Closed-loop control method for nuclear-spin self-compensation point of SERF atomic-spin top

Abstract

The invention discloses a closed-loop control method for a nuclear-spin self-compensation point of an SERF atomic-spin top. According to the method, an amplitude-frequency characteristic curve and a phase-frequency characteristic which respond to an alternating current magnetic field of a gyroscope are firstly measured, the resonant frequency and the resonant frequency phase position correspondingto an alkali metal electron resonance peak are found out, a longitudinal compensation offset magnetic field is dynamically adjusted in a frequency closed-loop manner or a phase position closed-loop manner, and the alkali metal electron resonance peak is controlled to be unchanged in real time, so that the longitudinal magnetic field sensed by alkali metal electrons is constant, and the closed-loop control of the nuclear-spin self-compensation point is realized. According to the method, the influence caused by the fluctuation of a longitudinal environmental magnetic field and an inert gas nucleon longitudinal magnetic field to the alkali metal electrons can be reduced, signal fluctuation and coupling errors during the measurement of double-shaft angular rate of the SERF atomic-spin top arerestrained, and the linearity degrees of precision and calibration factors of the gyroscope are increased.

Description

technical field [0001] The invention relates to a SERF atomic spin gyroscope core spin self-compensation point closed-loop control method, which belongs to the field of SERF atomic spin gyroscope precision closed-loop control and can be used to improve the accuracy and scale coefficient linearity of the SERF atomic spin gyroscope. Background technique [0002] The gyroscope is the core sensor of the inertial navigation system and determines the overall performance of the inertial navigation system. With the rapid development of quantum control technology, the atomic gyroscope has become an important development direction of the new generation of gyroscopes. Among them, the spin-exchange relaxation-free (Spin-exchange relaxation-free, SERF) atomic spin gyroscope has the advantages of ultra-high limit accuracy and easy integration, and has become a research hotspot of atomic gyroscopes. SERF atomic spin gyroscopes usually apply a bias compensation magnetic field in the direct...

AI Technical Summary

Problems solved by technology

However, at present, the nuclear spin self-compensation point works in an open-loop state, and the magnetic field felt by the alkali metal is easily affected by the longitudinal external environmental magnetic field and the fluctuation of the longitudinal magnetic field of the inert gas nuclei, thereby introducing gyro drift; in addition, the SERF atomic spin gyroscope is a A dual-axis gyroscope, the fluctuation of the nuclear spin self-compensation point will also cause the fluctuation of the coupling coefficient of the dual-axis angular rate measurement, introduce coupling errors, and reduce the linearity of the scale coefficient

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