Vol.4 No.4 (August 2014)
The Improved Time-Delay Estimation Method Based on the Quadratic Correlation Function
Generalized correlation of TDE and the second correlation of TDE verify that different weight functions will have different effects on accuracy of estimation. After comparing the advantages and disadvantages of different weight function, this paper improves the method of weighting theoretically. This method re-weights the second correlation and improves the accuracy of esti-mation of TDE in the condition of lower SNR accordingly. This paper contrasts the peak of traditional weight in TDE with the improved weight under the same condition of noise. Simulation results show that the improved weights can achieve higher accuracy of estimation under the condition of the low-power signals in the lower SNR compared with other weights.
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