Frequency tracking based analysis of laser Doppler velocimetry signals for sound field measurements

Use of Frequency Trackers in Laser Doppler Velocimetry for Sound Field Measurement: Comparative Study of Two Estimators

“…Results are presented "rst in a noiseless environment in Section 4.1, and for di!erent values of the SNR (10 log(A/2 )) in Section 4.2. For each case, results are shown as a function of the signal modulation index "</i f ?A de"ned in Section 2.2, as this quantity appeared to be a relevant parameter to account for the &di$culty' of the estimation [11]. Indeed, is a small number when the IF variation is small (< is small), or the IF variation is fast ( f ?A is high).…”

“…Previous studies have shown the abilities and limitations of time}frequency analysis for Doppler signal IF estimation in the context of LDV measurement [6,10]. A model of the signal has been established which makes possible the use of parametric methods to estimate the IF law; in a recent study [11], such a method, the Kalman "ltering, was shown to give promising results. This paper deals with the use of an adaptation of Kalman "ltering to estimate the IF variation in the context of LDV application to acoustics.…”