旋转弹用三轴加速度计安装位置误差标定补偿技术

Calibration and Compensation Method on Installation Position Error of Tri-Axis Accelerometer Units Used in Spinning Projectiles

针对旋转弹用捷联惯性导航系统中三轴加速度计在高转速下,由于安装位置误差使得3个加速度计对比力的测量对应于不同的点位置。在角运动环境下姿态解算时产生动态误差的问题,提出了一种标定补偿三轴加速度计安装位置误差的方法。分析了动态误差产生的原因,在常规静态标定的基础上推导了动态标定的模型,高转速下的转台试验表明本方法能够很好的补偿三轴加速度计在高转速下产生的误差,有效地提高惯性测量单元姿态测量的精度,具有很好的工程应用性。

Viewed at the problem that the measurement points and the installation position of accelerometers don’t coincide,having dynamic error at high speed,developed a dynamic error calibration method. The basic principle of the new calibration method was expounded,and the solving process of the new method was deduced,and the means of identifying and separating parameters were put forward. A general model of dynamic error calibration for accelerometer unit installation position calibration is established. This paper designed the three-axis turntable static test scheme and ground semi-physical simulation test. All the experiment results show that the present method can effectively improved the measurement accuracy of accelerometer unit and can provide accurate specific force input for the subsequent navigation measurement in engineering application.