Keyword: Transmissions

Articles: Aerospace

There are many advantages to utilizing active electronics versus the passive systems often used in aircraft applications, such as pressure, temperature, and flow sensors....

Articles: Aerospace

A single antenna can be used for both transmission and reception. To accomplish this, the transmission must be isolated from the reception. In Figure 1, a radio frequency...

Briefs: Aerospace

Nuclear powered submarines can stay submerged for days at a time and only have to come to periscope depth (PD) for...

Articles: RF & Microwave Electronics

Consumers have shown that they are eager to be rid of cabling and wires connecting them to devices situated or worn near or on the body. From athletic monitoring devices to...

Articles: RF & Microwave Electronics

The Eurofighter Typhoon is a state-of-the-art combat aircraft. BAE Systems has been working with other leading aerospace companies to make sure the Eurofighter Typhoon...

Briefs: Physical Sciences

The Army has acquired several hybrid platforms to assess the applicability of hybrid technology for military missions. These hybrid platforms include both series...

Briefs: Electronics & Computers

The Distributed Jammer Network (DJN) is composed of a large number of tiny, low-power jammers, which are distributed inside a target network and emit radio energy to disrupt its communications. Recent...

Briefs: Electronics & Computers

Recent years have seen a burgeoning interest in the physics and applications of metamaterials. Briefly, metamaterials consist of a periodic array of subwavelength structures that...

Application Briefs: RF & Microwave Electronics

In the 1990s, when laying the groundwork for its missile defense shield, the Pentagon realized that if it wanted to provide an effective defense against ballistic missile attack, it...

Briefs: Materials

An acoustic crystal composed of tightly packed spherical particles can exhibit a wide spectrum of acoustic properties with responses varying from linear to highly nonlinear...

Briefs: Physical Sciences
Acoustic Detection Using Reverberation

Acoustic detection of undersea objects is difficult due to the uncertain environment and even more difficult when the objects are buried in the seabed. First, sediments generate high backscattering noise due to heterogeneous scatters within the sediments, clouding the object.

Briefs: Information Technology
Data Fusion of Geographically Dispersed Information for Test and Evaluation

Test and evaluation relies on computer collection and manipulation of data from a myriad of sensors and sources. More computing power allows for increases in the breadth and depth of the information collected. The same computing power must assist in identifying,...

Application Briefs: RF & Microwave Electronics

Fuel is one of the top three logistics drivers on the battlefield, along with water and ammunition. Fuel powers the vehicles that mobilize troops and keep communications and supply chains running, and is used in the...

Briefs: Physical Sciences
Compressive Oversampling for Robust Data Transmission in Sensor Networks

A paper discusses recent developments in the area of Compressive Sensing (CS) for data loss in wireless sensing applications. Since many physical signals of interest are known to be sparse or compressible, employing CS not only compresses the data and reduces the effective...

Briefs: Physical Sciences

Current chemical-protection gear for warfighters on the ground inhibits electronic communication via keyboards, cell phones, and remote-control devices. To improve communications capabilities...

Briefs: Sensors/Data Acquisition

The Wide-Field Dynamic Range (WFDR) camera is a high-sensitivity, wide-field-of-regard sensor of importance to future military surveillance and survivability systems. It is intended to be used in harsh, noisy...

Briefs: Information Technology

A wireless transmission system provides high-quality video transmission over severely impaired wireless links between nodes that are connected within airborne networks. The target bit rate...

Briefs: Photonics/Optics

Externally coupled electroabsorption modulators (EAMs) are commonly used in order to transmit RF signals on optical fibers. Recently, an alternative...

Briefs: Electronics & Computers
Cooperative Single-Antenna Node Networks

Future tactical networks will be complex, with severe constraints on energy and bandwidth, operating in dynamic and unpredictable environments. By exploiting the broadcast nature of the wireless medium and spatially dispersed nodes, some of these advantages can be realized through cooperation among...

Articles: Aerospace

A Training and Tactical ORS Operations (TATOO) Laboratory is being developed by Star Technologies Corp. under the direction of the Air Force Research Laboratory...

Articles: Imaging

Video plays a crucial role in defense and security, and video streams are now used in armored vehicles for target acquisition, Local Situation Awareness, and other military...

Briefs: Information Technology
Simulation of a Flywheel Energy-Storage System

A computational model has been developed to simulate the operation of a laboratory flywheel energy-storage system that is a subsystem of the Flywheel Attitude Control, Energy Transmission, and Storage (FACETS) system located at Kirtland Air Force Base in New Mexico. The FACETS, which includes three...

Briefs: Electronics & Computers

Acomputational-simulation study of two ferrocene-based molecular electronic devices was performed as part of a continuing effort to develop a capability for ab initio design of...

Briefs: Photonics/Optics

A program of research and development has been directed toward the goals of demonstrating (1) ultra-low-noise communication links in which information is conveyed by phase-modulated...