BD-2在轨卫星钟性能分析

Performance Analysis of In-Orbit BD-2 Satellite Clock

选取3颗不同轨道的BD-2在轨卫星,以其星载主钟某些时段测量的星地无线电双向时间比对钟差数据为基础,计算频率准确度、稳定度和漂移率。结果表明,BD-2在轨卫星钟的频率准确度优于10^(-11)量级,频率稳定度优于10^(-13)量级,频率漂移率优于10^(-14)量级。其中,GEO-1卫星即将到达系统的设计运行寿命,但其卫星钟的各项性能指标计算结果均符合设计要求,未影响北斗二号系统的服务质量。

Three BD-2 satellites in different orbits are analyzed in this paper.Based on the clock bias of two-way satellite-ground time comparison by wireless radio in some periods,the frequency accuracy,stability and drift of their primary atomic clocks are calculated.The results indicate that their frequency accuracy,stability and drift are respectively better than 10 11,10 13 and 10 14,respectively.In addition,for the GEO-1 satellite,the performance of atomic clock meets the design requirements and is still healthy enough to not influence the service quality of the BD-2,even as it is about to reach its projected lifespan.