基于精密星历的北斗卫星广播星历精度分析

摘要

T he accuracy of broadcast ephemeris directly determines the accuracy of user navigation and positioning .It is not only issues the real-time user concerns ,but also an im-portant indicator of system builders for inspected system service level . The principle and method to evaluate the accuracy of broadcast ephemeris ,by using precise ephemeris and SLR measurements ,are introduced .On this basis ,the accuracy of Beidou satellite broadcast e-phemeris is assessed by using the precise ephemeris ,and is checked with some SLR measure-ments .Analysis shows that :the broadcast ephemeris radial distance error for Beidou satel-lite is better than 1 m .%卫星广播星历的精度直接决定用户导航定位的精度。它既是实时用户关心的问题，也是系统建设者检验系统服务水平的重要指标。本文介绍了事后精密星历和卫星激光测距观测量评估广播星历精度的原理和方法，采用事后精密星历评估广播星历的精度，利用激光测距观测量进行精度检核。分析表明：北斗卫星广播星历的视向距离误差优于1m．