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Vehicle occupant detection system and method using radar motion sensor

  • US 6,753,780 B2
  • Filed: 03/15/2002
  • Issued: 06/22/2004
  • Est. Priority Date: 03/15/2002
  • Status: Expired due to Term
First Claim
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1. A motion detection system for detecting the presence of an occupant in a vehicle, said detection system comprising:

  • a radar motion sensor located in a compartment of a vehicle, said radar sensor transmitting and receiving radar signals within the compartment and generating sensed signals; and

    a controller converting the sensed signals to a frequency domain, said controller further processing the frequency domain of sensed signals within a frequency range and determining the presence of movement of an occupant due to one of heartbeat and breathing, wherein said controller compares the frequency domain of sensed signals within the frequency range to a predetermined frequency characteristic, and further identifies a frequency of the sensed signals indicative of movement of an occupant due to one of heartbeat and breathing.

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