Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1987-12-08
1990-03-20
Griffin, Robert L.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 45, 370 74, 370 691, 246 7, H04B 150
Patent
active
049107933
ABSTRACT:
Information is transmitted at microwave frequencies, the ground station being connected to a waveguide (25) and the station aboard a railway vehicle being connected to an antenna (26). Each station comprises a microwave generator (19) supplying a carrier, transmitters (3 through 7) supplying subcarriers, receivers (28 through 32) and a pilot generator (1). The carrier and subcarrier frequencies are multiples of the pilot frequency and the frequency difference between adjacent subcarriers equals the pilot frequency. A transmitter mixer (MTX) receives the carrier and the subcarriers and is connected to a circulator (24), itself linked to the waveguide (25) in the ground station and to the vehicle station antenna. A receiver mixer (MRX) is connected via a filter (23) to the circulator (24) and receives the carrier from the microwave generator; the latter mixer is connected to the receivers (28 through 32) to which it sends the subcarriers transmitted by the other station.
REFERENCES:
patent: Re28867 (1976-06-01), Baba et al.
patent: 2635233 (1953-04-01), Homrighous
patent: 3629707 (1971-12-01), Baba
patent: 3743935 (1973-07-01), Alt
patent: 3750020 (1973-07-01), Baba et al.
patent: 4078245 (1978-03-01), Johnson et al.
patent: 4517562 (1985-05-01), Martinez
patent: 4584708 (1986-04-01), Eilers et al.
patent: 4618996 (1986-10-01), Rafal et al.
IEEE Transactions on Vehicular Communications, vol. VC-13, No. 1, 9/1964, pp. 1-18, New York, U.S.A.; T. Kawakami et al: "Waveguide Communication System for Centralized Railway Traffic Control".
Telcom Report, vol. 8, No. 3, 1985, pp. 149-151, Berlin, Germany; F. Sonntag: "Carrier Frequency Generation and Derivation for TV Transmission on 18/60 MHz Systems".
Alsthom
Griffin Robert L.
Smith Ralph
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