Broadband Processing in a Noisy Shallow Ocean Environment: A Particle Filtering Approach

Journal Article · Thu Apr 14 00:00:00 EDT 2016 · IEEE Journal of Oceanic Engineering

DOI:https://doi.org/10.1109/JOE.2016.2521243· OSTI ID:1262184

Candy, J. V. ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here we report that when a broadband source propagates sound in a shallow ocean the received data can become quite complicated due to temperature-related sound-speed variations and therefore a highly dispersive environment. Noise and uncertainties disrupt this already chaotic environment even further because disturbances propagate through the same inherent acoustic channel. The broadband (signal) estimation/detection problem can be decomposed into a set of narrowband solutions that are processed separately and then combined to achieve more enhancement of signal levels than that available from a single frequency, thereby allowing more information to be extracted leading to a more reliable source detection. A Bayesian solution to the broadband modal function tracking, pressure-field enhancement, and source detection problem is developed that leads to nonparametric estimates of desired posterior distributions enabling the estimation of useful statistics and an improved processor/detector. In conclusion, to investigate the processor capabilities, we synthesize an ensemble of noisy, broadband, shallow-ocean measurements to evaluate its overall performance using an information theoretical metric for the preprocessor and the receiver operating characteristic curve for the detector.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1262184
• Report Number(s): LLNL-JRNL--676434
• Journal Information: IEEE Journal of Oceanic Engineering, Journal Name: IEEE Journal of Oceanic Engineering Journal Issue: 99; ISSN 0364-9059
• Country of Publication: United States
• Language: English

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Kullback-Leibler divergence
broadband Bayesian processor
information theory
littoral region
normal-modes
particle filter
performance metrics
sequential Monte Carlo
sequential detection