Vehicle position indicator with radar interrogation each of spac

Details Vehicle position indicator with radar interrogation each of spac Vehicle position indicator with radar interrogation each of spac

1975-09-30

1977-06-07

Kunin, Stephen G.

Railway switches and signals

Train-position indication

Miniature model

340 23, 340 47, 340408, 343 65R, 343 68R, G01S 956

Patent

active

040278409

ABSTRACT:
This invention applies to an automatic train control system. A low power radar mounted beneath a train interrogates simple passive transponders mounted between the rails. Each transponder includes a reflective delay line. The radar has a number of range gates. The transponder delays are arranged in a simple code which provides information as to the location of the train along the track. The outputs of the range gates can be fed to a simple computer which can also receive wheel revolution pulses from an axle mounted transducer. The computer can then calculate the distance travelled at any given moment to within one meter from the last transponder over which the train has passed.

REFERENCES:
patent: 3184737 (1965-05-01), Child
patent: 3685050 (1972-08-01), Cartwright
patent: 3706094 (1972-12-01), Cole et al.
patent: 3780370 (1973-12-01), Reeves
patent: 3888437 (1975-06-01), Birkin
patent: 3919708 (1975-11-01), Pudsey
Automatic Systems of Wagon Identification, The Railway Gazette, June 18, 1965, pp. 489-497.

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