中文摘要：

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。

英文摘要：

Based on the analysis of the integrated observation geometry, a criterion for navigation satellite optimal selection is presented from the perspective of interferometric SAR（InSAR）height precision requirement. The criterion is established by combining the parameters of the InSAR observation, the global navigation satel- lite system（GNSS）-based relative positioning and the coordinate system conversion. The InSAR height error propagation coefficients are also theoretically derived. The new criterion aims at carrying out optimal naviga tion satellite selection directly by InSAR height precision. The error contribution of each baseline component to the height error is also embodied under the integrated geometric relationship. Simulation results agree well with the theoretical derivation. Comparisons are also carried out for a variety of scenarios, such as different GNSS, different number of selected satellites, and different InSAR parameter configurations. Compared with the traditional satellite selection criterion based on minimal relative dilution of precision, the new criterion can reflect the practical geometric relationships more precisely, which may lead to a higher precision of InSAR height acquisition under the same observation conditions through satellite selection.