Short-Time Fourier Transform of Continuous Wave Doppler Signals
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ABSTRACTA Doppler-based ultrasonic monitoring scheme was introduced to detect discontinuities on the surface of a rapidly moving object. Single-tone, continuous wave (CW) ultrasound was impinged onto the moving surface and the reflected signal was processed by a Short-Time Fourier Transform (STFT) algorithm to identify surface anomalies. By monitoring the peak magnitude of the STFT spectra within a specified window, it was possible to reconstruct a signal representing Doppler frequency shift continuously in the time domain.
2019 ◽
Vol 233
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pp. 3671-3683
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Vol 33
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pp. 468-475
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2002 ◽
Vol 51
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pp. 440-444
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