Fig. 1. Schematic diagram of classical PGC-Atan demodulation

Fig. 2. Schematic diagram of PGC-CC-Atan demodulation

Fig. 3. Schematic diagram of PGC-EF-Atan demodulation

Fig. 4. Simulation results of the three algorithms and the variation trend of J₁(C)/J₂(C) when C deviates from 0.1 rad to 6.1 rad

Fig. 5. Simulation results of the three algorithms under the influence of the two nonlinear factors

Fig. 6. Simulation results of PGC-CC-Atan algorithm under the influence of the three nonlinear factors

Fig. 7. Simulation results of PGC-EF-Atan algorithm under the influence of the three nonlinear factors

Fig. 8. EFPI demodulation experiment platform

Fig. 9. Comparison between the demodulation results of the two algorithms under different C and the calibration results of the reference demodulator

Fig. 10. (a) The waveform and (b) spectrum of the original signal

Fig. 11. Demodulation results using PGC-Atan algorithm. (a) Waveform; (b) spectrum

Fig. 12. Demodulation results using PGC-CC-Atan algorithm. (a) Waveform; (b) spectrum

Fig. 13. Demodulation results of PGC-EF-Atan algorithm. (a) Waveform; (b) spectrum; (c) Lissajous figure of P(t) and Q(t)

Fig. 14. Comparison between the demodulation results of PGC-EF-Atan algorithm and the calibration results of the reference demodulator