A New Joint Time Scale Method of Hydrogen Maser and Cesium Atomic Clock

The fusion method of hydrogen maser and cesium atomic clock is mainly to study the effective combination of two different types of atomic clock to produce a more stable and accurate time scale. In this paper, the time scale fusion method of cesium clock and hydrogen maser based on Vondrak-Cepek filtering is studied, and the preliminary results are obtained. The clock difference data of three cesium clocks and three hydrogen masers are taken as research objects. First, the improved weighted average algorithm is used to generate the time scale of cesium clocks. the exponential filtering method is used to establish the time scale of hydrogen masers. Secondly, the key parameters of Vondark-Cepek combined filtering are selected according to the least square principle. Finally, the performance of the time scale of cesium clock ensemble is enhanced by the differential information of the time scale of hydrogen maser ensemble, and the time scale of hydrogen-cesium fusion is obtained. The results show that this method can effectively utilize the short-term stability of hydrogen maser and the long-term stability of the cesium clock. And the stability reaches 3.8e-15 in 1 h and 3.4e-15 in 5 d, which are superior to the corresponding time scales of the cesium clocks and the hydrogen masers, and the combined time scales of hydrogen masers and cesium clocks produced by AT1 and ALGOS algorithm respectively.