System of communications between a post and moving bodies

Details System of communications between a post and moving bodies System of communications between a post and moving bodies

1992-01-17

1998-10-13

Rinehart, Mark H.

Communications: electrical

Continuously variable indicating

With meter reading

H04B 1400, G08G 1017

Patent

active

058218777

ABSTRACT:
Disclosed is a system of communication between a fixed post and moving bodies that may arrive simultaneously in the radius of action of this post. This system uses an exchange protocol that begins with an initializing signal (INIT) common to the different moving bodies that arrive and continues with the transmission of an identification signal by each moving body, this transmission being done at the end of a duration (T+Nt) related to the value (N) of a part of an intrinsic specific code associated with the moving body, this duration being measured from the initialization signal. Preferably, the moving body transmits the beginning of its specific code, for example the first character of this code, followed by a random word having stipulated characteristics such that the terminal can detect whether several moving bodies have transmitted the same first character simultaneously. The post then asks them to transmit a second character in order to distinguish them from one another. Personalized exchanges could then begin when all the moving bodies have been identified.

REFERENCES:
patent: 3701102 (1972-10-01), Berman et al.
patent: 3898619 (1975-08-01), Caasten et al.
patent: 4477799 (1984-10-01), Roffi et al.
patent: 4495496 (1985-01-01), Miller, III
patent: 4551710 (1985-11-01), Troupet et al.
patent: 5021777 (1991-06-01), Gross et al.
patent: 5150114 (1992-09-01), Johansson
"Automatic Vehicle Identification" AMTECH, 1988.

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