钟组守时性能分析

Atomic Clock Ensemble Configuration and Performance Analysis

针对原子钟的技术指标,对比分析了不同钟组配置的时标性能。根据典型原子钟的技术指标和实际运行情况对氢钟和铯钟钟差数据进行仿真,应用ALGOS算法计算了铯钟组、氢钟组、氢铯联合钟组的原子时标,从时间偏差、时间稳定度、频率偏差、频率稳定度四个方面考察了钟组时标性能。结果表明,180台仿真铯钟的守时天频率稳定度相当于1台氢钟的守时天频率稳定度;由于铯钟频率稳定度与氢钟相差较大,原子时计算过程中,铯钟权重远低于氢钟,对原子时的贡献有限;氢钟占比高的钟组,时标稳定性较好,溯源状态下时间偏差和频率偏差也较小。时标稳定性好的钟组在守时状态下的时间保持能力也更好。

The time scale performance of different clock ensemble configurations is compared and analyzed concerning the technical specifications of atomic clocks.Simulations of hydrogen maser and cesium clock differential data were performed based on the technical specifications and actual operation of typical atomic clocks.The atomic time scales of the cesium clock ensemble,hydrogen clock ensemble,and combined hydrogen-cesium clock ensemble were calculated by applying the ALGOS algorithm,and the clock ensemble time scale performance was examined in four aspects:time deviation,time stability,frequency deviation,and frequency stability.The results showed that the frequency stability of the clock ensemble of 180 cesium clocks is equivalent to the frequency stability of 1 hydrogen maser.Due to the large difference between the frequency stability of cesium clocks and hydrogen masers,the weight of cesium clocks is much lower than that of hydrogen masers in the atomic time calculation process,and the contribution to the atomic time is limited.The clock ensembles with a high proportion of hydrogen maser have better time scale stability,and the time deviation and frequency deviation in the traceability state are also smaller.The clock ensembles with good time scale stability also have better timekeeping ability in the timekeeping state.