Fig. 1. RFOG system based on sinusoidal phase modulation and synchronous demodulation

Fig. 2. Simulation results of resonance curve and demodulation curve. (a) Resonant curve; (b) demodulation curve

Fig. 3. Schematic diagram of Allan variance curve^[12]

Fig. 4. Frequency spectrum distribution of laser energy after phase modulation

Fig. 5. Influences of modulation coefficient and demodulation phase on demodulation slope. (a) M₁=1.080; (b) M₁=2.405

Fig. 6. Relationship between demodulation slope and modulation parameters

Fig. 7. Relationship between normalized output power of resonance cavity and modulation parameters

Fig. 8. ARW caused by shot noise at different modulation parameters

Fig. 9. Relationship among theoretical ARW,slope of demodulation curve,and modulation frequency (M₁=1.080)

Fig. 10. Gyro output results and PSD of frequency noise at different modulation frequencies. (a) Modulation frequency of 1 MHz; (b) modulation frequency of 600 kHz; (c) modulation frequency of 240 kHz