弹载光纤陀螺旋转惯组误差自补偿技术

目前弹载惯性测量组合测试标定精度受外界干扰影响较大,特别是光纤陀螺温度稳定性低,易受环境温度影响参数变化,导致误差补偿效果不好。针对该问题,提出设计一种光纤陀螺旋转惯性测量组合。在惯性测量组合外加旋转轴,在导弹飞行过程中使惯性测量组合绕旋转轴连续旋转,将射前补偿不完全误差调制为周期项,从而达到误差自补偿的效果。理论分析和仿真结果表明,通过旋转不仅能自动补偿与转轴垂直方向惯性仪表的常值误差和部分安装误差,而且能补偿加速度计部分一次项误差、二次项误差和部分交叉轴耦合项误差,选择合适的旋转方案还可以完全消除旋转速度与陀螺仪标度因数误差、安转误差的耦合误差。

Error Autocompensation of FOG-based Rotating Inertial Measurement Unit for Ballistic Missile

To solve the problems that the prelaunch calibration accuracy of ballistic missile is seriously influenced by external disturbance, especially the temperature stability of Fiber Optic Gyro (FOG) is so low that the parameters are changed by temperature influence and the error compensation is not satisfying, a rotating inertial measurement unit based on FOG for the missile is proposed. A rotating axis is added to the strapdown Inertial Measurement Unit (IMU), the IMU rotates around the axis, and the residual error after prelaunch compensation is modulated into periodic terms. Then, error autocompensation is realized. Through theoretical analysis and simulation, not only the constant error and part of misalignment errors of inertial instruments orthogonal to rotating axis, but the first-order, second-order and part of cross-coupling error of intersecting axis of Accelerometers can be compensated by rotating, and the coupling error between rotating speed and error of scale factor and misalignment of FOG can be eliminated completely by selecting appropriate rotating scheme.