基于六自由度定位的SAR阵元位置误差校正  

SAR motion compensation based on six-stance electromagnetic sensitivity position system

作　　者：周许申[1] 陈彬[1] 盛卫星[2] 殷勤[1] 汪莹[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007 [2]南京理工大学电光学院,江苏南京210094

出　　处：《解放军理工大学学报（自然科学版）》2010年第3期243-248,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60671007)

摘　　要：为了能够消除采用阶跃调频连续波体制的地面合成孔径雷达(GB-SAR)由于偏离理想航线产生的误差,提出了一种基于六自由度电磁敏感度定位系统测量SAR精确航线的方法,对雷达自身的位置进行定位、校正。使系统定位距离误差小于1 cm,角度误差小于1,°但仍然对成像效果有一定影响。因此,对于由定位系统产生的阵元误差采用对信号导向矢量的绝对相位进行最小二乘线性拟合,进而估计出阵元位置误差的方法,并对其进行校正。仿真的成像结果表明,不需迭代运算即可完成对阵元位置误差的有效校正,具有较低的运算复杂度和较高的估计精度。To eliminate the errors of the ground-based synthetic aperture radar with stepped-frequency modulated continuous waves caused by the yawing of the ideal time,a method based on the six-stance electromagnetic sensitivity position system was proposed to measure the precise SAR motion trace.The error in system measuring distance was less than 1cm and the angle error was less than 1o which still had influence on SAR imaging.The least square algorithm was introduced,and the source DOA（direct of arrival） was estimated based on the unwrap phase of the steering vector.The sensor position error was directly estimated and revised.Extensive simulation shows that the array sensor position error can be effectively revised without iterative operations by this method which has lower operation complexity and higher estimation precision.

关 键 词：六自由度 电磁敏感定位系统 合成孔雷达 阵元误差 

分 类 号：TN957.52[电子电信—信号与信息处理]