多子带融合解动目标径向速度模糊方法

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Multi-subband fusion for radial velocity ambiguity resolution

YANG Zhiwei1，* ，YANG Andong1，LIANG Gengchen1，LI Xianghai1，LI Xiaorui²，LIU Jie² （1. National Key Laboratory of Radar Signal Processing，Xidian University，Xi'an 71o071，China; 2.Instituteof Remote Sensing Satelite ofChina Academy of Space Technology，Beijing10o094，China）

Abstract：A multi-subband coherent fusion de-ambiguity method is proposed to address the issue of increased error probability in solving de-ambiguity problems using methods based on the Chinese Remainder Theorem.Firstly，the proposed method estimates the steering vectors of the moving targets in each frequency band.Then，the method sequentiall solves the focusing transformation matrix at each reference frequency and employs spatial focusing processing to improve the accuracy of radial velocity estimation for the moving targets. Finally，de-ambiguity processng is performed.The results of simulationand real data demonstrate that the proposed method efectively improves the accuracy of radial velocity estimation for moving targets and increases the probability of correctly resolving ambiguities.

Keywords：synthetic aperture radar（SAR）；velocity ambiguity；subband processing；radial velocity estimation；ambiguity resolution

0 引言

合成孔径雷达地面动目指示系统（syntheticapertureradar-ground movingtargetindication，SAR-GMTI在高精度的动目标测速和定位任务中具有重要作用[1-3]，但易导致动目标径向速度模糊问题。（剩余14377字）