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News Details

News Date: 4/15/2012   

News Title: ElectroDynamic Applications and GMR Research & Technology are featured in SBIR success stories

News Subject:

Two SBIR success stories have been posted to the Publications section of this web site (see the Innovation success story folder).

Air vehicles flying at hypersonic speeds need reliable radio frequency (RF) systems to perform communication, navigation, targeting, and terminal guidance; plasma generated around a vehicle traveling at hypersonic velocities can be a significant impediment to fixed-frequency communications, particularly for global positioning system (GPS) navigation signal reception. The Hypersonic Plasma Adaptive Sensor System (HyPASS), developed by ElectroDynamic Applications, Inc. (EDA), located in Ann Arbor, Michigan, addresses the plasma-generation impediment problem by implementing an antenna matching system. HyPASS consists of both hypersonic plasma diagnostics and antenna matching to recover lost signal strength between the antenna and receiver from mismatches caused by the hypersonic plasma layer. In addition to military hypersonic vehicles and military and civilian re-entry capable spacecraft, HyPASS will be potentially valuable to a variety of terrestrial applications as well as electric propulsion thruster testing, high-power energy research, and other systems involving plasmas. The AFRL Sensors Directorate manages this SBIR project.

Receiver systems in many applications require increasing bandwidth while maintaining or increasing their linear dynamic range; nonlinear equalization (NLEQ) and interleaved nonlinear equalization (iNLEQ) can significantly increase the linear dynamic range of radio frequency (RF) receiver systems that suffer from harmonic or channel mismatch distortions. GMR Research & Technology, Inc., located in Concord, Massachusetts, demonstrated a successful real-time approach for extending receiver bandwidth and increasing dynamic range; this is achieved by using multiple parallel interleaved channels combined with two proprietary digital techniques. These techniques compensate for harmonic distortions caused by saturation in amplifiers and harmonic non-idealities in analog-to-digital converters (ADCs), as well as interleaved channel mismatch distortions caused by timing errors and differences between channels’ complex linear, nonlinear, and DC characteristics. Military radar systems, for which increased linearity (or reduced spurs) represent the ability to detect and estimate smaller or farther targets, are expected to benefit from this technology. This SBIR project is managed by the AFRL Sensors Directorate.

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