Optimal Doppler centroid estimation for spaceborne SAR data from a nonhomogeneous scene

Hong Xiong; Guoqing Liu; ShunJi Huang

doi:10.1117/12.197550

21 December 1994 Optimal Doppler centroid estimation for spaceborne SAR data from a nonhomogeneous scene

Hong Xiong, Guoqing Liu, ShunJi Huang

Proceedings Volume 2316, SAR Data Processing for Remote Sensing; (1994) https://doi.org/10.1117/12.197550
Event: Satellite Remote Sensing, 1994, Rome, Italy

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.

Citation Download Citation

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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