Atomic clock automatic calibration method and system based on Beidou and ground reference transmission

Abstract

The invention relates to an atomic clock automatic calibration method and system based on Beidou and ground reference transmission, computer equipment and a storage medium. The method comprises the following steps: measuring the frequency stability and the initial frequency accuracy of a rubidium atomic clock to be detected through a ground base station and frequency measurement equipment; measuring a time difference signal of the rubidium atomic clock to be detected through a time difference measuring circuit and a Beidou receiver; constructing a measurement matrix of a Kalman filtering algorithm according to the frequency stability and the time difference signal; constructing a state equation of a Kalman filtering algorithm of the four parameters; the four parameters comprise phase, frequency, frequency drift and frequency stability; and inputting the frequency stability, the initial frequency accuracy and the time difference signal into a processor for Kalman filtering algorithm iteration, and outputting frequency control information to calibrate the rubidium atomic clock to be detected. By adopting the method, the rubidium atomic clock can be automatically calibrated.

Description

Technical field [0001] This application relates to the field of data processing technology, and in particular to an automatic calibration method and system for atomic clocks based on Beidou and ground reference transmission. Background technique [0002] With the widespread application of Beidou timing, taking advantage of the long-term stability and high accuracy of Beidou timing signals, by measuring the time deviation between the rubidium atomic clock and the satellite timing signal, the Kalman filter is used to calculate the frequency deviation and frequency drift of the rubidium atomic clock. rate parameters, and then automatically calibrate the frequency accuracy of the rubidium atomic clock to obtain a high-accuracy frequency signal. The existing Beidou satellite calibration rubidium atomic clock technology mainly uses the method of estimating the initial frequency accuracy, and calibrate the rubidium atomic clock through the Kalman filter algorithm of the three state...

AI Technical Summary

Problems solved by technology

[0003] However, the built-in rubidium atomic clock in the high-precision time service / timekeeping system, because the output frequency of the rubidium atomic clock frequency source has the characteristics of aging drift, that is, the accuracy of the output frequency becomes worse with time, so the rubidium atomic clock needs to be sent to the Metrology Institute regularly. Use a primary frequency standard to measure frequency accuracy and manually calibrate it. The calibration process and equipment are complicated and time-consuming, and affect the overall use of high-precision timing / timing systems

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