Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1990-04-13
1991-05-14
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
342122, G01S 1334
Patent
active
050160168
ABSTRACT:
The device comprises, in a control loop of the subtractive beat frequency fb between transmitted waves and waves received as an echo, a pursuit discriminator (11) establishing the frequency fb at f.sub.0 and a pursuit validation circuit (12). This device is characterized by the combination of a contrast discrimination set (CDS (15 to 18) and a VSE discrimination set (21 to 25) for detecting energy in a guard band situated at the upper end of the frequency bands of the CDS, the latter comprising a contrast discriminator (15), a first attenuator (16) and controlling the pursuit validation circuit (12). The VSE discrimination set is arranged for controlling the gain of the first attenuator (16).
REFERENCES:
patent: 3588899 (1971-06-01), Strauch
patent: 3965428 (1976-06-01), Katz et al.
patent: 4024541 (1977-05-01), Albanese et al.
patent: 4200871 (1980-04-01), Roeder et al.
patent: 4728952 (1988-03-01), Residois
patent: 4739327 (1988-04-01), Konig et al.
patent: 4881077 (1989-11-01), Jehle et al.
Barron Jr. Gilberto
Kraus Robert J.
U.S. Philips Corporation
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