Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1996-12-18
2000-02-15
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
G01S 1378
Patent
active
060257954
ABSTRACT:
A covert and secure communication system which employs a very narrow bandwidth to permit receivers to be very sensitive to low power signals while maintaining acceptable signal-to-noise ratios. In the preferred embodiment, the system operates at the millimeter wavelength which, because of very high attenuation in atmosphere, will be undetectable beyond a very limited range. In another embodiment of the invention, the covert communication system is applied to an IFF system in conjunction with a homing missile. The IFF system of the present invention may be used as a back-up to confirm that a target is a foe by transmitting to and receiving a confirming signal from the target at the terminal portion of the engagement. For example, transmission between the target and missile may occur when the target and missile are less than 2,000 feet apart. The system is even less detectable and more secure because transmission only occurs during the very last portion of missile engagement which avoids the long range transmission of conventional IFF systems.
REFERENCES:
patent: 5001488 (1991-03-01), Joguet
patent: 5327145 (1994-07-01), Jelinek
Drewes Bernard W.
Hagelberg Allen C.
Hulderman Garry N.
Alkov Leonard A.
Collins David W.
Lenzen, Jr. Glenn H.
Pihulic Daniel T.
Raytheon Company
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