Terminal diversity for off-board railway communications

Details Terminal diversity for off-board railway communications Terminal diversity for off-board railway communications

2005-04-26

2005-04-26

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S278100, C455S101000, C455S277200

Reexamination Certificate

active

06885854

ABSTRACT:
An off-board communications system (50) for railway communications to and from a locomotive (10) and a central station (18). A radio (56) utilizes multiple antennas (52, 54) to broadcast a transmission signal (62, 64) over parallel communications paths so to insure that a data sent from a locomotive (10) is complete. In one embodiment, the antennas (52, 54) are selected to broadcast signals as a function of signal magnitude and phase weighting so to optimize transmissions directed at a remotely located receiver (42). In another embodiment, antennas (92, 94) broadcast at different frequencies, and with different modulation and broadcast protocols. A signal divider (74) such as a multiplexer divides the signal prior to transmission, and a signal recombining unit (84) recombines transmitted signals (80, 82) at the receiving site. A performance/availability checker is employed to monitor transmission integrity.

REFERENCES:
patent: 5420883 (1995-05-01), Swensen et al.
patent: 5548835 (1996-08-01), Sasaki
patent: 5867801 (1999-02-01), Denny
patent: 5913177 (1999-06-01), Meredith et al.
patent: 5953659 (1999-09-01), Kotzin et al.
patent: 6091372 (2000-07-01), Dienes
patent: 6807401 (2004-10-01), Boyle
patent: 20030092402 (2003-05-01), Shapira et al.

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