GNSS广播星历的精度评定

The Precision of GNSS Broadcast Ephemeris

由于卫星广播星历有能被用户实时观测到的特点,因此为导航和实时定位提供了方便。精密星历是高精度的事后星历,而广播星历是由全球定位系统的地面控制部分所确定和提供,并经过卫星向全球用户公开播发的一种预报星历。本文选取了GPS和GLONASS卫星系统,并对GPS和GLONASS广播星历与精密星历计算的卫星位置对比分析,最后得出广播星历的精度与卫星和原子钟的类型有关的结论。

Satellite broadcast ephemeris can be obtained by observation real -time, It is very convenient the navigation and real -time location.The precise ephemeris is afterwards ephemeris , while the broadcast ephemeris is global positioning system ground control to identify and provide the part and through satellite to the global public broadcast of a forecasting ephemeris , This paper only chooses GPS and GLONASS satellite system due to space limitations , Through the satellite position calculation for GPS and GLONASS broad-cast ephemeris and precise ephemeris and then make the different between them .In conclusion , the broadcast ephemeris precision has something to do with the type of the satellite and the type of the atomicclock .