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Ultrasonic occupant detection and classification system

  • US 6,932,769 B2
  • Filed: 05/28/2003
  • Issued: 08/23/2005
  • Est. Priority Date: 05/28/2003
  • Status: Expired due to Term
First Claim
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1. A method for classifying an occupant in a predetermined volume comprising:

  • transmitting an ultrasonic signal having a predetermined transmitter amplitude and a predetermined ultrasonic frequency through the predetermined volume;

    receiving a composite ultrasonic signal comprising a signal component produced by interference between the transmitted ultrasonic signal and a returning reflection of the transmitted ultrasonic signal from an occupant within the predetermined volume;

    amplitude demodulating the composite ultrasonic signal to isolate the signal component;

    analyzing the signal component to derive frequency data therefrom; and

    classifying the occupant within the predetermined volume from the derived frequency data of the interference signal component.

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