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Bae Systems Information and Electronic Systems Integration Inc.

John Cosenza

Fred Bassali

Richard J Lavery

Gary A Schay

Robert F Saracino

Michael S Murphy

Techniques are provided for an Identification Friend or Foe (IFF) transponder. A system implementing the techniques according to an embodiment includes an antenna array configured to operate in an omnidirectional mode and a steered directional mode. The system also includes a receiver configured to receive signals provided through the antenna array while operating in the omnidirectional mode and a detector configured to detect an IFF interrogation message in the received signals. The system further includes an angle of arrival (AOA) estimator configured to operate the antenna array in the steered directional mode to estimate an AOA of the IFF interrogation message. The system further includes a transmitter configured to operate the antenna array in the steered directional mode to transmit an IFF response message in the estimated AOA direction. The transmit power of the IFF response message may be based on, for example, the steering gain of the antenna array.

Multi-element aperture for identification friend or foe (IFF) transponder systems

An assembly comprising a horizontal GPS patch antenna element and a vertical IFF antenna element providing simultaneous high performance IFF communication and GPS reception with minimal IFF to GPS interference. The IFF element can be a monopole element. A second monopole co-linear with the IFF element can provide simultaneous UHF communication. In embodiments, the assembly is a blade that can replace an existing IFF blade on an aircraft or other asset. Separate IFF and GPS connectors can be provided, or a single connecter can be shared using an integral diplexer. Embodiments include a GPS preamplifier integral with the blade. In other embodiments, the IFF element is an annular slot transponder that is centered on the GPS patch element. System embodiments include bandpass filters and/or GPS blanking to further protect the GPS receiver from IFF transmissions.

Dual-band GPS/IFF antenna

A microwave measurement system is utilized for the determination of displacement of a piston in a fluid filled cylindrical structure. The piston plus cylindrical encasement of the hydraulic system is modeled as a uniform cylindrical waveguide terminated in a metal plate. A novel shaped probe antenna to measure the slope of the relative phase of the reflected equivalent voltage wave with respect to frequency. The idea to measure the slope of the relative phase is novel and requires a new antenna structure. Instead of using the phase slope with respect to frequency, the total phase shift in a given frequency range is used to determine the location of the piston in the cylindrical chamber. Simulation and measurement will be used to determine the impedance of the antenna as well as the electromagnetic field at different locations inside the cylinder. In addition, the antenna will be analyzed to optimize its design, which ought to result in minimizing the reflections.

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Coram, NY, United States of America

John Cosenza