Title :
A new time delay estimation in subbands for resolving multiple specular reflections
Author :
Azimi-Sadjadi, Mahmood R. ; Charleston, S. ; Wilbur, J. ; Dobeck, G.
Author_Institution :
Dept. of Electr. Eng., Colorado State Univ., Fort Collins, CO
fDate :
12/1/1998 12:00:00 AM
Abstract :
A new time delay estimation procedure is proposed using the multiresolution analysis framework through a discrete wavelet transform (DWT). Once the signals are decomposed, the time delays are estimated iteratively in each subband using two different adaptation mechanisms that minimize the mean squared error (MSE) between the reference and primary signals in the corresponding subband and level. The localization of the minima of the MSE curves at different levels and subbands is used in order to arrive at the time delay estimates. The proposed scheme is then applied to a real-life problem of underwater target detection from acoustic backscattered data
Keywords :
acoustic wave reflection; adaptive filters; adaptive signal detection; backscatter; delay estimation; discrete wavelet transforms; filtering theory; mean square error methods; signal resolution; sonar detection; underwater sound; DWT; MSE curves; SNR; acoustic backscattered data; decimation; discrete wavelet transform; filter bank; iterative estimation; mean squared error; multiple specular reflections; multiresolution analysis; primary signal; reference signal; signal decomposition; signal decorrelation; sonar; subband adaptive filtering; time delay estimation; underwater target detection; Amplitude estimation; Cities and towns; Clutter; Delay effects; Delay estimation; Discrete wavelet transforms; Matched filters; Object detection; Optical reflection; Signal processing;
Journal_Title :
Signal Processing, IEEE Transactions on
