G - Physics – 01 – S
Patent
G - Physics
01
S
325/16, 346/16
G01S 13/62 (2006.01) B61L 25/04 (2006.01) G06K 19/07 (2006.01) H04B 3/60 (2006.01)
Patent
CA 1060954
ABSTRACT A transponder system with ensured synchronization for a railway signalling system, comprising an interrogating station, from which an interrogation signal is transmitted continuously, and a responder station which in response to the interrogation signal repeatedly retransmits a coded information reply signal to the interrogating station, synchronization being achieved, by starting each information transmission by means of a special start signal generated in the interrogating station as a result of a special bit sequence retransmitted from the responder station. In normal operation the said bit sequence is generated immediately after the retransmission of a message or word and indicates the end of this message. At start of operation, when initially the inquiry station and reply unit have bad coupling to each other, the said special bit sequence is generated as a result of the fact that the amplitude of the interrogating signal received in the responder station exceeds a certain threshold level for starting-up the system.
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