2023
DOI: 10.1515/phys-2023-0172
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Weak beat frequency extraction method for photon Doppler signal with low signal-to-noise ratio

Ya-Nan Sun,
Shen-Jiang Wu,
Guo-Sheng Qin
et al.

Abstract: In the window function spectrum of the low signal-to-noise ratio photon Doppler signal after the short-time Fourier transform, the weak beat frequency cannot be obtained by extracting the maximum amplitude spectrum frequency of each window because the amplitude of the noise spectrum exceeds the weak beat frequency. In this article, the value of the beat frequency is first estimated by the Kalman filter. Then, a multiple analytical bandpass filter is constructed to refine the spectrum of the high noise signal w… Show more

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