BDS广播星历组间位置偏差分析

通过分析星历组间位置偏差的时序变化评估BDS区域卫星导航系统的广播星历性能。文中详细分析了不同广播星历龄期(IODE)和不同的轨道类型(GEO、IGSO和MEO)之间星历组间偏差的差异,结果显示:广播星历组间位置偏差对用户的平均影响约为0.23m;各卫星径向方向偏差最小;对于GEO和IGSO卫星,地影期间会带来较大的组间位置偏差;IODE更新规律的不同会引起组间偏差的差异。

Analysis of positional discontinuity of BDS broadcast ephemeris

In order to explore the performance of BDS broadcast ephemeris, the variations of difference satellite positions between successive hourly broadcast ephemeris are analyzed, and the comparison of satellite's type and issue of ephemeris are discussed.The results show that the difference accuracy of BDS broadcast ephemeris in the radial is least and the average influence for users is 0.23m.GEO and IGSO satellites often display the most problematic behavior during eclipsing periods.The variety of IODE will bring the diversity of the difference satellite positions.