一种基于双轴位置转台的现场标定方法

针对激光陀螺捷联惯性测量单元(LSIMU)的系数会随时间变化的问题,基于双轴位置转台提出一种激光陀螺的现场标定新方法。该方法在3个位置对激光陀螺进行标定,根据其标定模型建立9个方程,通过正反旋转消除地球自转角速度在非转动轴上的影响,以及常值漂移在各个输出轴上的影响,最后求解出激光陀螺的标度因数和安装误差。实验结果表明,该方法可在缺乏高精度速率转台的条件下完成激光陀螺的标定,其精度与传统实验方法精度相当,缩短了标定时间。

A Novel Field Calibration Method Based on Two axis Position Turntable

In view of the problem that the coefficient of laser gyro strapdown inertial measurement unit (LSIMU) will change with the time, a novel field calibration method of laser gyro is presented based on the two axis position turntable. The method gathers the output signals of LSIMU at three different positions, then nine equation formula are established based on the calibration model. The effect of the rotational angular velocity of the earth on the non rotation axis is eliminated through the positive and negative rotations, and the effect of constant drift on the each output axis is also eliminated. The scale factor and the installation error of laser gyro are finally solved. The experiment results show that the proposed three position calibration method can calibrate laser gyroscope without high precision turntable and is almost on the same accurate level precision with the traditional method, and can obviously reduce the calibration time.