分布式卫星SAR系统时变基线补偿方法  

Time-varying baseline compensation for distributed-satellite SAR systems

作　　者：束宇翔[1] 廖桂生[1] 杨志伟[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2011年第9期1978-1982,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60901066;60825104);长江学者和创新团队发展计划(IRT-0954);国防预研基金(9140C0101081001);中央高校基本科研业务费专项资金(10000902013)资助课题

摘　　要：针对分布式卫星合成孔径雷达(synthetic aperture radar,SAR)系统中星间基线时变导致高程干涉相位补偿困难和SAR图像对相干性下降的问题,从分布式卫星SAR系统的观测几何构型出发,提出了一种时变基线补偿方法。该方法采用总体最小二乘法拟合航迹方程,并依据方程参数重构虚拟的平行航迹,通过补偿原航迹和新航迹上的观测波程差获得等效的固定基线回波数据。仿真实验表明,采用该方法进行时变基线补偿后,能有效提高SAR图像对的相干性和地面动目标检测(ground moving target indication,GMTI)性能。The time varying baseline in distributed satellite synthetic aperture radar （SAR） systems makes it difficult to compensate the terrain interferometric phase and causes the coherence of the pair of SAR images to descend. For the purpose of overcoming the influence of the time varying baseline, a compensation method based on the geometrical configuration of distributed-satellite SAR systems is proposed. The total least square algorithm is applied to fit the track equations of the satellites. Then a new virtual parallel track is constructed with the parameters of the track equations. An equivalent constant baseline is obtained by the compensation of the path difference between the new and the original tracks. Simulation results illustrate that the coherence of the pair of SAR images and the performance of ground moving target indication are improved by the time-varying baseline compensation.

关 键 词：分布式卫星 地面动目标检测 时变基线 

分 类 号：TN957[电子电信—信号与信息处理]