基于伪距信息的COMPASS-MEO导航卫星单星定轨分析

COMPASS-MEO导航卫星的伪距观测量包含星站距离、接收机钟差和卫星钟差以及各种噪声。本文首先分析了接收机钟差和卫星钟差在一定间隔内主要表现为线性变化的特性，可以考虑将接收机和卫星钟差作为测距的偏差和偏差变化率和轨道一起进行求解。其次，利用实测的MEO导航单星伪距数据，进行了数据预处理和定轨试验，分别对站间无时间同步信息和有时间同步信息两种情况进行定轨、残差分析和参数解算。使用重叠弧段、轨道预报和激光观测数据验证定轨结果的精度。结果表明，两种情况下的定轨结果无明显差别。该定轨方法可以运用于MEO导航单星精密轨道的计算。

Analysis of Orbit Determination of COMPASS-MEO Navigation Satellite with Pseudorange

The pseudorange of COMPASS-MEO navigation satellite is composed of the distance between satellite and station, receiver＇s clock error, satellite＇s clock error and all kinds of noise. It is firstly analized that the receiver＇s clock error and satellite＇s clock error are linear with time at intervals, and the receiver＇s clock error and satellite＇s clock error can be considered as distance bias and bias drift during orbit determination. In this way, the actural pseudorange data of COMPASS-MEO navigation satellite is pre-proeessed and the orbit determination is tested with the synchronous time information and non-synchronous time information in the paper. The orbit determination precision is verified by cross-arc, orbit prediction and laser data. The results have no obvious difference. It is suggested that the method can be applied in precision orbit determination of a single MEO navigation satellite.