibliotekanauki.pl/articles/116770.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
Flexible Software Design
Wide area Reference Station (WRS)
Opis:
In this paper, we describe the software design results of WA‐DGNSS reference station that will be constructed in Korea in the near future. Software design of the WRS (Wide area Reference Station) is carried out by applying object oriented software methodology in order to provide flexibilities: easy of model change (namely ionospheric delay model etc) and system addition (Galileo, GLONASS in addition to GPS etc). Software design results include the use case diagrams for the functions to be executed, the architecture diagram showing components and their relationships, the activity diagrams of behaviors and models among them, and class diagrams describing the attribute and operation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 75-78
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości wykorzystania technik satelitarnych w produkcji rolniczej
Possibilities of the use of modern satellite techniques in agriculture
Autorzy:
Ciećko, Adam
Brodziński, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/2232285.pdf
Data publikacji:
2010-07-28
Wydawca:
Centrum Doradztwa Rolniczego w Brwinowie. Oddział w Poznaniu
Tematy:
nowoczesne techniki satelitarne
GNSS (Globalny System Nawigacji Satelitarnej)
rolnictwo precyzyjne
modern satellite techniques
GNSS (Global Navigation Satellite System)
precision agriculture
Opis:
W artykule przedstawiono możliwości wykorzystania nowoczesnych technik satelitarnych w produkcji rolniczej. Wśród kluczowych elementów precyzyjnego rolnictwa zidentyfikowano: – informację o pozycji obiektów (maszyn, pojazdów, zwierząt i in.), – pomiar powierzchni działek rolnych, – system jazdy równoległej to system nawigacji ciągników i maszyn rolniczych, który zapewnia uzyskanie równoległych torów jazdy, – mapy zasobności i zmienności glebowej przedstawiające przestrzenne rozmieszczenie czynników wpływających na urodzajność gleby, – mapy aplikacyjne umożliwiające stosowanie technologii zmiennego dawkowania.
Paper presents new possibilities of the use of modern satellite techniques in agriculture. Several key elements of precision agriculture was deffned and described: – information about position of objects (machines, vehicles, animals, etc.), – parcel area measurement, – parallel driving system as a navigation tool for tractors and agriculture machines, – soil maps showing distribution of soil types and/or soil properties (physical, chemical, biological, and fertility properties), – application maps which practically allow to use variable rate application (VRA) technology.
Źródło:
Zagadnienia Doradztwa Rolniczego; 2010, 60, 1-2; 113-121
1232-3578
2719-8901
Pojawia się w:
Zagadnienia Doradztwa Rolniczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EGNOS Status and Performance in the Context of Marine Navigation Requirements
Autorzy:
Cydejko, J.
Powiązania:
https://bibliotekanauki.pl/articles/116957.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
EGNOS
Marine Navigation Requirements
positioning system
Satellite Positioning
Maritime Transport Requirements
Positioning Performance
Polish Coast
Opis:
The current status of EGNOS (December 2006) is described as Initial Operations Phase and the EGNOS Open Service is just about to be formally declared as available for non-safety of life service. In meanwhile the EGNOS Signal in Space is provided almost in its nominal level and delivering, when available, the nominal system performance. New positioning technologies, such as EGNOS in Europe, create a new quality in marine navigation and bring further improvement of the maritime transport safety. It may be expected that very soon EGNOS will find significant interest among the maritime community serving as the augmentation system in the maritime transport applications of GNSS. The paper discusses the EGNOS status and the expected EGNOS performance in the context of marine navigation requirements. The system performance analysis is backed with the study of the various field tests results where the EGNOS positioning performance was verified by author in the experimental way.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 229-234
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the IANS Chain Using a Satellite System
Autorzy:
Czaplewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/116843.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Interactive Navigational Structures (IANS)
navigational methods
navigation techniques
terrestrial navigation
vessel traffic service (VTS)
satellite system
satellite positioning system
differential GPS (DGPS)
Opis:
This paper presents ideas for creating and developing Interactive Navigational Structures (IANS) by using satellite systems. The author of the present paper introduced the concept of IANS into the literature in 2004 (Czaplewski, 2004). The paper presents the possibility of adapting the contemporary methods of robust estimation that are used in geodesy for the purpose of performing selected marine navigation tasks. IANS utilise modern M-estimation methods. Interactive structures can assist human beings in carrying out special tasks at sea, for example, in identifying objects at sea and on land without the need to approach them. Moreover, these structures can also be used in the process of navigation carried out by underwater vehicles or unmanned watercraft. This paper presents the mathematical methods that are essential for creating IANS. The theoretical assumptions are illustrated with an example of how IANS can be used while performing a typical navigation task. The paper closes with information about research studies which deal with the practical aspects of using this set of mathematical methods.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 485-493
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
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