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针对TanDEM-X卫星计划,重点分析其在一个轨道周期内的测高性能的变化情况。首先从建立双星HELIX构形的HILL方程出发,分析了一个轨道周期内直接影响干涉测高的有效基线,包括顺轨和交轨基线的影响,然后讨论了系统相关系数及其对干涉相位误差的影响,通过建立相对高程误差模型,进一步分析了系统相对高程精度。最后计算机仿真结果验证了分析的正确性。
For the TanDEM-X satellite program, the focus is on analyzing its altimetry performance over a single orbital period. Firstly, based on the HILL equation of constructing the double star HELIX configuration, an effective baseline that directly affects the interfering altimetry in a orbital period is analyzed, including the influence of the baselines on the cross-track and the cross-over. Then, the correlation coefficient of the system and its influence on the phase error Influence, through the establishment of relative elevation error model, further analysis of the system relative elevation accuracy. The final computer simulation results verify the correctness of the analysis.