Track circuit signalling arrangement

Details Track circuit signalling arrangement Track circuit signalling arrangement

1987-07-27

1989-08-08

Crosland, Donnie L.

Communications: electrical

Vehicle detectors

2464731, 246 3, 246187R, 246 65, G08G 101, B61L 2900

Patent

active

048557374

ABSTRACT:
A digital signal is used for railway track circuit signalling. A digital signal comprises a pseudo-random binary sequence selected from a set of such sequences. The set is chosen to give the lowest possible cross-correlation between different sequences, to minimize the risk of false identification. Gold codes are suitable. One of the sequences indicates the absence of a train from the track section and this code is generated until an indication is given by a train detector that a train is present. Generation of the train absence signal is then inhibited, and other sequences are generated providing information to the train. The generated sequences are received and coded in a fail-safe decoder.

REFERENCES:
patent: 3532877 (1970-10-01), Thorn-Booth
patent: 3568149 (1971-03-01), Sibley
patent: 3718813 (1973-02-01), Williams, Jr. et al.
patent: 4314237 (1982-02-01), Darrow
patent: 4516249 (1985-05-01), Cook et al.
patent: 4582279 (1986-04-01), Pontier

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