Electronic vehicle toll collection system and method

  • US 20030067396A1
  • Filed: 08/15/2002
  • Published: 04/10/2003
  • Est. Priority Date: 05/17/1990
  • Status: Active Grant
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First Claim
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16. An apparatus for locating and identifying a mobile transceiver comprising:

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