利用GEO卫星进行转发式授时的性能分析

The Performance Analysis of Using GEO Satellite to Execute the Repeater Time Service

利用GEO卫星进行转发式授时的原理,将监测得到的授时偏差结果与卫星广播的星历信息进行比对分析,对卫星的解算星历和广播星历进行分析,分析结果说明:当卫星运动到赤道上方时,z方向的运动加速度最小,速度最大,星历预报误差最大,卫星径向距离偏差最大,此时授时偏差最大;卫星从赤道上方运动到南北两端过程中,z方向的运动加速度逐渐增大,速度逐渐减小,星历预报误差逐渐变小,卫星运动到南北两端时,z方向的运动加速度最大,速度最小,星历预报误差最小,卫星径向距离偏差最小,此时授时偏差最小。

This paper introduces the principle of using GEO satellite to execute the repeater time service,compare and analysis between the time service error result and the satellite broadcast ephemeris information,analysis the satellite＇s solver ephemeris and broadcast ephemeris.The result illustrates that when the satellite moves to the top of the equator,it has the minimum motion acceleration in the zdirection,the maximum speed,the maximum ephemeris prediction error and the maximum deviation of radial distance,so it has the maximum time serves error at this time.When the satellite motions from above the equator to the north and south ends,its motion acceleration in the z direction has gradually increases,the speed has gradually decreases,the ephemeris prediction error has gradually decreases.When the satellite moves to the north and south ends,it has the maximum motion acceleration in the z direction,the minimum speed,the minimum ephemeris prediction error and the minimum deviation of radial distance,so it has the minimum time service error at this time.