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Dynamic programming based time-delay estimation technique for analysis of time-varying time-delay
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View: Figures


Image of FIG. 1.
FIG. 1.

Illustration of local matching residual matrix with a probable minimum path.

Image of FIG. 2.
FIG. 2.

Flow diagram for creating two pairs of simulated data signals, with same delay but statistically different noises.

Image of FIG. 3.
FIG. 3.

(a) Power spectrum of a typical turbulence signal from BES diagnostic (dotted line) along with the fitted Gaussian function used as the noise-free carrier signal for dynamic programming based TDE technique. Also shown is the spectrum of input delay signal used in the calculations. (b) Comparison of different TDE techniques.

Image of FIG. 4.
FIG. 4.

(a) Change in transfer function with the change in imposed time-delay amplitude. (b) Improvement in transfer function with increase in for high values of delay amplitude. (c) Improvement in transfer function with interpolation for small values of time-delay.

Image of FIG. 5.
FIG. 5.

(a) Power spectra of carrier signals used for comparing the effects of carrier spectra shape. (b) Transfer functions for the carriers shown in (a) along with one having a shorter bandwidth of .

Image of FIG. 6.
FIG. 6.

Correlated and uncorrelated components of the signal along with SNR plot, showing that the SNR closely follows the correlated signal.

Image of FIG. 7.
FIG. 7.

(a) SNR plots for various noise factor multipliers of white noise added to the Gaussian carrier signal. (b) Transfer functions of dynamic programming TDE technique for SNR plots shown in (a).

Image of FIG. 8.
FIG. 8.

(a) Cross-coherency of poloidal velocity fluctuation at gradually increasing poloidal distances, showing GAM as a coherent fluctuation around 15 kHz. (b) Phase shifts in GAM in poloidal and radial directions. (c) Change in GAM frequency with the change in plasma temperature in a single plasma shot.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic programming based time-delay estimation technique for analysis of time-varying time-delay