连续旋转的光纤陀螺全温失准角快速建模与补偿方法

Modeling and compensation method for input axis misalignment angle of FOG with continuous rotation

在全温范围内应用的光纤陀螺,其输入轴失准角随温度的变化是影响光纤陀螺惯性系统性能的重要指标之一。特别是在大角速率或者高精度应用时,失准角的变化误差甚至超过零偏漂移误差和标度因数误差。采用温度补偿技术是一种提升光纤陀螺温度性能的有效方法,其中建立精确的温度模型是关键。提出了一种连续旋转的光纤陀螺全温失准角快速建模补偿方法。基于单轴速率转台的连续旋转,可以有效识别光纤陀螺失准角在全温范围内的变化拐点,提高建模和补偿的精度。试验结果表明,某型光纤陀螺全温输入轴失准角变化约14″,补偿后全温输入轴失准角变化小于1″,精度提高了一个数量级以上。在高精度光纤陀螺惯性系统中,该方法可用于指导光纤陀螺失准角的实时温度补偿技术研究及工程实现。

The input axis misalignment angle along with the change of temperature is one of the major indicators of fiber optic gyro inertial navigation system, especially when applied in full temperature. Its influences are more than those of bias error and scale factor error in large angular rate or high precision applica- tions. Temperature compensation technology is an effective method to improve the temperature characteristic of fiber optic gyro. Establishing a mathematical model for temperature is the key technique. A modeling and compensation method for the input axis misalignment angle in full temperature is presented. Based on a continuous rotation method, it can effectively identify the turning point of misalignment angle in full tempe- rature. And then the precisions of the modeling and compensation will be improved. Experiments show that the input axis misalignment angle can be reduced from 14＂ to below 1＂. This method can be used to guide the real-time temperature compensation research and engineering realization of the input axis misalignment angle.