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Front. Inform. Technol. Electron. Eng.  2011, Vol. 12 Issue (5): 404-416    DOI: 10.1631/jzus.C1000170
    
Effect of orbital errors on the geosynchronous circular synthetic aperture radar imaging and interferometric processing
Lei-lei Kou*,1,2, Xiao-qing Wang1, Mao-sheng Xiang1, Jin-song Chong1, Min-hui Zhu1
1 National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Beijing 100190, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100190, China
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Abstract  The geosynchronous circular synthetic aperture radar (GEOCSAR) is an innovative SAR system, which can produce high resolution three-dimensional (3D) images and has the potential to provide 3D deformation measurement. With an orbit altitude of approximately 36 000 km, the orbit motion and orbit disturbance effects of GEOCSAR behave differently from those of the conventional spaceborne SAR. In this paper, we analyze the effects of orbit errors on GEOCSAR imaging and interferometric processing. First, we present the GEOCSAR imaging geometry and the orbit errors model based on perturbation analysis. Then, we give the GEOCSAR signal formulation based on imaging geometry, and analyze the effect of the orbit error on the output focused signal. By interferometric processing on the 3D reconstructed images, the relationship between satellite orbit errors and the interferometric phase is deduced. Simulations demonstrate the effects of orbit errors on the GEOCSAR images, interferograms, and the deformations. The conclusions are that the required relative accuracy of orbit estimation should be at centimeter level for GEOCSAR imaging at L-band, and that millimeter-scale accuracy is needed for GEOCSAR interferometric processing.

Key words： Geosynchronous circular synthetic aperture radar (GEOCSAR)      Orbit error      Imaging      Interferometric processing     
Received: 26 May 2010      Published: 09 May 2011
CLC:  TN957.52  
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Lei-lei Kou
Xiao-qing Wang
Mao-sheng Xiang
Jin-song Chong
Min-hui Zhu
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Lei-lei Kou, Xiao-qing Wang, Mao-sheng Xiang, Jin-song Chong, Min-hui Zhu. Effect of orbital errors on the geosynchronous circular synthetic aperture radar imaging and interferometric processing. Front. Inform. Technol. Electron. Eng., 2011, 12(5): 404-416.

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http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C1000170     OR     http://www.zjujournals.com/xueshu/fitee/Y2011/V12/I5/404


Effect of orbital errors on the geosynchronous circular synthetic aperture radar imaging and interferometric processing

The geosynchronous circular synthetic aperture radar (GEOCSAR) is an innovative SAR system, which can produce high resolution three-dimensional (3D) images and has the potential to provide 3D deformation measurement. With an orbit altitude of approximately 36 000 km, the orbit motion and orbit disturbance effects of GEOCSAR behave differently from those of the conventional spaceborne SAR. In this paper, we analyze the effects of orbit errors on GEOCSAR imaging and interferometric processing. First, we present the GEOCSAR imaging geometry and the orbit errors model based on perturbation analysis. Then, we give the GEOCSAR signal formulation based on imaging geometry, and analyze the effect of the orbit error on the output focused signal. By interferometric processing on the 3D reconstructed images, the relationship between satellite orbit errors and the interferometric phase is deduced. Simulations demonstrate the effects of orbit errors on the GEOCSAR images, interferograms, and the deformations. The conclusions are that the required relative accuracy of orbit estimation should be at centimeter level for GEOCSAR imaging at L-band, and that millimeter-scale accuracy is needed for GEOCSAR interferometric processing.

关键词： Geosynchronous circular synthetic aperture radar (GEOCSAR),  Orbit error,  Imaging,  Interferometric processing 
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