Award Data

Tahoe RF"s will develop"BeamDirect,"a phased array beam forming & beam steering system which incorporates the LO Phase Shifting technology developed during the Phase I activities. The system will perform as a broad band phase array antenna receiver from 100 MHz to a 6 GHz in conjunction with a circular broadband antenna. This system will provide exceptional SNR and BER and is targeted to improve i ...

Yotta Navigation and The Ohio State University propose to develop a complete diver text messaging and locator system. The system will securely transmit preformatted and free-text messages, and will be able to accurately determine range and bearing, at distances of up to 1000 meters. This system consists of two major components. A multimode receiver and transmitter, mounted on a swimmer delivery ve ...

Future military communication systems will rely on advanced superconductor digital electronics. These electronics will require efficient cooling at low temperatures near 4 K. Pulse-tube cryocoolers are a candidate cooling technology for this application. We propose to improve the efficiency of the pulse-tube cryocooler by addressing one of its primary performance limitations, namely the performanc ...

The performance of modern combustion systems used in propulsion devices (such as gas turbine main combustors, augmentors, and rockets) is largely dependent on the mixing of fuel and oxidizer. This mixing process, often involving a liquid jet emanating into a gaseous flow followed by subsequent breakup and atomization, is critically important to many performance metrics including thrust, efficiency ...

The Navy has need of assessing the river environment including bathymetry, flow velocity profile, and navigational obstructions. While improvements in measurement fidelity and reduction in cost have come about by the use of multiple drifters, measurement quality is lost due to convergent drifter trajectories, and cost/risk remains high due to personnel effort required for deployment. An autonomous ...

The primary objective of Phase II is to obtain experimental test data to substantiate the analytic predictions developed during Phase I (4.0 W at 60.0K, 0.30 W at 11.5K, and 0.196W at 4.0K for 800 W of input pressure-volume (PV) power). This will be accomplished by leveraging a new purpose-built pulse tube cold head with existing cryocooler assets to be provided by the United States Air Force. Thi ...

As with all service branches within the Department of Defense (DoD), the mission objectives of the Navy are expanding to encompass not only major combat operations, but also asymmetric warfare scenarios. This expanding role requires the Navy to increasingly operate in littoral waters where effective identification of small craft and semi-submersibles is a critical capability for both fleet protect ...

Over-The-Horizon (OTH) radar plays a crucial role in naval situational awareness and the ultimate safety of the naval warfighter and navy assets. Traditionally, OTH detection has been enabled by large land based radars exploiting the interaction of high frequency (HF) radio waves with the ionosphere, but this method is susceptible to instabilities in propagation and the limitations of HF systems. ...

Modern supersonic jet aircraft engines produce a high amplitude noise field with complicated characteristics due to turbulent behaviors of the hot jet. Researchers need better understanding of the turbulent structures in the jet plume to develop treatments to engines that might reduce the noise emissions. A significant obstacle to making these simulations practical and realistic for engine design ...

A diagnostic is proposed for aircraft engine exhausts that provides three velocity components at each point in an image of a slice through the plume. The method measures the Doppler shift of laser light scattered from soot particles naturally present in the exhaust, and may also be useful for measuring non-combustion flows outside the exhaust using naturally occurring environmental aerosols. An im ...