The Research And Application Of Temperature Error Compensation And Optimization Algorithm For Fiber Optic Gyro Monitoring System

With the development of water conservancy project in China,the dam reservoir has been built all over the country.Since the quality of the dam is closely related to the people’s property and life safety in the lower reaches of the reservoir,the dam safety monitoring is particularly important.The two important safety monitoring project of CFRD is panel deflection and dam settlement.Traditional monitoring equipment has been showing its shortcomings,fiber optic gyro system as a new type of monitoring equipment,has been successfully used in the Shuibuya and Sianjiang CFRD.compared with the traditional monitoring equipment,its advantage is obvious.such as: monitoring distributed monitoring,strong anti-jamming capability,long life,easy maintenance,etc.However,The fiber optic gyro will drift with the change of ambient temperature.Which will cause errors in the monitoring of the project.Therefore,how to eliminate the drift error of the fiber gyro monitoring system and improve the precision of the monitoring system is still to be solved.In this paper,a series of research and analysis are carried out on the application of the temperature error and optimization algorithm of the fiber optic gyro monitoring system in the world’s second highest panel rockfill dam project.First,analyze the main error sources that affect the accuracy of the fog gyroscope,and determine that the temperature is the largest error item that affects the accuracy of the fiber optic gyroscope.Focusing on two aspects of theory and experiment,we know the temperature properties of each of the main optical devices,and it sums up the drift patterns of the thermal effects of the fiber optic gyroscopes.Second,according to the laws of the fiber optic gyro temperature drift and return theory of least squares polynomial fitting model,established the model of the temperature drift error compensation.Experiments show that the model significantly reduced the temperature drift error,can effectively improve the accuracy of fiber optic gyro.it is simple and practical,which has a certain engineering practicability.Third,In terms of fiber optic gyro system hardware: In this paper,considering the feasibility of optical fiber gyro monitor system in underwater operation,designed a waterproof device system.Fourth,in terms of Fiber optic gyro system algorithm: It is propose a new algorithm to eliminate that accumulated drift error of fib optic gyro by means of static output signal value of accelerometer.The experimental results show that the trajectory curve drawn by the new algorithm can reflect the real situation of the monitored object.The calculation method of the new algorithm is not only simple,but also can effectively improve the precision of the fiber optic gyroscope.Fifth,Applying the fiber optic gyro system to the monitoring panel and The dam settlement of the Monkey rock CFRD.Analyzing the results of the second stage of it and summarized.0 + 162.8 cross-section monitoring results show that the deflection deformation of the maximum area is not abnormal,which is consistent with the basic deformation pattern,The Houziyan rock dam in the storage period is safe to run.