影响奔月飞行器定轨精度的误差源分析

以探月工程为背景，讨论在现有测控网分布、观测弧段以及尽可能接近真实情况的误差源等前提下，利用仿真模拟方法对影响奔月飞行器定轨精度的误差源进行分析。重点考察了观测量精度、初始时刻先验轨道误差、测量船点位误差以及观测资料类型等对奔月飞行器定轨精度的影响。结果表明提高观测量精度和减小测量船点位误差将有助于提高定轨精度，以及采用USB测距、测速和VLBI时延、时延率联合定轨能够提高定轨和轨道预报精度。

Analysis of Error Sources for Trans-lunar Spacecraft Orbit Determination

In light of the coming Chinese Lunar Exp lo ration Project, the paper discusses error sources that would affect the orbital determination accuracy of the trans-lunar spacecraft such as the distribution o f the TT&C network, the observation arcs and both systematic and random measurem ent noise. The method used is simulation. In addition, observation accuracy, pri ori orbital errors, errors of instrumentation ship and observation data types ha ve been investigated primarily for the orbital determination accuracy of the tra ns-lunar spacecraft. Raising observation accuracy and reducing errors of instru mentation ship would improve accuracy of orbit determination,and adopting the o bservation types with USB ranging,ranging rate and VLBI delay, delay-rate would also improve accuracy of orbit determination and orbit prediction.