Clamoring for More Entertainment

Consumer expectations for information and entertainment are creating big challenges for airlines that need to provide Internet access while providing inflight services that mirror what’s available in the home and office.

Posted in: Articles, Aeronautics, Aerospace, Defense, Infotainment systems, Vehicle occupants, Displays, Commercial aircraft, Satellites

Cellular Satellites: Joint Communications with Integrated Acquisition

It’s a familiar image: a soldier crouching with a radio next to a spidery antenna pointing skyward to reach a distant satellite. But that view of military communications is on the verge of change, being replaced by troops rapidly exchanging data while moving seamlessly around the battle space.

Posted in: Articles, Aerospace, Defense, Satellite communications, Defense industry, Military vehicles and equipment

Virtual Flight Testing of Radar System Performance

Flight testing is the ultimate way to evaluate the performance of a radar system. During the actual aircraft flight, data such as Probability of Detection, Signal Strength, and clutter might be gathered. While effective, this approach does pose a number of challenges. The operational cost of flight testing a radar system using real aircraft can be over $100,000 per hour. Additionally, the results from one flight to the next are not repeatable. Each flight is slightly different, and getting enough flights in to be statistically significant is simply too cost-prohibitive.

Posted in: Articles, Aerospace, Defense, Computer simulation, Radar, Flight tests, Test equipment and instrumentation, Test procedures

Satellite System


Hughes Network Systems, LLC (Hughes) recently unveiled a new HM Satellite System, engineered around its novel software-definable modem (SDM) technology and scrambled code multiple access (SCMA) waveform. Hughes is launching with three commercial-off-the-shelf (COTS) products for government applications.

Posted in: Application Briefs, Aerospace, Defense, Suppliers, Satellites

Lithium Battery Pack


When designing an unmanned aerial vehicle (UAV), engineers must continually seek to reduce size and weight wherever possible in order to improve aerodynamics and free up critical space to deploy additional sensors and instrumentation.

Posted in: Application Briefs, Aerospace, Defense, Battery packs, Lithium-ion batteries, Suppliers

Digital Optical Comparator


VISIONx’s VisionGauge® Digital Optical Comparator 700 Series, featuring 5-axis inspection, has allowed aerospace supplier Paradigm Precision to improve the inspection process of its 16 different heat shields.

Posted in: Application Briefs, Aerospace, Defense, Optics

SIRE: A MIMO Radar for Landmine and IED Detection

Low-frequency ultra-wideband (UWB) radar has garnered attention for the detection of landmines and improvised explosive devices (IEDs) in recent years. The low frequencies used by these radars provide the necessary ground penetration capabilities for detection, and the wide bandwidth signals used are necessary for range resolution. Cross-range resolution that depends on the size of the antenna aperture can be improved by generating a synthetic aperture. Typical airborne synthetic aperture radars (SAR) that can provide high resolution in cross range are not practical for this problem due to cost limitations.

Posted in: Briefs, Aerospace, Defense, Radar, Hazards and emergency management, Protective equipment, Military vehicles and equipment

Multi-Temporal Analysis of Underbody IED Theater Events on Ground Vehicles

Modeling and simulation were used to analyze the effects of underbody blasts on moving vehicles.

Recently, modeling and simulation (M&S) engineers have made impressive strides in improving ground vehicle reliability and soldier safety. This work involved live-fire testing and evaluation (LFT&E) of the effects of underbody improvised explosive device (IED) blasts on moving ground vehicles. A multi-fidelity, multi-temporal M&S methodology was developed and successfully applied towards reconstruction of theater IED events.

Posted in: Briefs, Aerospace, Defense, Information Technology, Failure analysis, Crashworthiness, Impact tests, Military vehicles and equipment

Blast Mitigation Seat Testing

Blast energy-attenuation (EA) seats, although not new to the market, have not been fully tested with respect to energy attenuation capability and the resulting effects on occupant protection. The Ground Systems Survivability (GSS) Interiors Seat Team tested and evaluated EA seats over a one-year period using a drop tower test method.

Posted in: Briefs, Aerospace, Defense, Seats and seating, Protective equipment, Safety testing and procedures, Test equipment and instrumentation

Blast-Induced Acceleration in a Shock Tube

High-fidelity simulation of blast flow conditions can aid in developing strategies to mitigate blast-induced brain injury.

The prevalence of blast-induced traumatic brain injury (bTBI) has prompted an urgent need to develop improved mitigation strategies and advance medical care targeting casualties with bTBI. Despite considerable effort, the basic mechanisms of blast-induced brain injury are still undefined. Based largely upon computational modeling, several candidate mechanisms of nonimpact bTBI have been identified and include head acceleration. This work hypothesizes that explosion flow conditions can cause head acceleration sufficient to injure the brain, and that these inertial forces combine with other injury mechanisms to yield bTBI.

Posted in: Briefs, Aerospace, Defense, Medical, Computer simulation, Diagnosis, Medical equipment and supplies, Head injuries, Occupant protection