光纤陀螺温变效应误差抑制方法研究

Research on the Suppression Method of Temperature Transience Effect Error of Fiber Optic Gyroscope

在干涉式光纤陀螺组成的捷联惯性导航系统中,光纤陀螺启动过程中温变效应导致的漂移项是导航误差的主要误差源,已成为限制高精度光纤陀螺系统性能进一步提升的关键因素。通过对光纤陀螺启动过程中温变效应的理论分析与建模,提出了一种基于查表补偿的光纤陀螺启动温变效应误差抑制法和误差评价法。实验结果表明,该抑制方法可使-40^+60℃环境下光纤陀螺漂移概率误差从0.02~0.50(°)/h降至0.01(°)/h以下,对应导航系统的导航圆概率误差从1.4~35 n mile/h降至0.8 n mile/h以下,有效抑制了光纤陀螺启动温变效应误差,提升了系统性能。

In the strapdown inertial navigation system composed of interferometric fiber optic gyroscopes,the drift term caused by the temperature transience effect during the startup of fiber optic gyroscope is the main error source of navigation error and has become a limitation to further improve the performance of high-precision fiber optic gyroscope systems.In this paper,through theoretical analysis and modeling of the temperature transience effect during the startup process of the fiber optic gyroscope,a method for suppressing the error of the temperature transience effect of the fiber optic gyroscope based on lookup table is proposed,and the evaluation method of the error of the fiber optic gyroscope temperature transience effect is also proposed.The experimental results show that the suppression method can reduce the drift probability error of the fiber optic gyroscope from 0.02~0.50(°)/h to less than 0.01(°)/h at the environmental temperature of-40^+60℃,corresponding to the navigation circular probability error reducing from 1.4~35 n mile/h to less than 0.8 n mile/h,which effectively suppresses the error of the start-up temperature transience effect of the fiber optic gyro and greatly improves system performance.