Automatic Mode-Matching and Scale Factor Adjustable Detection System for Force to Rebalance Control of Cobweb-Like Gyroscopes

An automatic mode-matching circuit and scale factor adjustable detection system for force to rebalance cobweb-like disk resonator gyroscopes (DRG) are presented in this work. The mode-matching circuit uses a phase detection system to track and control phase difference between output signal of drive mode and quadrature error to match the mode resonance frequencies, which results in a significant performance improvement. Besides, a new scale factor adjustment method is proposed, which could be used in force to rebalance detection system of cobweb-like DRG. The experimental results show that the scale factor of gyroscope with closed loop controlled sense mode improves from 7.9mV/degrees/s to 19.1mV/degrees/s, and the bias instability improves from 11.19 degrees/hr to 0.43 degrees/hr.