Award Data

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The overall objective of Phase I and Phase II is to develop (1) the mathematical means to design, control, and modify a minesweeping operation in order to minimuze the time needed to nullify a minefield with specified assets in the light of intelligence, surveillance, and reconnaissance (ISR) products that become available befor and during the mine countermeasure operation and (2) a software imple ...

In order to maintain acoustic advantage, submarine crews need to assess acoustic vulnerability for historical and planned tracks and own ship noisy evolutions. A TDA or TDAs that produce acoustic advantage and vulnerability overlays for the geographic plot are essential to this. Our Phase I effort will develop a MATLAB-based TDA tool engine that when provided with the required inputs (own ship, en ...

DDL OMNI Engineering proposes to design a secure system for the continuous, real time acoustic measurement of towed array position relative to the host submarine. By using focused transmit and receive assemblies, pseudo- random spread broadband signals, and relatively high carrier frequency, the transmission level will be minimized so as to be virtually undetectable by a non-dedicated system ...

Composite materials find increasing importance as structural materials for modern lightweight and low cost aircraft. Structures using composite materials essentially rely on the integrity of adhesive bonds for their structural stability. A major limitation in employing composites in critical structures is that the existing methods of testing the integrity of structures are not adequate to a ...

THE PROBLEMS OF ATTENUATING DUCTED NOISE AND DISTRIBUTED NOISE ARE ADDRESSED USING ACTIVE NOISE CANCELLATION TECHNIQUES. FOR DUCTED NOISE, A COMBINATION OF COMMERCIAL ANC EQUIPMENT WITH LOW PRESSURE DROP MUFFLERS IN AN SVS PROPRIETARY CONFIGURATION WILL BE EXAMINED. COST AND PERFORMANCE TRADES BETWEEN THE ACTIVE CONFIGURATION AND PASSIVE MUFFLERS WILL BE MADE AND AN EXPERIMENT WILL BE DESIGNED FOR ...

Anti-Submarine Warfare (ASW) acoustic mission planning is a very complex problem that needs to take into account many factors to achieve overall mission objectives. Blue Force capabilities and vulnerabilities, Red Force capabilities and vulnerabilities, ASW mission posture and priority, search time allocation, area size, and environmental factors all play a significant role in determining the best ...

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This project proposes preliminary investigations to prove the feasibility of four techniques for improving Adaptive Beamforming performance in littoral environments. Emphasis is placed on tradeoffs between algorithm efficiency and performance. The littoral acoustic environment is characterized by near and far field targets and dense dynamic near and far field directional interference at man ...

Amron and its subcontractor BBN propose to show the feasibility of a broadband time-domain adaptive beamformer (ABF) to suppress uncorrelated narrowband sources and multipaths from correlated impulsive sources. The work is motivated by political developments which have emphasized warfare in littoral areas, where a key problem facing active sonar is scattering from topographic features. Activ ...