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Proceedings Paper

Digital processing of Doppler signals by means of fast Fourier transform
Author(s): Jan Karol Jabczynski; Artur Szczesniak
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Paper 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.

Paper Details

Date Published: 13 February 1996
PDF: 7 pages
Proc. SPIE 2729, Optical Velocimetry, (13 February 1996); doi: 10.1117/12.232996
Show Author Affiliations
Jan Karol Jabczynski, Military Univ. of Technology (Poland)
Artur Szczesniak, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 2729:
Optical Velocimetry
Maksymilian Pluta; Jan Karol Jabczynski; Mariusz Szyjer, Editor(s)

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