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    Wyświetlanie 1-4 z 4
    Tytuł:
    Optimizing the minimum cost flow algorithm for the phase unwrapping process in SAR radar
    Autorzy:
    Dudczyk, J.
    Kawalec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200190.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    IFSAR
    Interferometry Synthetic Aperture Radar
    minimum cost flow
    MCF
    phase unwrapping
    PhU
    Opis:
    The last three decades have been abundant in various solutions to the problem of Phase Unwrapping in a SAR radar. Basically, all the existing techniques of Phase Unwrapping are based on the assumption that it is possible to determine discrete ”derivatives” of the unwrapped phase. In this case a discrete derivative of the unwrapped phase means a phase difference (phase gradient) between the adjacent pixels if the absolute value of this difference is less than π. The unwrapped phase can be reconstructed from these discrete derivatives by adding a constant multiple of 2π. These methods differ in that the above hypothesis may be false in some image points. Therefore, discrete derivatives determining the unwrapped phase will be discontinuous, which means they will not form an irrotational vector field. Methods utilising branch-cuts unwrap the phase by summing up specific discrete partial derivatives of the unwrapped phase along a path. Such an approach enables internally cohesive results to be obtained. Possible summing paths are limited by branch-cuts, which must not be intersected. These branch-cuts connect local discontinuities of discrete partial derivatives. The authors of this paper performed parametrization of the Minimum Cost Flow algorithm by changing the parameter determining the size of a tile, into which the input image is divided, and changing the extent of overlapping of two adjacent tiles. It was the basis for determining the optimum (in terms of minimum Phase Unwrapping time) performance of the Minimum Cost Flow algorithm in the aspect of those parameters.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 511-516
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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
    Tytuł:
    Mapping of Surface Deformation and Displacement Associated with the 6.5 Magnitude Botswana Earthquake of 3 April 2017 Using DInSAR Analysis
    Autorzy:
    Thomas, Abraham
    Powiązania:
    https://bibliotekanauki.pl/articles/1837989.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    differential interferometric synthetic aperture radar (DInSAR)
    interferometry
    Sentinel-1
    Botswana earthquake
    Opis:
    The DInSAR analysis was performed for mapping surface deformation and displacement associated with the 6.5 magnitude Botswana earthquake of 3 April 2017 using Sentinel 1 data and SNAP. The analyses involved: coregistration of SAR images, interferogram formation, debursting, merging of sub swaths, topographic phase removal, phase filtering, phase unwrapping, orthorectification and calculation of vertical displacement for two situations (unmasked and masked with a layer of coherence ≥0.6). The vertical displacement for the unmasked situation ranged from −122 mm to +136 mm whereas in the masked layer it ranged from −84 mm to +122 mm. Negative surface deformation (subsidence) is seen in the epicentre region and eastern, north eastern, northern areas of the image whereas major positive surface deformations (uplift) are seen in the south western, western and north western corner part. Comparison of displacements with geology revealed that major deformation occurred in the Karoo basalts and lesser surface deformation has occurred in the Lebung Group rocks of the northern, NE and SW region. The elongated shape of deformation near the epicentre and positive vertical displacement seen towards the SW of the epicentre and negative vertical displacement seen towards NE of the epicentre reveals that the region has undergone uplifting and subsidence on either side of the area close to the epicentre (similar to faulting in a NW or SE direction). The boundaries of the uplift and subsidence regions inferred as long lineaments were digitised as faults. Comparison of the deformation with existing seismotectonic map revealed the existence of some north westerly faults seen in the region.
    Źródło:
    Geomatics and Environmental Engineering; 2020, 14, 4; 81-100
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    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
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