Research On Technologies Of Temperature Modeling And Compensation Of Mechanically Dithered Ring Laser Gyroscope

According to the use of strapdown inertial system with mechanically dithered ring laser gyroscope under complex environment, the temperature modeling and compensation technologies are researched in this dissertation.A model of ring laser gyroscope based on thermal theory is established. The temperature-delay effect is analyzed theoretically. Also, the expressions of static temperature model and stepwise regression model are achieved mathematically, and the shortcomings of traditional temperature model are explained. What's more, a more physically realistic model called time series model is achieved.Through correlation analysis, the correlation between bias of ring laser gyroscope and past temperature series is obtained. After accomplishing the model identification experiment as well as theory, the time series model of ring laser gyroscope from both device-level and system-level is achieved.For the system-level temperature modeling, the mechanism of shock absorber's deformation on output of gyroscope is analyzed. According to these analyses, the influence of shock absorber's deformation can be reduced by adjusting gyro's sensitive axis during temperature experiment. The influence on compensation accuracy is also analyzed. According to the results of simulation, the deformation performance of shock absorbers can be selected.At last, the environmental adaptability between traditional temperature models and time series model is compared, including the robustness, the adaptability of wide temperature range and the adaptability of wide temperature changing rate range. The results show the time series model has a better environmental adaptability. It's a temperature model of gyros under complex environment.