Research on the performance of PGC phase demodulation algorithm based on WTD-ESO

Phase generated carrier (PGC) technology is a commonly used signal demodulation scheme. PGC demodulation is easily affected by light source intensity fluctuation, system noise and environmental disturbance. In order to improve the accuracy and robustness of PGC phase demodulation, a PGC phase demodulation algorithm combining wavelet threshold de-noising (WTD) and extended state observer (ESO) is proposed in this paper. WTD is used to preprocess the PGC interference signal with noise to effectively suppress the noise interference. A phase tracker based on ESO is constructed to estimate the phase to be demodulated, the phase change rate and the lumped disturbance in the system as the extended state, so as to achieve the accurate extraction of the phase. This algorithm can significantly improve the accuracy and dynamic response characteristics of PGC phase demodulation in complex noise environment.