星载SAR多普勒质心估计的改进方法

本文基于星载合成孔径雷达（SAR）多普勒质心估计的原理，提出估计多普勒质心的能量均衡逼近法，它改进了杂波锁定法的算法结构，减小了估计的运算量；同时还提出距离向加权拟合法，有效地改善了估计精度；最后利用星载SEASAT－ASAR原始数据，证明了这两种新方法的优越性。

Improved doppler Centroid Estimation for Spaceborne SAR Data

The doppler centroid is one of the most important parameters used in spaceborne Synthetic Aperture Radar(SAR)imaging.This paper analyzes the basic principle of Doppler Centroid Estimation (DCE),and presents two new DCE methods, one is Energy balance Approaching method,the other is range dimension Weighted fitting method,The former modifies the operating structure of clutterlock method which is widely used now, as a result, a great deal of computation for DCE is saved. The later is devoted to improve the accuracy of DCE. Then, the advantages of above-mentioned new methods are verified by the experimetn results of spaceborne SEASAT-SAR raw data.