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Electronic vehicle toll collection system and method

DC CAFC
  • US 6,653,946 B1
  • Filed: 08/27/1998
  • Issued: 11/25/2003
  • Est. Priority Date: 05/17/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for locating and identifying a mobile transceiver comprising:

  • a plurality of stationary transmitters, each of said transmitters transmitting a radio frequency signal carrying identification information, and wherein adjacent ones of said transmitters transmit signals each of which has an antenna signal transmission pattern primary direction that is at least substantially parallel to a common direction, a mobile transceiver having a preassigned identity and including a transmitter, a receiver, and a data processor;

    said mobile transceiver identifying a closest one of said plurality of stationary transmitters and thereafter transmitting a signal which indicates the identity of the closest transmitter.

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