Train position indicator

Details Train position indicator Train position indicator

1976-03-16

1977-07-26

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

246 63R, 246122R, 343 6R, 343 65SS, 340 38L, 340 47, B61L 2500, G01S 956

Patent

active

040386538

ABSTRACT:
A low power radar mounted on the train interrogates passive transponders located along the track. Inductive coupling arrangements associated with the radar and each of the transponders inhibits responses from transponders other than the one immediately underneath the radar, and also for indicating failure of transponders.

REFERENCES:
patent: 3142836 (1964-07-01), Ambrose
patent: 3290675 (1966-12-01), Neild
patent: 3299424 (1967-01-01), Vinding
patent: 3543056 (1970-11-01), Klein
patent: 3888437 (1975-06-01), Birkin

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