Rate-Integration Gyroscope (RIG) With Gain Self Calibration
Qi Fan, Yi Zhou, Mengxiang Liu, Lin Chen, Yan Su
Abstract
For the purpose of direct angle measurement with high accuracy, this paper focuses on the gain self-calibration of operating modes of MEMS disk gyroscope, when it works in the rate-integration mode. The difference of C/V conversion gain, quality factor and front-end amplifier's gain of gyroscope operating modes will lead to the total gain difference, which causes angle error. Although one-time manual calibration can temporarily reduce the influence of gain difference, environmental factors (e.g. temperature) will interfere with the calibration results. In this paper, a novel self-calibration method is proposed, which detects the gain difference of gyroscope operating modes in real time and compensates it without adding additional circuits. This method is verified using a digital signal processing platform, and the angle dependent bias (ADB) error is reduced from 18 degrees to 2 degrees.