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21 December 1994 Optimal Doppler centroid estimation for spaceborne SAR data from a nonhomogeneous scene
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Abstract
Doppler centroid is one of the most important parameters required by spaceborne SAR signal processing, it must be accurately estimated from echo signals themselves in order to perform a fine motion compensation. So far, the clutter-lock method proposed by Li et al. has been most commonly used to estimate this quantity, however, this method operates well only for homogeneous and quasi-homogeneous sources. In this paper, an optimal amplitude correlation approach is presented to estimate Doppler centroid for spaceborne SAR data from a non-homogeneous scene, it includes the following two steps, (1) coarse estimation: spatial amplitude correlation in range-dimension, (2) fine estimation: image amplitude correlation in range-dimension. The effectiveness of this optimal approach is demonstrated with processing spaceborne SEASAT-A SAR data. Compared with the most commonly used clutter-lock method, the improvement of estimation accuracy of non-homogeneous scene is obtained.
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Hong Xiong, Guoqing Liu, and ShunJi Huang "Optimal Doppler centroid estimation for spaceborne SAR data from a nonhomogeneous scene", Proc. SPIE 2316, SAR Data Processing for Remote Sensing, (21 December 1994); https://doi.org/10.1117/12.197550
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