ESTIMATION OF DOPPLER CENTROID FREQUENCY IN SPACEBORNE SCANSAR  

作　　者：Zou Xiufang Zhang Qunying 

机构地区：[1]Lab 10, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Journal of Electronics(China)》2008年第6期822-826,共5页电子科学学刊（英文版）

摘　　要：Doppler centroid frequency is an essential parameter in the imaging processing of the Scanning mode Synthetic Aperture Radar (ScanSAR). Inaccurate Doppler centroid frequency will result in ghost images in imaging result. In this letter, the principle and algorithms of Doppler centroid frequency estimation are introduced. Then the echo data of ScanSAR system is analyzed. Based on the algorithms of energy balancing and correlation Doppler estimator in the estimation of Doppler centroid frequency in strip mode SAR, an improved method for Doppler centroid frequency estimation in ScanSAR is proposed. The method has improved the accuracy of Doppler centroid frequency estimation in ScanSAR by zero padding between burst data. Finally, the proposed method is validated with the processing of ENVIronment SATellite Advanced Synthetic Aperture Radar (ENVISAT ASAR) wide swath raw data.Doppler centroid frequency is an essential parameter in the imaging processing of the Scanning mode Synthetic Aperture Radar （ScanSAR）. Inaccurate Doppler centroid frequency will result in ghost images in imaging result. In this letter, the principle and algorithms of Doppler centroid frequency estimation are introduced. Then the echo data of ScanSAR system is analyzed. Based on the algorithms of energy balancing and correlation Doppler estimator in the estimation of Doppler centroid frequency in strip mode SAR, an improved method for Doppler centroid frequency estimation in ScanSAR is proposed. The method has improved the accuracy of Doppler centroid frequency estimation in ScanSAR by zero padding between burst data. Finally, the proposed method is validated with the processing of ENVironment SATellite Advanced Synthetic Aperture Radar （ENVISAT ASAR） wide swath raw data.

关 键 词：Spaceborne the Scanning mode Synthetic Aperture Radar （ScanSAR） Doppler centroid frequency Energy balancing Correlation Doppler estimator 

分 类 号：TN957.51[电子电信—信号与信息处理]