Phase-shift-based time-delay estimators for proximity acoustic sensors
2002 (English)In: IEEE Journal of Oceanic Engineering, ISSN 0364-9059, Vol. 27, no 1, 47-56 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2002. Vol. 27, no 1, 47-56 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-77133DOI: 10.1109/48.989885OAI: oai:DiVA.org:liu-77133DiVA: diva2:525152