High-stability atomic clock based on Kalman filtering optimal state estimation and implementation method

Abstract

The invention discloses a high-stability atomic clock based on Kalman filtering optimal state estimation and an implementation method. Thehigh-stability atomic clock comprises a Kalman filtering module, a controlled oscillator matched with a Kalman filtering function, a frequency multiplication and frequency comprehensive conversion circuit matched with the Kalman filtering function, an atom frequency discriminator, a high-speed detector and a PID controller matched with the Kalman filtering function. A Kalman filter is used for effectively filtering a signal, the filtered signal is fed back to a PID controller, and the influence of process noise and measurement noise on system control parameters is reduced, so that the optimization of the control parameters is realized, the control system quickly tends to a stable state, and the frequency stability of an atomic clock system is greatly improved; through the Kalman filtering technology, the temperature of the atomic clock with a high temperature control precision requirement is controlled, the influence of the temperature on the atomic transition frequency is obviously improved, and the drifting of the medium and long term frequency stability of the system is inhibited, so that the medium and long term stability of the atomic clock system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of microwave and optical frequency atomic clocks and quantum frequency standards, in particular to a high-stability atomic clock based on Kalman filter optimal state estimation and its realization method. Background technique [0002] Atomic clocks are scientific devices capable of outputting the most accurate and stable frequency signals so far. At present, atomic clocks with the best performance have been able to achieve 10 -19 Frequency change measurements of magnitude. Thanks to the development of atomic clocks, atomic clocks can be seen in many time-frequency related fields, such as global satellite navigation and positioning systems, high-speed information network time-frequency synchronization, etc., and high-performance atomic clocks are gradually being applied to These applications undoubtedly highlight the huge application prospects and potential of high-performance atomic clocks. [0003] Atomic...

AI Technical Summary

Problems solved by technology

The realization of the present invention can well solve the problem of residual control deviation in the existing temperature control and frequency control technology of atomic clocks and the inability to avoid the influence of external factors such as process noise and measurement noise, resulting in poor control effect and limiting the further improvement of the atomic clock frequency stability index question

Images