Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1988-09-12
1990-08-28
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
342175, 455168, 455319, 455325, G01S 7285, H04B 128
Patent
active
049529366
ABSTRACT:
The invention concerns radar detection devices sensitive to signals from various different frequency bands. A broad band antenna is provided, together with a mixer and a plurality of local oscillators. Signals from the local oscillators are mixed one at a time with signals from the antenna, there being one local oscillator signal for each radar frequency or pair of frequencies of interest which may be received by the antenna. Each local oscillator signal is chosen so that when it is mixed with the respective radar frequency signal, an intermediate signal is produced which is the same for all mixtures. This intermediate signal is further down converted and fed to signal processing circuitry to produce an alarm when radar frequencies of interest are detected.
REFERENCES:
patent: 2460900 (1949-02-01), Newbold
patent: 4461041 (1984-07-01), Dobrovolny
patent: 4613989 (1986-09-01), Fende et al.
patent: 4630054 (1986-12-01), Martinson
patent: 4691379 (1987-09-01), Shizune
Hislop, "An 88-100 GHZ Receiver Front End", Conf. 1979 IEEE INT Microwave Symposium Digest, Orlando, Fla., U.S.A., pp. 222-223, Apr. 30-May, 2, 79.
B.E.L-Tronics Limited
Barron Jr. Gilberto
Hewson Donald E.
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