A new time-delay estimation (TDE) technique based on dynamic programming isdeveloped, to measures the time-varying time-delay between two signals. Dynamicprogramming based TDE technique provides a frequency response 5 to 10 timeshigher than previously known TDE techniques, namely those based on time-lagcross-correlation or wavelet analysis. Effects of frequency spectrum,signal-to-noise ratio and amplitude of time-delay on response (represented astransfer function) of TDE technique is studied using simulated data signals.Transfer function for the technique decreases with increase in noise in signal;however it is independent of signal spectrum shape. Dynamic programming basedTDE technique is applied to the Beam-Emission-Spectroscopy (BES) diagnosticdata to measure poloidal velocity fluctuations, which led to the observation oftheoretically predicted zonal flows in high-temperature tokamak plasmas.
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