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标题：SAR PERSISTENT SCATTERERS: TARGETS CHARACTERIZATION IN URBANIZED AREAS WITH ENVISAT ALTERNATING POLARISATION DATA
其他标题：INTERPRETACJA DANYCH ENVISAT/ASAR O PRZEMIENNEJ POLARYZACJI NA OBSZARACH ZURBANIZOWANYCH W KONTEKŚCIE CHARAKTERYSTYKI STABILNYCH ROZPRASZACZY (PERSISTENT SCATTERERS)
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作者：Zbigniew Perski ; Gini Ketelaar ; Marek Mróz 等
期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2006
卷号：16
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：The scope of presented work was to apply the ENVISAT/ASAR data acquired in different alternating polarization modes and under different viewing geometry to characterize Persistent Scatterers (PS) in the context of their scattering mechanism. Persistent Scatterers are explored by SAR interferometry (InSAR) in the Persistent Scatterers Interferometry (PS-InSAR) method. This technique is nowadays one of the most actively developing branches of InSAR. It utilizes coherent natural "radar reflectors" with a consistent reflectivity pattern in time. The PS-InSAR method is the first one to allow the exploration of almost all archived SAR data over a certain area and can retrieve a long-term series of the observations of the individual PS points. Despite this,PS-InSAR used as an operational method of the scattering mechanisms of individual PS is still not fully explored. It is usually not known if the scatterer has specular,dihedral or trihedral geometry and if the reflection comes from one individual strong target or a set of targets located within the resolution cell. Knowledge about scatterer characteristics is very important to separate scatterers representing different deformation regimes: e.g. subsidence,deformations of the construction,soil compaction. This problem becomes crucial if spatial interpolation of the deformation signal is required. A high density of PS is typical for densely urbanized areas (> 100 PS/km2 ). Urban areas are also ones of the highest interests,in terms of inhabitants’ safety. For purposes of this study,Malbork City in Northern Poland was selected because of its very good coverage of ASAR alternating polarization data acquired under different modes and incidence angles. The specific various ASAR acquisitions have been designed for the purposes of the ESA AO-783 project which was focused on environmental and agricultural classification. A set of Persistent Scatterers has been collected by processing a stack of 55 ERS-1/2 SAR scenes (ESA C1P.3915 project) using Delft University of Technology’s implementation of the PSI method. The 5683 PS points have been obtained that have a coherent behavior. ASAR scenes were calibrated and an analysis of auto-interferogram phase and image amplitudes was performed. Further analysis of the ASAR data is focused on the relationship between incidence angle variations and amplitude,and on the change of polarization. The results were compared with the scattering models of canonical scatterers (specular,dihedral and trihedral). Preliminary results show that applications of variable incidence angle and alternating polarization data are a promising technique regarding scatterer characterization. However,to fully quantitatively analyze the data,precise coregistration is required.
其他摘要：W artykule przedstawiono próbę wykorzystania danych ENVISAT/ASAR zarejestrowanych w róŜnych trybach polaryzacji przemiennej i przy róŜnej geometrii padania wiązki radarowej do scharakteryzowania rozpraszaczy stabilnych (Persistent Scatterers - PS) w konte
关键词：Persistent Scatterers;SAR Interferometry;SAR Polarimetry;incidence angle;urban areas
其他关键词：interferometria SAR;persistent scatterers;polarymetria;ERS;ENVISAT