Non-orthogonal Error Calibration Method of Coriolis Vibratory Gyro Electrodes

Abstract

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.