Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-05-20
1983-09-06
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 68LC, G01S 1376, G01S 1380
Patent
active
RE0313750
ABSTRACT:
A transponder-responder system is provided which comprises a home station and at least one remote station. A transmitter at the home station periodically generates interrogation pulses by means of a directional sweep antenna across a search area. Each remote station includes a receiver and transmitter. Upon receipt of an interrogation pulse by the remote station receiver and while enabled, the remote station transmitter transmits a digitally encoded response signal which is received by a receiver at the home station. Upon receipt of the response signal by the home station receiver, timing circuitry at the home station determines the distance between the home and remote station by measuring the elapsed time between the transmission of the last interrogation pulse and the receipt of the response signal. Additionally, the home station includes circuitry which determines the rotational position of the sweep antenna and circuitry which decodes the response signal.
REFERENCES:
patent: 3243801 (1966-03-01), Bell et al.
patent: 3406394 (1968-10-01), Lyons
patent: 3737901 (1973-06-01), Scott
patent: 3750168 (1973-07-01), Schrader et al.
patent: 3778833 (1973-12-01), Castrovillo et al.
patent: 3866221 (1975-02-01), Hikosaka
patent: 3945006 (1976-03-01), Cleeton
Romanauski James A.
Sellers John C.
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