Temperature Error Compensation Of Inertial Devices In SINS

With the development of aerospace, aviation and other fields, the precision level of inertial devices in inertial navigation system have become increasingly demanding. When the temperature changes, the output of the device has a certain inertia drift. Therefore it requires certain methods to compensate for this drift.In this thesis, we analyzed the works of quartz flexible accelerometer and fiber optic gyroscope. Summarized the various error of quartz flexible accelerometer and fiber optic gyro in the work process. And analyzed the mechanism of temperature impact on their output. And temperature error models of them were established.Temperature error model of quartz flexible accelerometer includes bias temperature error and scale factor temperature error. According to the mechanism both of them are High-order polynomial model. The thesis used linear regression analysis to determine the order of the model. On this basis, the thesis designed experiments to establish the temperature error model, and verified the validity and reproducibility of the model.Ambient temperature changes produce a temperature gradient in fiber ring. Temperature gradient causes non-reciprocity errors in the output of gyro. This is the Shupe effect, the main cause of temperature error of fiber optic gyro. We quantitative analysed on the error of Shupe effect, and found that there is a linear relationship between Shupe effect and temperature change rate of environment. On this basis, the thesis designed experiments to establish the temperature error model, and verified the validity and reproducibility of the model.Finally, the thesis gave a solution modeling and real-time compensation for the temperature error of quartz flexible accelerometers and fiber optic gyros in engineering. For accelerometer, the temperature error model of zero bias and scale factor need to be considered separately and to use different devices to test. Hence need to follow the steps given on modeling. Since the rate of temperature change involved in the model, the thesis gave a method of calculating and updating the real-time rate of temperature change when real-time compensating of fiber optic gyros. It turns out that the modeling and compensation schemes proposed in the thesis can play good compensation effect on the output of the quartz flexible accelerometer and the fiber optic gyro in an inertial navigation system and it has high engineering significance and practical value.