Method and device for increasing the security against transmissi

Details Method and device for increasing the security against transmissi Method and device for increasing the security against transmissi

1977-03-11

1979-02-06

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 65LC, G01S 956

Patent

active

041386760

ABSTRACT:
A method and device for increasing security with respect to transmission faults in an information-transmission system, particularly for the railroad field, in which an interrogation device and a passive response device are movable relative to one another, and the interrogation device transmits an interrogation signal, which can be periodically swept through a predetermined frequency band, preferably in the microwave range, and which during a read operation, receives during several periods from the passive response device, a frequency-selectively reflected interrogation signal, in accordance with a k-digit information item to be transmitted, which signal forms the response signal, with the response signals being suitably identified and one of a series thereof, preferably that with the least errors therein, being suitably through-connected for subsequent utilization, in which not only is the response signal with the fewest errors utilized, but of the signals having the same minimum number of errors, that response signal which had the highest input signal strength at the time of receipt of the interrogation device.

REFERENCES:
patent: 3863244 (1975-01-01), Lichtblau
patent: 3969725 (1976-07-01), Couvillon et al.
patent: 4037227 (1977-07-01), Kline

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