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Vehicle identification classification and communication system

  • US 5,508,705 A
  • Filed: 01/10/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 01/10/1994
  • Status: Expired due to Fees
First Claim
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1. An interrogator transponder system for electronically interrogating and communicating with multiple closely spaced vehicles including at least one interrogating device which transmits a sequence of differing address and associated message digital codes, said codes being interleaved with a sequence of identical interrogation signals, said interrogating devices being located remotely from multiple vehicles and transponder means on the vehicles for receiving the interrogator signals decoding the message codes whose associated address code is identical to the transponder identifying code and responding to the interrogation signal at a time that is precisely synchronized with the interrogation signal after a number of interrogations have been received and means in the transponders to insure that each transponder responds to a difference sequence of interrogation signals after a plurality of interrogation signals have been received.

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