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Combined motion detector/transmitter for a traffic information warning system

  • US 5,612,685 A
  • Filed: 03/20/1996
  • Issued: 03/18/1997
  • Est. Priority Date: 03/20/1996
  • Status: Expired due to Term
First Claim
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1. A combined motion detector/transmitter for a traffic information warning system for conveying a message regarding a traffic situation comprising:

  • a first oscillator for transmitting a first unmodulated carrier signal and for setting up a first disturbance field, the first unmodulated carrier signal having a first carrier signal frequency;

    a second oscillator for transmitting a second unmodulated carrier signal and setting up a second disturbance field, the second unmodulated carrier signal having a second carrier signal frequency, wherein the difference in magnitude between the first carrier signal frequency and the second carrier signal frequency specifies the message regarding the traffic situation;

    a first reflected signal receiver associated with the first oscillator for receiving a first reflected signal when a target is within the first disturbance field;

    a second reflected signal receiver associated with the second oscillator for receiving a second reflected signal when a target is within the second disturbance field;

    a first detector circuit for detecting the presence or absence of a moving target in the first disturbance field;

    a second detector circuit for detecting the presence or absence of a moving target in the second disturbance field; and

    ,an indicator for indicating the detected presence of a moving target in either the first or second disturbance field.

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