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Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR - art. no. 67460N
Yunhua Zhang; Xiaojin Shi; Jingshan Jiang; 北京8701信箱
Department国家863计划微波遥感技术实验室
Source PublicationProceedings of the Society of Photo-Optical Instrumentation Engineers (Spie)
2007
PagesN7460-N7460
Language英语
ISSN0277-786X
ISBN978-0-8194-6904-5
AbstractThis paper introduces a simple method to obtain a much higher resolution than the designed resolution in both azithumal and range directions for SAR by synthesizing the data taken by repeat passes without increasing any complexity in SAR hardware and satellite platform. The basic idea of the method is to firstly establish the equivalence between the signal models of repeat pass SAR signals in both azithumal and range directions and the signal model of stepped frequency chirp signals (SFCSs) when some conditions are presumed, i.e. for range direction, interferometric condition is required and for azimuthal direction, a small squint angle increase between repeat passes is required, and then using the already proposed method for SFCSs compression to process the data of repeat passes. In the course of processing, each observation in range direction or in azimuthal direction is treated as a subchirp in SFCSs. The major facts affecting the final resolution one could get are investigated and found. They are the relative range measurement accuracy and the absolute squint angle measurement accuracy between repeat passes. Detailed derivations and simulations are presented to show the effectiveness of the method.
KeywordSpaceborne Sar Repeat-pass Resolution Improvement High-resolution Stepped Frequency Chirp Signals (Sfcss) Matched Filtering Doppler Spectrum Spatial Spectrum Combination
Conference NameConference on SAR Image Analysis, Modeling, and Techniques IX
Conference Date2007
Conference PlaceFlorence, ITALY
Indexed ByCPCI
Document Type会议论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1785
Collection微波遥感部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Yunhua Zhang,Xiaojin Shi,Jingshan Jiang,et al. Resolution improvement in both azimuthal and range directions with repeat-pass spaceborne SAR - art. no. 67460N[C]. BELLINGHAM:Spie-Int Soc Optical Engineering,2007:N7460-N7460.
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