Research on an improved time scale algorithm of hydrogen masers and cesium atomic clocks

In this letter, the author presents a time scale fusion method based on improved exponential filtering and V-C filtering. Firstly, the minimum error theory is used to dynamically estimate the frequency drift parameters of the hydrogen maser, and the exponential filtering method is used to generate the full hydrogen clock time scale. Secondly, an improved weighted average algorithm is used to generate the cesium species time scale. Finally, based on the principle of least squares, the V-C filter is designed to improve the short-term performance of the time scale of cesium clock ensemble by utilizing the rate information of the hydrogen masers, and the comprehensive time scale of hydrogen masers and cesium atomic clocks is obtained. The experimental results show that the time scale has a stability of 1.60e-15 for one hour and 3e-15 for one day, which are superior to the performance of all hydrogen masers or cesium atomic clocks on the same average time scale.