用杆臂效应在轨标定加速度计标度因数的方法

摘要

Aimed at the low precision and high cost of on-orbit calibrating accelerometer scale factor,as well as the auxiliary requirement and the difficulty in engineering implementation,a method of on-orbit calibrating accelerometer scale factor based on the lever arm effect was presented.As long as the knob mechanism of the inertial assembly rotates uniformly at the given speed,the scale factor of the accelerometer can be calculated according to the output of the gyroscope and the accelerometer in the inertial assembly.The calibration principle was analyzed,the calibration model was built and the separation algorithm of the error coefficient was derived.The effect of this method was verified by the ground test.%针对加速度计标度因数在轨标定精度低、成本高,需要其他辅助设备且难以工程实现等问题,提出了一种利用杆臂效应在轨标定加速度计标度因数的方法.用该方法对加速度计进行在轨标定,只需要惯组旋转机构按照给定的速率匀速旋转,根据惯组内陀螺仪及加速度计的输出即可解算出加速度计的标度因数.分析了标定原理,建立了标定模型,推导了误差系数的分离算法.通过地面试验验证了方法的有效性.