Lucky ranging with towed arrays in underwater environments subject to non-stationary spatial coherence loss

Document Type

Conference Proceeding

Publication Date

5-18-2016

Abstract

This paper presents our new results on lucky ranging utilizing a towed array in environments subject to unknown fluctuating spatial coherence losses. We derive a lucky maximum likelihood range estimator based on the probabilistic assumption that each collected data snapshot is either coherent or purely incoherent with some probability. Our lucky range estimator can be interpreted as first ranking the coherence quality of each data snapshot according to an array gain-like quantity during the parameter search, followed by accumulation of likelihood surfaces out of data snapshots of high spatial-coherence. This effectively avoids the wash-out or the smearing results encountered in the traditional processing procedures of utilizing a long integration time without a prior screening for the data spatial-coherence. An important advantage of the lucky approach is that it makes no prior assumptions about the signal spatial coherence loss model. This estimator has greatly improved robustness over the conventional estimator when coherence is low and time-varying.

Identifier

84973322881 (Scopus)

ISBN

[9781479999880]

Publication Title

ICASSP IEEE International Conference on Acoustics Speech and Signal Processing Proceedings

External Full Text Location

https://doi.org/10.1109/ICASSP.2016.7472259

ISSN

15206149

First Page

3156

Last Page

3160

Volume

2016-May

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