A Reference Time Scale Generation Method Based on Threshold Autoregressive Model

Abstract

The present invention provides a reference time scale generation method based on a threshold autoregressive model. The method comprises: firstly, calculating an atomic clock phase difference; next, predicting a current rate of each atomic clock by TAR modeling, calculating a difference of an atomic clock rate and the predicted rate, and calculating the atomic clock rate again after updating a weight; and finally, when the atomic clock rates obtained by calculation for two successive times are equal to each other, calibrating a master clock by using the phase difference. According to the method provided by the present invention, the rate of the atomic clock relative to the rate of the reference time scale can be accurately predicted by using the threshold autoregressive model. And the scale of each atomic clock is determined according to a prediction error of the rate, and for the atomic clock with unstable performance, the rate can be well predicted and can be deducted during calculation, and limited atomic resources are fully used, so that TA accuracy and stability in a small time-keeping laboratory are improved.

Description

technical field [0001] The invention relates to a method for generating reference atomic time in a timekeeping system, belonging to the technical field of time and frequency. Background technique [0002] The timekeeping system is established and maintained by a clock group with a certain scale. The purpose of using the time scale algorithm is to use statistical methods to integrate the atomic clocks in the clock group into a more stable, more accurate, A more reliable synthetic atomic time scale as a reference time scale for master clock frequency control. In the time-scale algorithm, the two most critical factors are the determination of the weight and the frequency prediction model. At present, the most commonly used time scale algorithm in most punctuality laboratories is the classic Algos algorithm. For example, the International Bureau of Power (BIPM) uses this method to obtain UTC, and the methods adopted by NICT and the National Time Service Center of Japan are simi...

AI Technical Summary

Problems solved by technology

However, in today’s world where the demand for punctuality is increasing, many new small-scale laboratory atomic clocks are small in number and have performance deviations. The use of primary or quadratic models can no longer meet the prediction requirements of atomic clock rates for these performance deviations, and reduce the weight or even The method of taking the weight of 0 cannot make full use of the limited atomic clock resources. Therefore, a new time scale algorithm that is more suitable for small punctual laboratories is needed

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