Digital processing of Doppler signals by means of fast Fourier transform

Jan Karol Jabczynski; Artur Szczesniak

doi:10.1117/12.232996

13 February 1996 Digital processing of Doppler signals by means of fast Fourier transform

Jan Karol Jabczynski, Artur Szczesniak

Proceedings Volume 2729, Optical Velocimetry; (1996) https://doi.org/10.1117/12.232996
Event: Optical Velocimetry, 1995, Warsaw, Poland

Abstract

In the present paper we discuss the implementation of two methods of signal validation for analysis: the amplitude trigger and the spectral trigger. In the first method after validation of the signal with the amplitude trigger the temporary spectrum with the Gaussian window centered on the peak amplitude point is computed with the use of the fast Fourier transform (FFT). The spectrum averaging procedure is applied to improve the signal-to-noise ratio (SNR) value. In the second method the validation trigger is based on analysis of the SNR level obtained from the spectrum computed from a short record (64 or 128 points). In this case the SNR value is defined as the ratio of the peak of the power spectrum of the signal to mean noise power. After validation the spectrum of a 1024-sample record is computed with the use of the FFT and the averaging procedure is performed in the next step. Both methods were verified on simulated data as well as real DS samples taken from experiment.

Citation Download Citation

Jan Karol Jabczynski and Artur Szczesniak "Digital processing of Doppler signals by means of fast Fourier transform", Proc. SPIE 2729, Optical Velocimetry, (13 February 1996); https://doi.org/10.1117/12.232996

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