基于六自由度定位的SAR阵元位置误差校正

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。

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

T o eliminate the errors of the g round-based synthet ic aperture radar with stepped-frequency modulated cont inuous w aves caused by the yaw ing of the ideal t ime, a method based o n the six-stance electr omag net ic sensit ivity posit io n system w as pr opo sed to measure the precise SAR mot io n t race. T he error in sy stem measur ing distance w as less than 1cm and the ang le error w as less than 1o w hich st ill had influence on SAR imaging. The least square alg orithm w as int ro duced, and the source DOA( dir ect of arr iv al) w as est imated based on the unw rap phase of the steering vector . The sensor posit io n erro r w as dir ectly estimated and revised. Ex tensiv e simulat ion show s that the arr ay senso r posit ion error can be effect ively revised w ithout iter at ive o perat io ns by this method w hich has low er operation complexity and higher est imatio n precision