Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1996-05-31
1998-09-15
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
342 6, G01S 1378
Patent
active
058085777
ABSTRACT:
The invention is an identification friend or foe system for an aircraft providing identification information when illuminated by an incident radar signal. In detail, the system includes at least a portion of the aircraft's surface incorporating magnetic material for absorption of at portion of the incident radar signal with the remainder reflected and scattered back in the direction of the incident radar signal. A electromagnetic coil assembly) is positioned behind the aircraft skin and is used to impress a biasing field on a portion of the aircraft's surface incorporating the magnetic material such that the biasing field modulates the reflected and scattered signal. A system is coupled to the coil assembly to modulate the biasing field such that the reflected and scattered signal from the portion of the aircraft's surface incorporating the magnetic material is modulated with an encoded signal incorporating the identification information.
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Lockheed Martin Corporation
Schruhl Robert A.
Sotomayor John B.
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