Phase-shift-based time-delay estimators for proximity acousticsensors |
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Authors: | Xi Li Larsson E.G. Sheplak M. Jian Li |
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Affiliation: | Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL; |
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Abstract: | Time-delay estimation is important in a wide range of applications in oceanic engineering. In this paper, we present a novel time-delay estimation algorithm based on maximum likelihood theory for the case that the measurements are corrupted by colored or nonuniform zero-mean Gaussian noise. It turns out that the likelihood function associated with the problem is highly oscillatory, and we propose a computationally efficient technique to maximize this function. Our algorithm first obtains an initial estimate based on a smooth approximate cost function, and then refines this estimate based on the true cost function. Simulation results show that our estimator outperforms a traditional phaseshift based estimator, and that the estimation error approaches the Cramer-Rao bound when the SNR increases without bound |
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