Temperature-Dependent Bias Drift Compensation Based on a Dual Hemispherical Resonator Gyroscope System

Hemispherical resonator gyroscopes (HRGs) exhibit exceptional force-to-rebalance (FTR) precision but suffer from temperature-dependent drift, limiting widespread deployment. This study presents a temperature-dependent bias drift compensation method for HRGs using a dual-HRG system configuration. The dual-HRG system compensates for temperature-dependent bias drift based on mode reversal. By implementing alternating mode-reversal control sequences between two HRGs, the dual-HRG system overcomes the limitations of single HRG mode reversal in practical applications. Furthermore, based on the calibration results of phase delay errors, electrode errors and scale factors (SFs) at different temperatures, corresponding temperature compensation modules are incorporated into the dual-HRG system. The residual temperature-dependent bias drift is further compensated by applying the multiple regression algorithm. Experimental results demonstrate that the bias stability of the dual-HRG system after mode reversal is improved by more than 98.7% and 87.7% compared to the two individual HRGs, respectively. Moreover, the temperature-dependent bias drift is further compensated by the multiple regression algorithm, and the bias stability of the dual-HRG system is improved by more than 70.5%.