Research On A Method For Tracking System Resonant Frequency Based On Kalman Filter

With the development of science and technology, especially the development of quantum physics, microscopic world, for example, electromagnetic induction, magneto-optical effect and superconducting effect, was known well by people day after day. At the same time,magnetic detection technology has been developed and widely used in the fields of geological exploration, oil and gas detection, mineral exploration, archaeological investigation,medical equipment, earthquake prediction and precision instruments. Magnetic detection technology has become an increasingly important subject, and become popular in scientific research recently. Atomic magnetometer is an important tool for weak magnetic field measurement technology and has many advantages, for example, higher sensitivity. And as an important development direction of weak magnetic field measurement techniques, it has been developed rapidly.In this paper, we propose a method for tracking system resonant frequency based on Kalman filter, for an all-optical atomic magnetometer based on the principle of optical magnetic resonance, and implements on-line parameter identification.Firstly, this paper studies several identification methods, include Kalman filter, and then discusses the working principle of the all-optical atomic magnetometer, involving Zeeman effect, light pumping effects and optical magnetic resonance phenomenon, and lays the foundation for proposing the new signal detection method.Secondly, a new signal detection method was proposed, that is, a method for tracking system resonant frequency based on Kalman filter. And the algorithm was deduced and the algorithm flow was given.Finally, the algorithm for tracking resonant frequency proposed in this paper was simulated on Matlab and the reasonableness of this algorithm was verified.