时差定位型卫星铷钟的双钟热备份设计

针对传统星载铷钟备份设计中对铷钟状态判断不准确和主备切换时输出信号不稳定的不足,在分析时差测算铷钟指标原理和频率信号切换方法的基础上,提出了一种适用于时差定位型卫星铷钟的双钟热备份设计,通过GPS时差测算铷钟频率性能指标,以及无扰切换设计实现频率信号的稳定输出。地面试验表明,铷钟的准确度和稳定度指标测算误差小于5%,频率输出信号在切换时连续稳定,无突波干扰。研究结果可以为后续定位型卫星和导航卫星的高精度时频系统设计提供参考。

Design of Hot Standby System of Dual Rubidium Clock for Time-difference Positioning Satellite

To make up the shortage of the correct judgement of clock state and the stability of switching the clocks of the traditional design of stand-by on-board rubidium clock, a design of dual rubidium clock with hot standby capability used for the time-difference satellite is proposed in the paper, which is based on the analysis of computing the rubidium clock frequency performance by time-difference and switching method of frequency signal. A stable output of frequency signal is accomplished by switching without phase disturbance, and on-board rubidium frequency performance is calculated through GPS time-difference. The ground test shows that, the frequency accuracy and sta- bility computing error of rubidium clock are within 5 %, maintaining continuous and stable output without disturbance while switching frequency signal. The design can be a reference for future high-accuracy time-frequency system design of positioning satellite and navigation satellite.