Highly Stable Atomic Clock Based on Kalman Filter Optimal State Estimation and Its Realization Method

Abstract

The invention discloses a highly stable atomic clock based on Kalman filter optimal state estimation and its implementation method, including: a Kalman filter module, a controlled oscillator that matches the Kalman filter function, and a multiplier and frequency that match the Kalman filter function Integrated conversion circuit, atomic frequency discriminator, high-speed detector, PID controller matching Kalman filter function; Kalman filter is used to effectively filter the signal, and the filtered signal is fed back to the PID controller to reduce process noise and Measure the influence of noise on system control parameters, so as to realize the optimization of control parameters, make the control system quickly tend to a stable state, thereby greatly improving the frequency stability of the atomic clock system; through the Kalman filter technology, the atomic clock with high temperature control accuracy requirements The temperature is controlled to significantly improve the influence of temperature on the atomic transition frequency, and to suppress the drift of the mid- and long-term frequency stability of the system, thereby greatly improving the mid- and long-term stability of the atomic clock system.

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