A PAPER CLOCK MODEL FOR THE CESIUM CLOCK ENSEMBLE OF TL

摘要

A paper clock model based on limited numbers of atomic clocks and a typical time intervalrncounter was developed. The aim of this work is to use a small ensemble of cesium clocks and arntraditional measurement system to generate a time scale keeping both short-term and long-termrnaccuracy. We removed each clock’s drift, then weighted the residual fluctuations. Thernweight function is set to be proportional to the inverse exponential of the index of each clock’srnfrequency deviation. We find the resultant paper clock to be much more stable and accuraternthan any contributing clock. The paper clock can keep a ± 50 ns phase difference (comparedrnwith UTC) without any calibration, and the Allan deviation of this paper clock is about 1.0×10~(-13)rn(τ = 10 minutes, compared with hydrogen maser). Here, a typical Allan deviation of therncontributing cesium clock is 2.0~3.0×10~(-13) in our measurement system. Finally, we use thisrnpaper clock to synchronize a hydrogen maser via a phase-lock mechanism. A virtual testrnshowed the phase difference between an adjusted hydrogen maser and the paper clock could bernkept within 1 nanosecond without any prediction algorithm.