SAR-GMTI构型下分布式小卫星误差估计方法  

Error Estimation Method for Distributed Small Satellites in the Configuration for SAR-GMTI

作　　者：徐青[1] 廖桂生[1] 张娟[1] 杨志伟[1] 

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

出　　处：《电子学报》2011年第4期848-853,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60736009;No.60825104);长江学者和创新团队发展计划(No.IRT0954)

摘　　要：针对合成孔径雷达(SAR)成像、地面动目标检测(GMTI)功能的实现,分布式小卫星的最佳构型为沿航向分布,但误差的存在会使性能下降.提出了一种基于距离脉压后时间-方位多普勒域回波数据的分布式小卫星误差估计方法.通过距离向脉压,提高了信噪比,采用预先估计并补偿幅度误差的方法,克服了幅度误差与沿航向位置误差的相互影响.仿真结果表明,与传统方法相比,本文方法收敛速度加快,估计精度得到提高.To realize the function of the synthetic aperture radar（SAR） image and ground moving target indication（GMTI）,the along-track array is the best configuration for the distributed small satellites.However,array errors significantly degrade the performances.An estimation method based on the data in compressed range time and azimuth Doppler domain is given.In the proposed method,the range pulse compression is used to improve the signal to noise ratio.And the gain error is corrected before the other error estimations which avoids the interaction between the gain error and the along-track position error.Computer simulations show that the convergence rate of the proposed method is quickened with the estimate accuracy improved,compared with the conventional method.

关 键 词：分布式小卫星 地面动目标检测 合成孔径雷达 误差校正 

分 类 号：TN957.51[电子电信—信号与信息处理]