1.航天工程大学 电子与光学工程系 北京;2.北京航天飞行控制中心 北京
科技委基础加强计划(2019-JCJQ-JJ-134)
1.Space Engineering University;2.Beijing Aerospace Flight Control Center
对流层延迟是深空干涉测量的重要误差源之一，当前主要采用天顶延迟与映射函数进行建模。本文首先分析了温度、湿度、压强等气象参数对Saastamoinen天顶延迟模型的影响，得到了各参数的影响幅度，并给出了一定对流层延迟精度对气象参数精度的要求；然后，对比分析了NMF和VMF在不同仰角时的映射幅度偏差，结果表明，当仰角高于10°时，映射函数幅度偏差小于0.005。但NMF由于形式简洁，计算量低，更加适用于深空干涉测量。气象参数的测量精度影响、映射模型分析为气象参数测量精度指标设计、映射函数适用性选择提供依据。
Tropospheric delay is one of the important error sources of deep space interferometry.In this paper, the influence of temperature, humidity, pressure and other meteorological parameters on Saastamoinen zenith delay model is firstly analyzed, and the influence amplitude of each parameter is obtained, and the requirements of certain tropospheric delay accuracy on the accuracy of meteorological parameters are given.Then, the mapping amplitude deviation of NMF and VMF at different elevation angles is compared and analyzed. The results show that when the elevation Angle is higher than 10°, the mapping amplitude deviation is less than 0.005.However, NMF is more suitable for deep space interferometry because of its simple form and low computational cost.The influence of meteorological parameters on measurement accuracy and the analysis of mapping model provide basis for the design of meteorological parameters measurement accuracy index and the selection of mapping function applicability.
