分布式卫星干涉SAR测速误差分析
doi: 10.3724/SP.J.1146.2008.00265
Error Analysis for Distributed-Satellite INSAR Measurements of Ground Moving Targets Velocity
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摘要: 在应用分布式卫星干涉SAR进行地面运动目标检测(GMTI)时，由于卫星群的绕飞运动，各小卫星的航迹不完全平行，速度矢量存在差异，导致沿航迹干涉基线长度随时间不断变化，从而影响干涉相位图，带来测速误差和目标定位误差。针对此问题，该文分析了分布式卫星群的实际轨道情况，建立了由基线长度变化导致的测速误差模型，提出了两种可有效消除此误差从而提高测速精度的信号处理方法。最后进行了计算机仿真实验，实验结论证实了文中所提出方法的有效性与准确性。Abstract: In the application of distributed-satellite INSAR system for velocity-measurement of ground moving targets, due to the satellite clusters flying around, the flying tracks of all satellites are not parallel and their velocity vectors are different. This may cause the along-track baselines time-variety, affect the interferometric phase map and result in velocity and position measurement errors. This paper analyzes the clusters actual flying tracks and the influence of non-parallel flying to the ATI-SAR velocity-measurements precision, establishes the velocity-error model caused by non-parallel flying, proposes two novel methods to improve the measurement accuracy and obtain precise measurement. Finally, the simulation experimental results prove the conclusion proposed.
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