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Intelligent vehicle highway system sensor and method

  • US 5,896,190 A
  • Filed: 10/09/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 11/23/1992
  • Status: Expired due to Term
First Claim
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1. A sensor for roadway vehicle detection and classification, the sensor comprising:

  • laser emitting means positioned above a roadway for emitting a continuous sequence of infrared coherent radiation pulses forming a laser beam directed toward the roadway;

    laser receiving means operable with the laser emitting means for receiving a portion of coherent returning radiation pulses reflected from one of the roadway and vehicles on the roadway, the laser receiving means initiating a time dependent signal in response to receiving a portion of the one coherent radiation pulse returning after being reflected from one of the roadway and a vehicle on the roadway; and

    processing means communicating with the laser emitting means and laser receiving means for indicating a vehicle presence on the roadway and for providing a vehicle classification, the processing means providing timing corrections for signal variations in the time dependent signal.

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