Error Mechanism Analysis And Data Processing For Atomic Spin Gyroscope Based On SERF

With the development of quantum control technology,in recent years,the emerging atomic spin gyroscope has become a new type of gyroscope after mechanical gyroscope,optical gyroscope and micro-electromechanical gyroscope.In the absence of Spin-Exchange Relaxation-Free(SERF),the relaxation time of atomic spin gyroscope becomes longer,the coherence becomes better,and the atomic density is improved,which can effectively improve the signal to noise ratio and provides favorable conditions for the development of atomic spin gyroscope into the next generation of high-precision gyroscope.In order to improve the accuracy of atomic spin gyroscope,it is necessary to analyze the error mechanism of atomic spin gyroscope and establish a reliable error model for the random error of atomic spin gyroscope and compensate for gyro output Therefore,this paper has carried on the thorough research to the error mechanism and the random drift of the atomic spin gyroscope.The main research contents and work are as follows:The working principle of SERFatom spin gyroscope is introduced,the dynamic model of SERFatom spin gyroscope is established,and its dynamic characteristics are analyzed.The control system model and error model of SERFatom spin gyroscope are established.The noise of SERFatom spin gyroscope is mainly derived from the temperature disturbance of atomic spin SERFstate,the nuclear spin magnetic field disturbance,the optical system displacement,and the effects of the errors on the accuracy of atomic spin gyroscope are analyzed.The research of atomic spin precession detection method is carried out,a closed-loop electro-optical modulation detection method with high sensitivity,scale factor stability and simple system is proposed,and the method is verified experimentally.The key device-lock-in amplifier was designed and simulated.Finally,the random drift characteristics of atomic spin gyroscope are analyzed.Based on that,the stochastic drift model of atom spin gyroscope is established by using time series analysis theory.The appropriate filter is used to filter out the noise in the random drift signal,which improved the measurement accuracy of atomic spin gyroscope.