利用单个地面控制点的SAR图像高精度立体定位

Accurate Positioning with Stereo SAR Images and One Ground Control Point

几何构像模型和定向参数解算方案的选择是实现SAR图像高精度立体定位的关键。该文针对稀少控制下斜侧视SAR图像高精度定位难题,设计了利用单个地面控制点的SAR图像立体定位方案。该方案利用轨道参数获取成像瞬间天线相位中心的位置、速度,并利用一个地面控制点标定近距延迟和多普勒中心频率,实现定向参数的精确解算和SAR图像的高精度立体定位。采用中国测绘科学研究院获取的机载SAR图像进行了立体定位实验,统计分析了其定位误差,验证了该文方法的精确性和有效性。

Geometrical imaging models and calculations of orientation parameters are the main factors affecting the positioning of stereo Synthetic Aperture Radar （SAR） images. For accurate positioning with squint stereo SAR images and less Ground Control Points （GCPs）, a positioning algorithm with one GCP is designed. In this algorithm, the position and velocity of the radar antenna phase center are derived using orbit parameters, and the close range and Doppler centroid of the SAR images are compensated by one GCP. Thus, accurate orientation parameters are obtained and accurate positioning with stereo SAR images is completed. Airborne SAR images acquired by the Chinese Academy of Surveying and Mapping are used in experiments. The positioning errors of the checkpoints are calculated and analyzed, and it verified the accuracy and effectiveness of the proposed method.