Reduced rank models for travel time estimation of low order mode pulses
Chandrayadula, Tarun K.
Wage, Kathleen E.
Worcester, Peter F.
Dzieciuch, Matthew A.
Mercer, James A.
Andrew, Rex K.
Howe, Bruce M.
MetadataShow full item record
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.
The article of record as published may be found at http://dx.doi.org/10.1121/1.4818847
Showing items related by title, author, creator and subject.
Backus, Larry Allen (1969);The study reports an investigation of the effects caused by the color of a moving light source on the ability of subjects to estimate the velocity of that light source. The variable used for comparison was travel time ...
Analysis and modeling of the acoustic tomography signal transmission from Davidson Seamount to Sur Ridge : the forward problem Onofre, Jose Alberto de Mesquita. (Monterey, California. Naval Postgraduate School, 1999-09);The repeated transmissions of a tomography signal from an autonomous sound source placed on Davidson Seamount was continuously monitored by a bottom- lying, cabled-to-shore receiver on Sur Ridge. To address the signal ...
HMM and auction-based formulations of ISR coordination mechanisms for the expeditionary strike group missions An, Woosun; Park, Chulwoo; Pattipati, Krishna; Kleinman, David L.; Kemple, William G. (2009-06);In this paper, multi-stage auction-based intelligence, surveillance, and reconnaissance (ISR) coordination mechanisms are investigated in the context of dynamic and uncertain mission environments, such as those faced by ...