Signal Subspace Smoothing Technique for Time Delay Estimation Using MUSIC Algorithm
Résumé
In civil engineering, Time Delay Estimation (TDE) is one of the most important tasks forthe media structure and quality evaluation. In this paper, the MUSIC algorithm is applied to estimatethe time delay. In practice, the backscattered echoes are highly correlated (even coherent). In order toapply the MUSIC algorithm, an adaptation of signal subspace smoothing is proposed to decorrelatethe correlation between echoes. Unlike the conventional sub-band averaging techniques, we proposeto directly use the signal subspace, which can take full advantage of the signal subspace and reducethe influence of noise. Moreover, the proposed method is adapted to deal with any radar pulse shape.The proposed method is tested on both numerical and experimental data. Both results show theeffectiveness of the proposed method.
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