Study on square-wave frequency modulation of resonator fiber optic gyroscope

The operation principle and modulation performance of square_wave frequency modulation on resonator fiber optic gyroscope (R_FOG) were analyzed, the limited sensitivity of R_FOG that used square_wave frequency modulation was obtained. It is found that limited sensitivity of R_FOG that uses square_wave frequency modulation is better than that uses sine_wave frequency modulation. Furthermore, the output signal of square_wave frequency modulation is square_wave amplitude modulated signal, and this kind of signal form can be easily processed with digital demodulation method applied in I_FOG. Therefore, square_wave frequency modulation will be more appropriate modulation method for all_digital R_FOG.