EP 0274650 B1 19930210 - BIDIRECTIONNEL INFORMATION TRANSMISSION SYSTEM BETWEEN A MONITOR STATION ON THE GROUND AND A MOBILE STATION
Title (en)
BIDIRECTIONNEL INFORMATION TRANSMISSION SYSTEM BETWEEN A MONITOR STATION ON THE GROUND AND A MOBILE STATION
Publication
Application
Priority
FR 8617137 A 19861208
Abstract (en)
[origin: US4910793A] 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.
IPC 1-7
IPC 8 full level
H04B 7/26 (2006.01); B61L 3/12 (2006.01); B61L 3/22 (2006.01); B61L 3/24 (2006.01); B61L 23/22 (2006.01); H01Q 1/32 (2006.01); H04B 5/00 (2006.01); H04B 7/00 (2006.01)
CPC (source: EP US)
B61L 3/227 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
US 4910793 A 19900320; AT E85565 T1 19930215; CA 1272762 A 19900814; DE 3784155 D1 19930325; DE 3784155 T2 19930527; EP 0274650 A1 19880720; EP 0274650 B1 19930210; ES 2038649 T3 19930801; FR 2607769 A1 19880610; FR 2607769 B1 19890203; JP H0817343 B2 19960221; JP S63160432 A 19880704
DOCDB simple family (application)
US 13012287 A 19871208; AT 87117888 T 19871203; CA 553676 A 19871207; DE 3784155 T 19871203; EP 87117888 A 19871203; ES 87117888 T 19871203; FR 8617137 A 19861208; JP 31078987 A 19871208