Award Data

High power transducer boots must undergo one of the most stringent stress profiles of any underwater encapsulation. Added to the hydrostatic and vibratory fatigue stresses are the problems that come with moving frictional contact - abrasion and heating. Abrasion resistant materials are typically not heat resistant, and fatigue resistant materials are not good at sustaining heat, abrasion, and we ...

Research is currently underway to produce guidelines for the development of mission and safety critical systems implemented in Ada 95. This research will analyze whether certain features of Ada 95 should be included or excluded from a critical application. To be of practical value such an analysis will require specific tool support. The Ada Semantic Interface Specification (ASIS) defines a ...

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 ...

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 ...

We have designed an innovative adaptive-optics system to provide correction for laser beam distortion by large atmospheric turbulences such as in an aircraft boundary-layer. The adaptive-optics design is applicable to laser-based infrared countermeasure systems, laser rangefinders, and laser target designators. Our design is a new approach that specifically address large-scale turbulence in t ...

The Monolithic Analog Signal Conditioner (MASC) project described by NSWC TM 951128 dealt specifically with many of the issues associated with developing a high bandwidth, high dynamic range application specific integrated circuit dedicated to the function of conditioning sensor signals prior to digitization. Since most of the MASC candidate sensor signals are destine to be digitized, there ...

Airborne SAR systems currently exist and are used for wide-area surveillance and ground mapping. The majority of deployed systems have frequencies (400 MHz-30 GHz) which, in most cases, cannot penetrate the soil to the depth required for detection of buried mines and unexploded ordnance. Lower frequencies are required for penetration of the ground. However, in the lower parts of the frequency spec ...

We shall develop a dynamic agent web architecture and software prototype that builds on top of COTS database integration technology to deliver view management and data mining services.The data mining services shall consist of case based reasoning and association. We shall use case based reasoning and association agents in identifying new links and relationships within data contain in shipboar ...