System for identifying objects equipped with an automatic transp

Details System for identifying objects equipped with an automatic transp System for identifying objects equipped with an automatic transp

1975-12-17

1978-02-21

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 68R, G01S 956

Patent

active

040756319

ABSTRACT:
There is described a system for interrogating objects equipped with an automatic transponder in which a fixed station transmits an interrogation signal formed by at least two characteristic pulses and the transponder returns a coded response consisting of a plurality of reply pulses. The time interval between two successively transmitted characteristic pulses or pulse trains represents an item of information which determines which set of addresses is to be selected from a number of such sets stored in a memory, these addresses controlling an address input of a parallel-input, series-output multiplexing circuit which supplies a response code wherein the relative positions of the reply change from one code to the next.

REFERENCES:
patent: 3870994 (1975-03-01), McCormick et al.
patent: 3945006 (1976-03-01), Cleeton
patent: 3949397 (1976-04-01), Wagner

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