Reduced rank models for travel time estimation of low order mode pulses
Loading...
Authors
Chandrayadula, Tarun K.
Wage, Kathleen E.
Worcester, Peter F.
Dzieciuch, Matthew A.
Mercer, James A.
Andrew, Rex K.
Howe, Bruce M.
Subjects
Advisors
Date of Issue
2013-10
Date
October 2013
Publisher
Acoustical Society of America (ASA)
Language
Abstract
Mode travel time estimation in the presence of internal waves (IWs) is a challenging problem. IWs
perturb the sound speed, which results in travel time wander and mode scattering. A standard
approach to travel time estimation is to pulse compress the broadband signal, pick the peak of the
compressed time series, and average the peak time over multiple receptions to reduce variance. The
peak-picking approach implicitly assumes there is a single strong arrival and does not perform well
when there are multiple arrivals due to scattering. This article presents a statistical model for the
scattered mode arrivals and uses the model to design improved travel time estimators. The model is
based on an Empirical Orthogonal Function (EOF) analysis of the mode time series. Range-dependent
simulations and data from the Long-range Ocean Acoustic Propagation Experiment (LOAPEX)
indicate that the modes are represented by a small number of EOFs. The reduced-rank EOF model is
used to construct a travel time estimator based on the Matched Subspace Detector (MSD). Analysis
of simulation and experimental data show that the MSDs are more robust to IW scattering than peak
picking. The simulation analysis also highlights how IWs affect the mode excitation by the source.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1121/1.4818847
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Office of Naval Research (ONR) grants N00014-03-1-0181 and N00014-03-1-0182
ONR Graduate Traineeship Award N00014-06-1-0223
National Research Council Research Associateship Award
Office of Naval Research (ONR) Award N00014-12-1-0412
ONR Graduate Traineeship Award N00014-06-1-0223
National Research Council Research Associateship Award
Office of Naval Research (ONR) Award N00014-12-1-0412
Funder
Office of Naval Research (ONR) grants N00014-03-1-0181 and N00014-03-1-0182
ONR Graduate Traineeship Award N00014-06-1-0223
National Research Council Research Associateship Award
Office of Naval Research (ONR) Award N00014-12-1-0412
ONR Graduate Traineeship Award N00014-06-1-0223
National Research Council Research Associateship Award
Office of Naval Research (ONR) Award N00014-12-1-0412
Format
15 p.
Citation
J. Acoust. Soc. Am., Vol. 134, No. 4, Pt. 2 (October 2013) p. 3332-3346
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.