Cesium clocks are the core components of high-precision timekeeping applications,and their performance significantly affects the stability and accuracy of the entire timekeeping system.After introducing the main performance indexes and evaluation methods of cesium clocks,the fre-quency stability,frequency accuracy,frequency drift rate and predictability of the new TA2000 ce-sium clock are systematically analysed.The results show that compared with imported cesium clocks,the new domestic cesium clock has higher short-term and medium-term stability,compara-ble long-term stability,but there's still a gap between the relative frequency deviation and frequen-cy drift of the new domestic cesium clock and that of the imported cesium clock.Specifically,the frequency accuracy of the new cesium clock exceeds 6.5 × 10-13,while the frequency stability is better than 2 × 10-14/d,and the frequency drift rate is better than 6.5 × 10-15/d(results of 32 days of continuous measurement).In terms of predictability,the root mean square error of the 5-day prediction of the new cesium clock is less than 5 ns.The performance analysis of the new do-mestic optically pumped cesium clock can provide a data reference for its entry into the group sys-tem of timekeeping clocks.
维普
万方数据