一种应用于光纤陀螺寻北的温度漂移补偿方法

A temperature drift compensation method applied to fiber optic gyroscope north-seeking

光纤陀螺寻北启动误差是启动过程温度剧烈变化导致的光纤陀螺零偏漂移产生的误差,表现为冷启动时寻北误差较稳定段时明显增大,事实上延长了有效寻北时间。通过对光纤陀螺温度漂移影响因素的分析,利用经验模态分解、ARMA建模与Kalman滤波建立多参量线性模型,实现了一种应用于光纤陀螺寻北的温度漂移补偿方法,实验结果表明,该方法可以将寻北启动误差降低近80%,使得冷启动时寻北精度与稳定段相当并缩短了有效寻北时间。

The startup error of fiber optic gyroscope(FOG)in north-seeking is the error caused by the zero-bias drift of FOG caused by drastic change of the temperature in the starting process.The start-up error significantly increases north-seeking error during the cold startup phase compared to the stable phase,which prolongs the effective north-seeking time.Through the analysis of the factors affecting the temperature drift of FOG,the multi-parameter linear model was established by empirical mode decomposition(EMD),autoregressive-moving average(ARMA)modeling and Kalman filtering to realize a temperature drift compensation method applied to FOG north-seeking.The experimental results show that the method can reduce the north-seeking startup error by nearly 80%,so that the startup north-seeking precision is equivalent to the stable phase and the effective north-seeking time is shortened.