航空学报 > 2003, Vol. 24 Issue (6): 537-540

一种改进的PGA最大似然相位估计法

钟睿, 毛士艺   

  1. 北京航空航天大学203教研室 北京 100083
  • 收稿日期:2002-11-13 修回日期:2003-02-20 出版日期:2003-12-25 发布日期:2003-12-25

A Modified PGA ML Phase Estimation Method

Zhong Rui, Mao Shi-yi   

  1. Faculty 203; Beijing University of Aeronautics and Astronautics; Beijing 100083; China
  • Received:2002-11-13 Revised:2003-02-20 Online:2003-12-25 Published:2003-12-25

摘要: 讨论了合成孔径雷达( Synthet ic Aper ture Radar ) SAR) 成像处理过程中一种不需要直接求解矩阵特征值及其特征向量, 但仍然基于最大似然估计的应用于相位梯度自聚焦算法( Phase Gr adient Algorithm)PGA) 中的相位估计方法, 且主要从计算量及数据处理精度等方面与传统的特征向量方法相比较。结果表明,这种基于迭代方法计算特征向量相位的算法在SAR 成像自聚焦过程中具有实用意义。

关键词: SAR, 自聚焦, 相位梯度, 最大似然, 特征向量

Abstract: The method of phase estimation in SAR motion compensation is presented, which, based on the eigen-vector method, eliminates the solution of eigen2values and the corr espondence eigen-vectors. Some compar isons hasbeen made with the tradit ional eigen-vector method on operation intensity and processing pr ecision. The results indicate that this iterated phase est imator is pr actical in SAR autofocus procedure.

Key words: SAR, autofocus, PGA, ML, eigenvector

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