多子帶融合解動目標徑向速度模糊方法

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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

合成孔徑雷達地面動目指示系統(tǒng)（syntheticapertureradar-ground movingtargetindication，SAR-GMTI在高精度的動目標測速和定位任務(wù)中具有重要作用[1-3]，但易導致動目標徑向速度模糊問題。（剩余14377字）