激光陀螺零偏误差复合信号补偿分析

Study on the bias error compensation of ring laser gyroscope based on compound signals

作为一种集成了光学、电学和机械力学的复杂系统,激光陀螺可以精确地测量物体的角速率输出。为了满足惯性导航系统长时、高精度的测量要求,研究了激光陀螺内部不同类型的传感器与激光陀螺零偏误差之间的特性;在传统的基于温度的零偏误差补偿方法的基础上,引入二频机抖激光陀螺内部温度传感器、光电二极管和粘在抖动机构上的压电陶瓷的输出信息进行复合建模;利用非线性拟合能力强的支持向量机算法,针对不同类型信息与二频机抖激光陀螺零偏误差的相关性对模型进行优化。实验结果表明,该二频机抖激光陀螺零偏误差补偿模型的补偿精度高于传统的补偿方法。

As a complex system combined with optics,electronics and mechanics,the RLG（ ring laser gyroscope） can measure the angle rate with high accuracy. In order to meet the requirement of longer-time and higher precision in inertial navigation system,the characteristics between the RLG drift error and different signals from various sensors were studied. Based on the traditional RLG drift error compensation model,the compound signals from thermometers,photodiodes and piezoelectric ceramics attached on the dithered mechanism were introduced into the model.Moreover,by utilizing the support vector machine algorithm which has good nonlinear fitting capacity,the model was optimized by the correlation features between the mechanically dithered RLG drift error and the compound signals. The experimental results show that the precision of the mechanically dithered RLG drift error compensation model is higher than the traditional one.