Accurate Fourth-Order Doppler Parameter Estimation Approach for Geosynchronous SAR

Konferenz: EUSAR 2012 - 9th European Conference on Synthetic Aperture Radar
23.04.2012 - 26.04.2012 in Nuremberg, Germany

Tagungsband: EUSAR 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Zhao, Bingji; Qi, Xiangyang; Yu-Kai, Deng; Wang, Robert; Song, Hongjun (Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)

Geosynchronous Earth orbital Synthetic Aperture Radar (Geo-SAR) is characterized by short revisit cycle and large observe swath, and thus shows potential for different applications such as frequent monitoring, ultra wide swath imaging, and natural risks prevention. As it has an orbital altitude about 35,790 km, the Doppler parameter estimation method of Geo-SAR is different from any other low Earth orbital SAR(Leo-SAR) systems. To deal with the problems caused by long integration time and the Earth rotation, the paper presents a straightforward fourth-order Doppler parameter estimation approach which can address Geo-SAR and the orbital eccentricity and the ellipsoidal earth model are both considered in the algorithm. At last, the influence of satellite attitude errors is analyzed based on the theory, and the differences of Doppler characteristic between Leo-SAR and Geo-SAR are put forward.