System for targeted braking of vehicles

Details System for targeted braking of vehicles System for targeted braking of vehicles

1994-03-08

1995-07-25

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

342 71, 246182R, 246182C, B61L 302

Patent

active

054366313

ABSTRACT:
A system for identifying momentary location and the momentary velocity of, in particular, a rail-bound vehicle, has a transmission/evaluation unit having an antenna for emitting a high-frequency pulse and for receiving a reflected pulse reply signal. Surface wave identification marks having individual coding are arranged at intervals from one another in an area of and along a prescribed travel path of the vehicle. The mutual phase shift of at least two pulse reply signals can be measured as a Doppler shift and the travel velocity can be calculated therefrom via the relative velocity with pulse interrogations of an identification mark following one another at least twice at a predetermined location before/after traversing a specific identification mark. The point in time change in operational sign of the Doppler shift is acquired for this identification mark, and is the point in time of traversal of the location of the specific identification mark.

REFERENCES:
patent: 4027840 (1977-06-01), Blair
patent: 4096477 (1978-06-01), Epstein et al.
patent: 4983984 (1991-01-01), Shibano et al.
patent: 5294081 (1994-03-01), Malon

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