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Briefs

Photonics/Optics

Photonic Recirculating Delay Line for Analog-to-Digital Conversion

Aconventional analog fiber-optic link can be augmented with a recirculating optical delay loop so as to realize an optically assisted analogto- digital converter (ADC) that...

Briefs

Mechanical & Fluid Systems

Stability Analysis of Distributed Engine Control Systems

Full Authority Digital Engine Control (FADEC), based on a centralized architecture framework, is being widely used for gas turbine engine control. However, current FADEC is not able to...

Briefs

Information Technology

Optimized Robust Adaptive Networks in Supervisory Control and Data Acquisition Systems

The Electric Power and Communica - tion Synchronizing Simulator (EPOCHS) system could provide great benefits to private industry and Department of Defense (DoD) power systems infrastructure by allowing simultaneous, synchronous simulation of communication and...

Articles

Test & Measurement

Fiber Interferometry for Testing Military Avionics

Fiber-optic networks have benefited from nearly 20 years of continuous expansion (notwithstanding the brief, yet surprisingly quiet period from 2002 to 2005). For terrestrial networking, this...

Articles

Aerospace

Electrically Driven General Systems for UAVs

General systems are defined as all of the flight safety critical systems of an aircraft, excluding the engine and flight control computing. Usually, the main subsystems in a general system include...

Articles

RF & Microwave Electronics

Demodulating Over-the-Air Communications

Today, modern radio designs have made a predominant shift to the software-defined radio architecture. From cellular handsets to military communications devices, the flexibility to use multiple wireless...

Briefs

Software

Medical Information Network Decision Support System

In order to facilitate a more rapid and systematic transfer of new medical knowledge and capabilities into mainstream clinical practice, a new Medical Information Network Decision Support (MINDS) system has been proposed. This system is intended to be a platform for storing and fusing medical data...

Briefs

Data Acquisition

Multi-Agent Software for Airspace Control in the Combat Zone

AGENTFLY software is part of a computer-based system technology that will enhance airspace operation, providing ever-increasing support to personnel without freeing them from the ultimate responsibility. AGENTFLY features distributed coordination mechanisms based on collective...

Articles

Aerospace

Middleware Offers Integration Framework for Dynamic UAV Applications

Unmanned Aerial Vehicles (UAVs) like the MQ-1 Predator have excelled in the theaters of war in which they have been deployed. However, the ability of those controlling the UAV...

Briefs

Software

Software Suite for a Large Defense System

A suite of software tools was developed to enable networks composed of many hundreds, thousands, or even millions of commodity computers to protect themselves against a variety of security threats. These tools include Anagram, a content-based anomaly detection (AD) tool; ASSURE, which provides automatic...

Briefs

Physical Sciences

MEMS-Based Optical Limiter

Protecting optical sensors and detectors against excessive input signals is not only important for dealing with unintentional overloads, but also central for protecting sensors against intentional high-intensity...

Articles

RF & Microwave Electronics

Wireless Sensor Network with Geolocation

Maintaining situational/positional awareness in indoor and urban environments is difficult because buildings, walls, and other obstacles obstruct vision and RF propagation. Propagation channels are...

Briefs

Physical Sciences

Tightly Coupled INS, GPS, and Imaging Sensors for Precision Geolocation

To address the issue of poor georegistration performance for small unmanned aerial vehicles (UAVs), navigation and target-location accuracy improvements achievable by tightly integrating an image-based feature-tracking algorithm with Global Positioning System (GPS) and a...

Briefs

Photonics/Optics

Photon-Counting Chirped Amplitude Modulation Ladar

This work is a follow-on to an effort to develop a method using Geiger-mode avalanche photodiode (GM-APD) photon-counting detectors in the U.S. Army Research Laboratory’s chirped amplitude...

Briefs

Electronics & Computers

Asynchronous Architectures for Large-Integer Processors

New architectures have been developed for cryptographic hardware that offer high throughput, algorithm flexibility, radiation hardness, and low power. The asynchronous (clockless) architecture combines a dedicated large-integer processor (LIP), a field programmable gate array (FPGA), and a...

Briefs

Information Technology

Next-Generation Information Systems Architectures

A document describes a paradigm in which low-altitude unmanned aerial vehicles (UAVs) with wireless communication capability are used to assist networking among a set of ground stations. This new paradigm is attractive because UAVs can be dynamically deployed in a wide variety of geographical...

Briefs

Electronics & Computers

Using High-Performance Computing Clusters to Support Fine-Grained Parallel Applications

A heterogeneous cluster comprised of host processors and field programmable gate arrays (FPGAs) was used to accelerate the performance of parallel...

Briefs

Electronics & Computers

Implementing On-Board Cloud Detection on a Reconfigurable Computer

Reconfigurable Computers (RCs) combine traditional microprocessors with field programmable gate arrays (FPGAs), and are characterized by lower form/wrap factors compared to...

Briefs

Electronics & Computers

Fuzzy System for Fault Diagnostics in Power Electronics-Based Brake-by-Wire System

Research in fuzzy diagnostics of brake-by-wire systems focuses on the power electronics switches, since they are often considered to be the weakest link in the...

Briefs

Electronics & Computers

High-Voltage, High-Temperature Power Electronics Capacitor

A novel high-temperature, high-voltage power electronics capacitor incorporates materials of construction and electrical components that have been initially designed as a segment of an...

Articles

Defense

Applying Reconfigurable Computing to Acoustic Sensors

There is growing interest in the U.S. Armed Forces in the development of microsensor systems that are easily deployed and that support reconnaissance, surveillance, and target acquisition...

Briefs

Information Technology

Explicitly Timed Authorization Logic

A document describes explicitly timed authorization logic (nicknamed "η-logic"). In prior authorization logics, it is, variously, impossible or difficult to handle time explicitly; express security policies that involve complex, time-dependent relationships; or reason accurately about time. By enabling...

Briefs

Information Technology

C++ Architecture for Simulating UAVs

A conference paper describes the use of the CADAC++ software system for simulating operations of uninhabited aerial vehicles (UAVs) in conjunction with moving ground targets while interacting with other UAVs and with satellites that assist in targeting. CADAC++ was developed by rewriting the prior...

Articles

Electronics & Computers

Rugged Computing Power for Small Platforms

Sensor-based imaging systems generate invaluable information for modern warfare, but a serious challenge exists to the timely use of that information. Data links that provide the transmission backbone...

Briefs

Information Technology

Fusion of Image- and Inertial-Sensor Data for Navigation

Amethod of real-time fusion of readout data from electronic inertial and image sensors for passive navigation has been developed. By "passive navigation" is meant navigation without the...

Briefs

Electronics & Computers

Applying Reconfigurable Computing to Acoustic Sensors Using FPGAs

A novel microsensor processing architecture allows a field-programmable gate array (FPGA) to act as a reprogrammable preprocessor or coprocessor to a general-purpose processor...

Briefs

Electronics & Computers

Software-Defined Radios for Urban and Indoor Navigation

Software-defined radios (SDRs) are being developed to provide positioning and communication (POSCOMM) services inside buildings and tunnels, under tree canopies, and in other environments...

Briefs

RF & Microwave Electronics

Implementing a GPS Waveform Under the SCA

A continuing development effort focuses on implementation of a Global Positioning System (GPS) waveform under the Software Communications Architecture (SCA). [As used within the special technological...

Application Briefs

RF & Microwave Electronics

Microwave RF Amplifier Boosts Communications Power

When you watch TV or use a cell phone, amplifiers make the signal stronger or the voice clearer. A hybrid, high-powered microwave amplifier from Aria Microwave Systems of Teaneck, NJ enables...