Self-calibration of hemispherical resonator gyroscopes under drastic changes of ambient temperature based on mode reversal

Abstract

The drift caused by temperature variation is a crucial factor limiting the bias stability of hemispherical resonator gyroscopes. In this paper, mode reversal is applied to calibrate for the temperature drift of the hemispherical resonator gyroscope in the case of drastic change of ambient temperature. The control algorithm is proposed and the self-calibration by mode reversal is theoretically analyzed. The influence of mode reversal period on calibration is investigated experimentally. The experiment is conducted in a temperature chamber with a temperature range from −10 ℃ to 40 ℃. The effect of self-calibration by mode reversal is compared under different reversal periods and different change rates of temperature. Results suggested that the bias stability after calibration can be improved by shortening the mode reversal period. When the temperature changes sharply with a change rate of 10 ℃/min, the bias stability is improved by about 30 times. The research offers a new way for hemispherical resonator gyroscope to maintain excellent performance in the environment of drastic temperature changes.