Shallow Water Beamformer

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$69,988.00
Award Year:
2004
Program:
STTR
Phase:
Phase I
Contract:
N00014-04-M-0233
Award Id:
70418
Agency Tracking Number:
N045-011-0415
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
9607 Jomar Drive, Fairfax, VA, 22032
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
140785929
Principal Investigator:
Russell Jeffers
Chief Scientist
(703) 795-8574
russ.jeffers@3phoenix.com
Business Contact:
Joseph Liverman
President
(571) 331-9431
andy.liverman@3phoenix.com
Research Institution:
George Mason University
Kathleen Wage
230 Science and Technology II, 4400 University Drive
Fairfax, VA, 22030
(703) 993-1569
Nonprofit college or university
Abstract
Spatial processing for Navy arrays has been designed in nearly all cases based on the a horizontally propagating plane wave model, the underlying assumption being that energy arrives from far field targets as a superposition of free field traveling waves at frequencies determined by the target signature. For most situations this model has been considered "good enough", particularly in deep water operations. Multi-path, has been ignored in spatial processing and dealt with in various ad hoc ways for target localization. It is well known that acoustic propagation is much more complex than the simple model due to boundary interactions (as evidenced by multi-path), sound velocity variability, and other more complicated effects. These effects are most prominent in shallow water and at low frequencies where surface and bottom interactions are prevalent. Shallow water environment presents the technical challenge of designing beamformers based on a suitable shallow water signal model rather than the simple horizontal plane wave assumption. Our proposal is to design such a beamformer based on state-of-the-practice characterization of shallow water sound fields. We will focus our efforts first on horizontal line arrays (design will be extendable to volumetric arrays), and surface noise sources (ships and surf hot spots).

* information listed above is at the time of submission.

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