Design And Simulation Of A Fuzzy PID Controller Based On Interferometric Fiber Optic Gyro

As a new type of inertial device,fiber optic gyroscope(FOG)has been widely used in various fields due to its advantages of no moving parts,high reliability and long life.In China,as result of the limitation of the FOG related optical processing technology and the blockade of FOG related technology from foreign,high-precision FOG remains in the laboratory stage.It is found that the signal processing of high-precision FOG mainly adopts the all-digital closed-loop control scheme,in which the optical(electric)path parameters,signal modulation methods and related control technologies are one of the factors affecting the accuracy of the gyro.In this article,based on the work of our predecessors,digital double closed-loop FOG model based on four-state-bias modulation method is in depth research,and the fuzzy control technology is combined to make an in-depth study on the control system of the FOG.Firstly,through the understanding of the basic principle and structure of FOG,the modulation demodulation principle of digital closed-loop FOG and the compensation method of feedback loop gain error under square wave bias are analyzed in detail,their advantages and disadvantages are further discussed.In order to study the relationship between system parameters and performance parameters of FOG,and realize the optimal design of FOG system,based on MATLAB/Simulink simulation software,the digital double closed-loop control model of FOG was constructed and simulated.Secondly,in order to meet the performance requirements of FOG under certain specific conditions,a fuzzy-PID control structure combining two control techniques was designed by the research of the algorithms of PID control and fuzzy control.Finally,it was applied to the previously established FOG system model for effectiveness verification experiments.Finally,in order to further analyze the performance of the designed fuzzy-PID controller,the FOG system with different controllers is compared and the simulation analysis is completed.The comparative analysis of gyro performance under ideal conditions and non-ideal conditions effectively proves the superiority of fuzzy-PID controller performance,and provides an effective reference direction for improving the precision of FOG.