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从干涉合成孔径雷达(InSAR)测高精度需求出发,分析整个流程中的综合观测几何,联合InSAR对地观测参数、全球卫星导航系统(GNSS)对编队卫星观测参数和坐标系转换参数,建立了导航卫星的优选准则,理论推导了InSAR高程的误差传播系数。该准则直接针对InSAR高程精度进行优化选星,表征了综合几何关系下基线各分量对测高误差的贡献。仿真结果与理论推导相吻合,并给出了不同卫星导航系统、不同选星个数以及不同InSAR参数配置等多种场景下的结果比对。新准则相比以往基于最小相对精度衰减因子的选星准则,能够更好地反映实际几何关系,从而在相同观测条件下通过卫星优选得到更高的测高精度。
Based on the demand of interferometric synthetic aperture radar (InSAR), the integrated observation geometry in the whole process was analyzed. The observed parameters of InSAR and the parameters of global satellite navigation system (GNSS) Navigation satellite optimization guidelines, the theory derived InSAR elevation error propagation factor. This criterion optimizes the star selection directly for the InSAR elevation accuracy, and represents the contribution of the baseline components to the height error under the comprehensive geometric relationship. The simulation results are in good agreement with the theoretical deductions, and the comparison of results under different scenarios of different satellite navigation systems, different numbers of selected stars, and different configurations of InSAR parameters are given. Compared with the previous selection criteria based on the minimum relative accuracy decay factor, the new criterion can better reflect the actual geometric relationship, and thus obtain higher altitude accuracy by satellite optimization under the same observation conditions.