科氏振动陀螺电极的非正交误差标定方法

Ming X. Tang, Haifeng Zhang, Gang Chen, Chenkai Jia, Song Yang
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引用次数: 0

摘要

科里奥利振动陀螺仪通过一对正交的检测电极来检测驻波模态角,检测电极的非正交性会导致陀螺仪检测到的驻波振动角产生误差,影响陀螺的精度。针对科里奥利振动陀螺仪检测电极的非正交性问题,提出了一种陀螺仪检测电极的非正交误差标定方法。从科里奥利振动陀螺的角度测量原理出发,推导了检测电极存在非正交误差时的角度检测误差模型,提出了一种考虑陀螺漂移影响的陀螺检测电极非正交误差的离散标定方法。实验结果表明,检测电极非正交误差的标定精度优于3”,完全满足陀螺仪的性能指标。
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Non-orthogonal Error Calibration Method of Coriolis Vibratory Gyro Electrodes
The Coriolis vibratory gyro detects the standing wave mode angle through a pair of orthogonal detection electrodes, and the non-orthogonality of the detection electrode may cause an error in the standing wave vibration angle detected by the gyro, affecting the accuracy of the gyro. Aiming at the problem of non-orthogonality in the detection electrodes of the Coriolis vibratory gyro, a non-orthogonal error calibration method for the gyro detection electrode is proposed in this paper. Starting from the angle measurement principle of the Coriolis vibratory gyro, the angle detection error model in the presence of non-orthogonal error of the detection electrode is derived, and a discrete calibration method for the non-orthogonal error of the gyro detection electrode is proposed, which considers the influence of gyro drift. The experimental results show that the calibration accuracy of the non-orthogonal error of the detection electrode is superior than 3”, which fully meets the performance index of the gyro.
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