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Wyświetlanie 31-40 z 40
Tytuł:
Upwelling dynamics in the Baltic Sea studied by a combined SAR-infrared satellite data and circulation model analysis
Autorzy:
Gurova, E.
Lehmann, A.
Ivanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/48338.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
coastal upwelling
MODIS satellite image
circulation model
synthetic aperture radar
sea surface temperature
wind stress
Źródło:
Oceanologia; 2013, 55, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
S-band and Ku-band SAR system development for UAV-based applications
Autorzy:
Kaniewski, Piotr
Komorniczak, Wojciech
Leśnik, Czesław
Cyrek, Jacek
Susek, Waldemar
Serafin, Piotr
Łabowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/221666.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned aerial vehicle
UAV
synthetic aperture radar
SAR
Range–Doppler algorithm
RDA
imagery intelligence system
IMINT system
Opis:
This paper describes a synthetic aperture radar system for tactical-level imagery intelligence installed on board an unmanned aerial vehicle. Selected results of its tests are provided. The system contains interchangeable S-band and Ku-band linear frequency-modulated, continuous wave radar sensors that were built within a frame of a research project named WATSAR, conducted by the Military University of Technology and WB Electronics S.A. One of several algorithms of radar image synthesis, implemented in the scope of the project, is described in this paper. The WATSAR system can create online and off-line radar images.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 53-64
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imprints of atmospheric waves on the Black Sea surface in data of ocean color scanners
Autorzy:
Evdoshenko, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/2079182.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
remote sensing
ocean optics
Black Sea
sea surface
synthetic aperture radar
microwave radiation
boundary layer
satellite observation
Opis:
Data from MERIS onboard Envisat and MODIS onboard Terra and Aqua for 15–16 May 2010 were used to study powerful imprints of atmospheric gravity waves (AGWs) on the western part the Black Sea surface. Two cold fronts crossed the sea following the warm front and caused the AGWs which modulated the sea surface. Imprints of AGWs appeared as stripes of alternating brightness, they had crest length more than a hundred kilometers and wavelength of units of kilometers. Wave amplitude of AGWs imprints, evaluated by a 90%-depth of light penetration into the sea at 490 nm z90, the value inverse to the diffuse attenuation coefficient Kd_490, was units of decimeterxs. MODIS 250-m data of remote sensing reflectance, wind components and atmospheric pressure near the sea surface were obtained by processing the top of atmosphere data with the SeaDAS software package. Negative correlations of fluctuations of z90 with fluctuations of wind stress and atmospheric pressure were found on the transects of more than ten kilometers. The impact of wind stress on the origination of AGW imprints was found to be determinant, while the impact of atmospheric pressure was not more than units of percent.
Źródło:
Oceanologia; 2020, 62, 3; 255-266
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modifications of Range-Doppler Algorithm for Compensation of SAR Platform Motion Instabilities
Autorzy:
Gorovyi, I. M.
Bezvesilniy, O. O.
Vavriv, D. M.
Powiązania:
https://bibliotekanauki.pl/articles/226865.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Synthetic Aperture Radar (SAR)
SAR
range-Doppler algorithm
RDA
multi-look processing
image formation
radiometric errors
autofocus
Opis:
Two modifications of the range-Doppler algorithm (RDA) have been proposed to solve problems of SAR platform motion instabilities. First, the multi-look processing based on the RDA with an extended Doppler bandwidth has been introduced for correction of radiometric errors. Second, the RDA has been modified to perform SAR image formation on short-time acquisition intervals to use it in a recently-developed local-quadratic map-drift autofocus (LQMDA) method. The performance of the methods is illustrated with experimental data obtained by airborne SAR systems.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 3; 225-231
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of displacements and deformations of the earth’s surface near the Stebnyk city using radar images of Sentinel-1
Autorzy:
Trevoho, Ihor
Chetverikov, Borys
Babiy, Lubov
Malanchuk, Mariia
Powiązania:
https://bibliotekanauki.pl/articles/145388.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interferometria radarowa
radar
deformacja powierzchni
radar interferometry
Synthetic Aperture Radar
Sentinel-1
deformations of the Earth’s surface
Opis:
This article applies radar interferometry technologies implemented in the ENVI SARscape and SNAP software environment provided by the processing of data from the Sentinel-1 satellite. The study was carried out based on six radar images of Sentinel-1A and Sentinel -1B taken from September 2017 until February 2018 with an interval of one month and on the radar-module of the already mentioned SNAP software. The main input data for solving the considered problem are radar images received from the satellite Sentinel-1B on the territory of Stebnyk-Truskavets for six months with an interval of one month. Monitoring of the Earth’s surface using radar data of the Sentinel-1A with a synthesized aperture is implemented with the application of interferometric methods of Persistent Scatterers and Small baselines interferometry for estimating small displacements of the Earth’s surface and structures. The obtained quantitative and qualitative indicators of monitoring do not answer the processes that take place and lead to vertical displacements the six months but do provide an opportunity to assess the extent and trends of their development. The specification in each case can be accomplished by ground methods, which greatly simplify the search for sites with critical parameters of vertical displacements which can have negative consequences and lead to an emergency.
Źródło:
Geodesy and Cartography; 2020, 69, 1; 85-96
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of synthetic aperture radar interferometry to monitor surface deformations of the Trans-European Transport Network (TEN-T) - a case study of the motorways crossing areas of mining operations in the Upper Silesian coal basin, Poland
Autorzy:
Stawinoga, Mariusz
Pindel, Tomasz
Smoliński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2073901.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
mining activities
interferometric synthetic aperture radar
inSAR
road deformation
highway
działalność górnicza
satelitarna interferometria radarowa
deformacja dróg
autostrada
Opis:
Underground hard coal mining causes surface deformations. When the mining operations are conducted beneath linear objects, such as motorways, there is a risk of deformations of the axis of the road and its horizontal and vertical alignment (additional bends and vertical curvatures, longitudinal inclinations, deformations of cross-sections). In the areas subjected to mining operations, mining plants conduct geodetic monitoring. Due to their labour intensity and costs, geodetic measurements are usually made only a few times a year. The article discusses the possibility of applying Interferometric Synthetic Aperture Radar (InSAR) to monitor the subsidence of the vertical alignment of motorways caused by mining operations and its advantages and disadvantages compared to the currently used methods of geodetic measurements. The tests were conducted in two sections of motorways within the Upper Silesian Coal Basin (Poland) in the areas of intensive hard coal mining operations. Radar imaging of the surface made by the European Space Agency's (ESA) satellite Sentinel-1 equipped with the Synthetic Aperture Radar (SAR) was used.
Źródło:
Journal of Sustainable Mining; 2021, 20, 3; 136--143
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of UAV Position with Use of Smoothing Algorithms
Autorzy:
Kaniewski, P.
Gil, R.
Konatowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/221380.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Unmanned Aerial Vehicle
Inertial Navigation System
Global Navigation Satellite System
Integrated Navigation System
Synthetic Aperture Radar
Kalman Filter
smoothing algorithm
Opis:
The paper presents methods of on-line and off-line estimation of UAV position on the basis of measurements from its integrated navigation system. The navigation system installed on board UAV contains an INS and a GNSS receiver. The UAV position, as well as its velocity and orientation are estimated with the use of smoothing algorithms. For off-line estimation, a fixed-interval smoothing algorithm has been applied. On-line estimation has been accomplished with the use of a fixed-lag smoothing algorithm. The paper includes chosen results of simulations demonstrating improvements of accuracy of UAV position estimation with the use of smoothing algorithms in comparison with the use of a Kalman filter.
Źródło:
Metrology and Measurement Systems; 2017, 24, 1; 127-142
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tools for optimizing performance of VOYages at sea
Autorzy:
Johannessen, J. A.
Perrin, A.
Gaultier, L.
Herlédan, S.
Pouplin, C.
Collard, F.
Maze, J. P.
Dussauze, M.
Rapp, J.
Fanebust, R.
Andersen, S.
Franks, O.
Meyer, R.
Powiązania:
https://bibliotekanauki.pl/articles/1841544.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
voyage at sea
Copernicus Marine Environment Monitoring Service
optimization tool
synthetic aperture radar
finite-size lyapunov exponent
route optimization
sea surface temperature
route optimization algorithm
Opis:
The aim of the TOPVOYS project supported by the MarTERA ERA-Net Cofund program within the European Commission is to advance and implement analyses tools and decision support system for voyage optimisation. Based on marine weather analyses and forecasts combined with near real time satellite-based observations of wind, wave and surface current conditions as well as sea surface temperature fields the best shipping route are examined. The proposed approach aims to identify the optimum balance between minimisation of transit time and fuel consumption as well as reduction of emissions without placing the vessel at risk to damage and or crew injury. As such it is compliant with the International Maritime Organization guidelines [6] for ship routeing to keep the traffic smooth and avoid accidents, notably in the presence of unfavorable marine meteorological conditions. The tool performances will be demonstrated both in post-voyage analyses and real time operations for the North Atlantic Ocean crossings, voyages from Europe through the Mediterranean Sea and the Suez Channel to the Far East (e.g. China, South Korea) and voyages around Southern Africa.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 233-239
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship-iceberg detection & classification in sentinel-1 SAR images
Autorzy:
Heiselberg, H.
Powiązania:
https://bibliotekanauki.pl/articles/117491.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
arctic shipping
ship-iceberg detection
sentinel-1
Synthetic Aperture Radar (SAR)
European Space Agency (ESA)
SAR Imagery
copernicus program
ground range detected
high resolution (GRDH)
Opis:
The European Space Agency Sentinel-1 satellites provide good resolution all weather SAR images. We describe algorithms for detection and classification of ships, icebergs and other objects at sea. Sidelobes from strongly reflecting objects as large ships are suppressed for better determination of ship parameters. The resulting improved ship lengths and breadths are larger than the ground truth values known from Automatic Identification System (AIS) data due to the limited resolution in the processing of the SAR images as compared to previous analyses of Sentinel-2 optical images. The limited resolution in SAR imagery degrades spatial classification algorithms but it is found that the backscatter horizontal and vertical polarizations can be exploited to distinguish icebergs in the Arctic from large ships but not small boats or wakes.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 235-241
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numeryczne dane wysokościowe misji TanDEM-X
Digital elevation models of TanDEM-X mission
Autorzy:
Woroszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/210271.pdf
Data publikacji:
2015
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
misja TanDEM-X
misja SRTM
interferometria radarowa
numeryczny model pokrycia terenu
TanDEM-X
SRTM
interferometry synthetic aperture radar
digital elevation model (DEM)
digital surface model
Opis:
Zapoczątkowana w 2010 roku misja TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) jest pierwszą satelitarną misją radarową, w ramach której zostały pozyskane dane interferometryczne w trybie bistatic InSARstripmap przez dwa bliźniacze satelity TerraSAR-X (TSX) oraz TanDEM-X (TDX) tworzące formację Helix. Realizacja tej konfiguracji ma na celu budowę numerycznego modelu pokrycia terenu (NMPT) o zasięgu globalnym w standardzie HRTI-3 (High Resolution Terrain Information). W artykule przedstawiono opis i specyfikację podstawowych produktów misji, jakimi są m.in. numeryczne modele pokrycia terenu, a także dodatkowych komponentów w postaci warstw informacyjnych i masek. Opisane zostało również zastosowanie techniki interferometrii radarowej w procesie budowy numerycznego modelu pokrycia terenu w postaci cyfrowej.
Started in 2010 TanDEM-X mission (TerraSAR-X add-on for Digital Elevation Measurement) is the first space borne radar interferometer mission that acquires interferometric data in bistatic InSARstripmap mode with two spacecrafts TerraSAR-X (TSX) and TanDEM-X (TDX) flying in Helix formation. That configuration enables generation of a global digital elevation model compatible with the HRTI-3 standard. This paper presents an overview and specification of primary products of the TanDEM-X mission, i.e. digital elevation models and additional components such as information layers and masks. Moreover, the use of radar interferometry techniques for generation of the digital elevation model (DEM) and applications of InSARare discribed.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2015, 64, 1; 33-46
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 31-40 z 40

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