Dynamic characteristics of R-FOG based on the triangle wave phase modulation technique

A resonator fiber optic gyro (R-FOG) is a high accuracy inertial rotation sensor based on the Sagnac effect. Fiber ring resonator (FRR) is the core-sensing element in the R-FOG. Till now, the dynamic response of the FRR is studied, and it is found that the frequency of the resonance dip is shifted away from the resonance frequency when sweeping the laser frequency, and thus must affect the performance of the R-FOG. Therefore, dynamic characteristics analysis of the R-FOG, which usually works in the dynamic state, is in urgent need. This paper presents the expression for the dynamic demodulation curve of the R-FOG based on the triangle wave phase modulation technique. Through analysis and simulation, it is concluded that the frequency zero-deviation will be induced when the R-FOG is in dynamic state, and the gyro error caused by the frequency zero-deviation will increase as the product of the operating range and the bandwidth of the R-FOG.