Journal
SIGNAL PROCESSING
Volume 90, Issue 8, Pages 2567-2580Publisher
ELSEVIER
DOI: 10.1016/j.sigpro.2010.03.003
Keywords
Time delay estimation; Depth-invariant Q-model; CRLB; Frequency power law; Vandermonde structure; Ground penetrating radar
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Funding
- Pays de la Loire Regional Council
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In this paper, we propose a modified matrix pencil method for the problem of time delay estimation in dispersive media obeying a particular frequency power law, namely, the constant-Q model. Being based on a Vandermonde decomposition of the prediction matrix, the matrix pencil method produces biased estimates when applied directly to data of the constant-Q model. The proposed approach allows to compensate for the bias inherent to the classical method by restoring the Vandermonde structure via a spline-interpolation technique. The restoration involves an iterative procedure where each iteration selects a set of interpolated samples depending on the value of the quality factor of the previous iteration. The algorithm is tested on simulated data representing radar acquisitions over a stratified dispersive medium, and its performance is assessed against the Cramer-Rao lower bound. (C) 2010 Elsevier B.V. All rights reserved.
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