全反射棱镜式激光陀螺温度误差标定及参数辨识方法研究
Study on Temperature Error Calibration and Parameter Identification Method of Full Reflection Prism Laser Gyro

全反射棱镜式激光陀螺的光路与传统镀膜反射式激光陀螺的光路不同，有较长的光路在棱镜中通过，温度的变化是影响其输出精度的一个重要因素。研究了变化的物理场下，温度、温度变化率和温度梯度对激光陀螺的影响机理，推导了温度变化条件下激光陀螺的零偏二阶模型，刻度系数的三阶模型，设计了激光陀螺的温度误差标定方案，并进行了试验。采用逐步回归分析法和BP神经网络两种方法对温度误差模型参数进行了辨识，通过温度误差补偿结果证明了两种方法的有效性。
The optical path of the prism ring laser gyro is different from that of the conventional reflective laser gyro in that quite long optical path is through the prism. The change of temperature is an important factor affecting the output precision. In this paper, the influence mechanism of temperature, temperature changing rate and temperature gradient on the laser gyros is studied. The two-order model of zero bias and the three-order model of the calibration factor of laser gyro under temperature variation are deduced. The calibration scheme of temperature error is designed, and the calibration experiment is carried out. Two methods of stepwise regression analysis and BP neural networks are used to identify the parameters of the temperature error model, and the effectiveness of the two methods is proved by the temperature error compensation