超高分辨率机载聚束SAR空变运动误差校正
doi: 10.3724/SP.J.1146.2008.00073
Space-Variant Motion Compensation in Ultra-high Resolution Airborne Spotlight SAR
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摘要: 该文分析了机载聚束式合成孔径雷达(SAR)运动误差的空变性，推导了空变的运动误差与聚束扫描角度、照射区域大小及天线下视角等参数之间的定量关系，针对超高分辨率机载聚束SAR成像运动误差空变效应明显的问题，提出一种基于chirp扰动的距离重采样新方法，并结合图像方位分块处理技术构建了比较完善的运动补偿方案，以弥补传统运动补偿方法在超高分辨率机载SAR成像中的不足。最后，用仿真实验验证了方案的有效性。Abstract: The compensation for space-variant motion errors is one of the main issues in ultra-high resolution airborne SAR imaging. This paper first discusses the characteristics of space-variant motion errors of airborne spotlight SAR, and deduces the quantificational relationship between space-variant motion errors and SAR imaging parameters such as scan angle, size of illuminated scene and grazing angle. Then, it presents a comprehensive processing scheme for motion compensation of high resolution airborne spotlight SAR, which is based on the sub-patches processing and a new method of range resample using chirp disturbance. This scheme can make up for the deficiency of traditional process and deals well with severe space-variant motion errors in ultra-high resolution imaging. Finally, computer simulations prove the validity of the scheme.
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Fornaro G. Trajectory deviations in airborne SAR: Analysisand compensation[J].IEEE Trans. on Aerospace andElectronic Systems.1999, 35(3):997-1009[2]Prats P, Reigber A, and Mallorqui J J. Topographydependentmotion compensation for repeat-passinterferometric SAR systems[J].IEEE Trans. on Geosci.Remote Sens.2005, 2(2):206-210[3]Scheiber R and Bothale V. Interferometric multi-looktechniques for SAR data[C]. IEEE IGARSS Proc, Toronto,Canada, 2002, 1: 173-175.[4]Madsen S N. Motion compensation for ultra wide bandSAR[C]. IEEE IGARSS Proc., Sydney, Australia, 2001, 3:1436-1438.[5]de Macedo, K A C, and Scheiber R. Precise topography-andaperture- dependent motion compensation for airborneSAR[J].IEEE Trans. on Geosci. Remote Sens.2005, 2(2):172-176[6]Gou Yong-mei, Chen Hao, and Hong Wen, et al.. Resample inthe first order motion compensation of realtime SARprocessor[C]. ICSP2000 Proc., Beijing, China, 2000, 3:1830-1833.[7]Carrara W G, Goodman R S, and Majewski R M. SpotlightSAR: Signal Processing Algorithms[M]. Boston, ArtechHouse, 1995, Chapter 5.[8]Reigber A, Alivizatos E, and Potsis A, et al.. Extendedwavenumber-domain synthetic aperture radar focusing withintegrated motion compensation[J].IEE Proc.-Radar SonarNavig.2006, 153(3):301-310 -
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