地月空间星地双向单程测量高精度模型

A High-precision Model of Dual One-way Ranging in the Cis-lunar Space

针对使用星地双向单程测量技术实现给定场景下的地月空间高精度测量问题,建立了地月空间纳秒级星地时差解算模型与米级瞬时距离解算模型,定量分析了模型中各因素的量级,并对模型中收发时延、引力时延、定轨误差和大气延迟等多种因素引入的时差和距离估算误差进行了定量分析。仿真数据的处理结果校验了误差量级理论分析的准确性,时差估算的均方根误差优于7.6ns,瞬时距离估算均方根误差优于2.4 m。建立的模型可以对地月空间星地DOWR测量数据进行高精度处理,实现地月空间高精度时间比对,支持未来中国载人登月等任务及地月空间高精度导航技术。

Aiming at the problem of using the space-Earth dual one-way ranging(DOWR)technology to realize the high-precision measurement under a given scenario in the cis-lunar space,the models for calculating the time difference between space and earth in nanoseconds and for calculating the instantaneous distance in meters are established.The magnitude of each factor in the model is quantitatively analyzed,and the time difference and distance estimation errors introduced by many factors in the model,such as transceiver delay,gravitational delay,orbit determination error and atmospheric delay are quantitatively analyzed.The simulation data processing results verify the accuracy of the theoretical analysis of the magnitude of error.The root mean squared errors of time difference estimation and instantaneous distance estimation are better than 7.6 ns and 2.4 m,respectively.The established models can perform high-accuracy processing of lunar orbiter to ground DOWR measurements,and support high-accuracy time transfer experiments for future China’s manned lunar exploration project and other missions and high-accuracy navigation technology in the Cis-lunar space.