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为了提高陀螺加速度计的标定精度,有必要对交叉二次项进行精确的标定。提出了一种陀螺加速度计交叉二次项在精密线振动台上的测试方法,通过分析陀螺加速度计的测试原理建立了包含交叉二次项的误差模型。利用分度头将陀螺加速度计翻滚到不同的位置,测量陀螺加速度计进动整周期的相关时间参数和输出数据。通过计算加速度计模型输出与平均角速率积分之间的关系,准确辨识出陀螺加速度计误差模型中的各误差项系数。该方法可以有效抑制陀螺加速度计的输出误差,提高标定的精度。最后通过仿真分析,验证了该方法可以准确辨识出陀螺加速度计的二次项、交叉二次项等高阶误差项系数,辨识精度达到了10~(-7),进一步提高了陀螺加速度计在线振动台上的标定精度。
In order to improve the calibration accuracy of the gyro accelerometer, it is necessary to accurately calibrate the cross quadratic term. A test method of the cross quadratic term of gyro accelerometer on the precision linear vibration stage is proposed. The error model including the cross quadratic term is established by analyzing the test principle of the gyro accelerometer. The use of indexing head gyro accelerometer tumbling to different locations, gyro accelerometer measurement into the whole cycle of the relevant time parameters and output data. By calculating the relationship between the output of the accelerometer model and the average angular velocity integral, the error coefficients of the gyro accelerometer error model can be accurately identified. The method can effectively restrain the gyro accelerometer output error and improve the calibration accuracy. Finally, the simulation analysis shows that this method can accurately identify the quadratic term, cross quadratic term and other high-order error term coefficients of gyro accelerometer, and the recognition accuracy reaches 10 ~ (-7), which further improves the performance of gyro accelerometer online Vibration table calibration accuracy.