干涉Cartwheel获取高精度DEM的联合校准技术

干涉Cartwheel能利用编队卫星间的空间基线进行干涉测高,并通过干涉定标技术获取精确的数字高程模型。现有的干涉定标技术不能充分利用干涉Cartwheel的空间编队构形,且受空间测量手段的限制,编队构形的获取精确度低,利用起来难度较大。文中首先利用干涉Cartwheel的几何构形,建立了编队构形误差和平台系统参数误差之间的关系,然后联立各干涉平台的敏感度方程,利用空间构形误差和参数误差的互相耦合,一次对各干涉平台获取的数字高程模型进行地形联合校准。仿真结果表明了该算法的有效性。

United-calibration Technique for Generating High-precision DEM in the Interferometric Cartwheel

Interferometric cartwheel is an important satellite configuration for distributed satellite system, the baselines between multisatellites can be used for interferometric height measurement, and then high-precision digital elevation map (DEM) can be generated through interferometric calibration. But the information of geometric configuration isn't used by current calibration techniques, and the geometric configuration is hard to get through current measurements. In this paper, the relations between parameter errors and configuration errors are firstly given from the geometric configuration of cartwheel, and then sensitivity equations of each interferometric platform are united. Using the couplings between parameter errors and configuration errors, DEMs from all interferometric platforms can be calibrated within one scaling procedure. The simulation results show the effectiveness of this algorithm.