分布式卫星干涉SAR测速误差分析  

Error Analysis for Distributed-Satellite INSAR Measurements of Ground Moving Targets' Velocity

作　　者：余慧[1,2] 王岩飞[1] 耿旭朴[1,2] 闫鸿慧[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100039

出　　处：《电子与信息学报》2010年第6期1497-1500,共4页Journal of Electronics & Information Technology

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。In the application of distributed-satellite INSAR system for velocity-measurement of ground moving targets,due to the satellite cluster＇s flying around,the flying tracks of all satellites are not parallel and their velocity vectors are different.This may cause the along-track baseline＇s time-variety,affect the interferometric phase map and result in velocity and position measurement errors.This paper analyzes the cluster＇s 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.

关 键 词：分布式卫星 编队飞行 沿航迹干涉 误差分析 

分 类 号：TN959.74[电子电信—信号与信息处理]