Communications: electrical – Vehicle position indication – At remote location
Patent
1981-10-21
1984-09-11
Groody, James J.
Communications: electrical
Vehicle position indication
At remote location
246122R, 246 63R, 340 21, 34082554, G08G 112, B66B 302, B61L 2500
Patent
active
044713568
ABSTRACT:
A stationary transmitting and receiving station includes a transmitting section which is connected to an elongated induction loop and operable to transmit signal messages including identifying code signals to said induction loop, and a receiving section adapted to receive acknowledgements. A plurality of mobile units are movable along said induction loop and comprise each a receiver inductively coupled to said induction loop and adapted to receive from said induction loop signal messages which include a code signal identifying said mobile unit, and a transmitter operable to transmit an acknowledgment in response to the reception of such signal message by said receiver. A plurality of acknowledgment loops extend along respective length portions of said induction loop and are inductively coupled to said transmitters of all said movable units. Said receiving section comprises a plurality of receiving units, each of which is connected to one of said acknowledgment loops and adapted to receive said acknowledgment therefrom.
REFERENCES:
patent: 2753550 (1956-07-01), Treharne
patent: 3740549 (1973-06-01), Thorne-Booth
patent: 3771119 (1973-11-01), Evans
Groody James J.
Kelman Kurt
Voest-Alpine Aktiengesellschaft
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