导航卫星接收机钟差和信号传播时延对几何距离的影响分析

Analysis of the Influence of Navigation Satellite Receiver Clock Error and Signal Transfer Delay on Geometric Distance

在利用GPS观测量进行轨道确定时，由于接收机钟差和信号传播时延的存在，导致用户只能获取接收机钟面时，接收机接收信号时刻和卫星发射信号时刻都不能精确求定。本文在真天球坐标系下，顾及信号接收和发射时刻的误差以及由此导致的坐标系统的误差，详细推导了接收机钟差和信号传播延迟对几何距离的影响。通过实际的计算表明，当接收机钟差在1ms时导致距离误差在分米量级；信号时延导致的误差可达几十米。

In the process of the satellite orbit determination by using GPS observations, the users only can obtain and can not obtain the receiver＇s clock face time, the accurate time of receiving and transmitting signal is not accurate to get at all times because of the existence of the receiver clock error and signal transfer delay. In this paper, the influence of receiver clock error and signal transfer delay on geometric distance are deduced in instantaneous celestial coordinate system. At last, an example demonstrates that the ranging error owing to the receiver clock error can reach several decimeters when the receiver clock error in 1 millisecond and the ranging error owing to the signal trans- fer delay can reach several - decade meters.