Feedback Network Applied in Frequency Locking of Resonator Gyro

Abstract

Frequency locking of resonator gyro (R-FOG) is a key technology in gyro signal detection, the frequency locking stability determines the performance of the gyro. Based on transmission theory of ring resonator, this paper analyzes the resonant characteristics, builds the R-FOG system, realizes the output of resonance spectral line first harmonic by using sine wave phase modulation and demodulation technology. According to the source of circuit drift error in the traditional analogue proportion integral (PI), the T-type feedback network which can effectively inhibit the drift error was proposed and applied to the frequency locking of resonator gyro, which obtained better effect. By Allan variance analysis, the locking stability of resonant frequency for 4000s is better than 9×10-12.