Track to train communications systems

Details Track to train communications systems Track to train communications systems

B - Operations, Transporting

61

L

346/64

B61L 3/12 (2006.01) B61L 25/04 (2006.01) G06K 7/08 (2006.01) H04B 1/59 (2006.01)

Patent

CA 1302552

ABSTRACT Track to Train Communications Systems A transponder circuit comprises a loop (4) for inductively coupling with an interrogator (2) to transmit a binary coded message to the interrogator (2). The loop (4) forms part of a tuned circuit which is tuned to a first, resonant frequency Fc and which is detunable by an associated modulator to a second, lower frequency Fc/2 whereby a binary code can be created utilising said two frequencies. Advantageously a binary '1' and a binary '0' each comprise two cycles of Fc and one cycle of Fc/2 with a binary '0' having the reverse sequence of the frequencies to a binary ' 1 ' .

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