基于景象匹配与惯导信息的SAR平台定位方法

利用高度传感器提供高度信息，结合高精度异源图像匹配技术与惯导系统漂移修正方法实现了SAR平台定位。根据成像中间时刻SAR平台与SAR图像中心线上物点在水平面的投影共线的特性，在单帧图像中心线上均匀选取若干点与光学基准图进行高精度景象匹配，计算平台在水平面上投影位置，并利用高度信息确定其空间位置；再使用序列图像定位结果估计惯导系统漂移参数，对惯导系统输出的位置数据进行修正，实现高精度的SAR平台定位。对各误差因素的影响进行了分析，推导了精度估计公式。仿真和实际序列图像实验结果表明，方法正确可行，平台定位精度较高，具备一定工程实用价值。

SAR Platform Location Method Based on Scene Matching and INS Information

Aided by elevation information provided by height sensor, Synthetic Aperture Radar (SAR) platform geo-location is realized combining high precision image matching and Inertial Navigation System (INS) drift correction method. According to that the platform is on the centerline of SAR image at the imaging central time, some points on the centerline of a single image are equably selected as control points whose spatial position can be obtained by high precision matching with optical reference image, and the SAR platform is positioned aided by elevation information. By use of position results of sequence images, the drifting parameters of INS are estimated and then the outputting position data is corrected to achieve high accuracy platform geo-location. The impact of different errors on location precision is analyzed and the precision estimation formulas are derived. Both simulation and real data test results show accuracy, high precision and practical value for engineering of the proposal method.