SAR影像立体定位中的测距误差分析

Ranging Error Analysis in Stereo Location of SAR Images

合成孔径雷达（SAR）是微波测距成像系统，两次观测同一地区的SAR影像可以构成立体像对，从立体影像同名像点的左右视差可以获得相应地面点的高程信息。立体SAR测图包括后方交会与前方交会两个步骤，本文针对近距离边相对误差对立体测图的影响，分析了近距离边的相对误差特性和消除方法。试验证明，本文提出的相对误差改正方法能够有效提高立体SAR定位精度。

Synthetic aperture radar （SAR） is a microwave ranging imaging system. The SAR images of the same area in two observations can form a stereo image pair, and the elevation information of the corresponding ground points can be obtained from the right and left parallax of corresponding image points in the stereo image pair. The stereo SAR mapping includes two steps： backward intersection and forward intersection. Based on the influence of relative error at close range distance on stereo mapping, the relative error characteristics and elimination methods are analyzed in this paper. The test results show that the relative error correction method proposed in this paper can effectively improve the positioning accuracy of stereo SAR.