Phase demodulation method and device based on digital carrier and storage medium

Abstract

The application discloses a kind of based on digital carrier's phase demodulation method, device and storage medium, phase demodulation method includes: the direct current signal of the beat frequency signal obtained is filtered out, and the alternating current part containing phase information in beat frequency signal is obtained;Beat frequency signal is obtained using Hilbert to the alternating current part and quadrature signal;Remove the fundamental frequency in the obtained quadrature signal and carry out carrier modulation, obtain phase carrier modulation signal;The obtained phase carrier modulation signal is mixed with the fundamental frequency signal of carrier and is filtered by low-pass filter to obtain first filter signal, the obtained phase carrier modulation signal is mixed with frequency multiplication signal and is filtered by low-pass filter to obtain second filter signal;The first filter signal and second filter signal obtained are respectively differentiated and then cross multiply to extract phase.The application realizes the stable invariability of carrier depth by digital carrier process, improves the signal-to-noise ratio of demodulation signal, and improves demodulation precision.

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