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SYSTEM AND METHOD FOR ESTIMATING DISTANCE BETWEEN A MOBILE UNIT AND A VEHICLE USING A TOF SYSTEM

  • US 20160077200A1
  • Filed: 11/20/2015
  • Published: 03/17/2016
  • Est. Priority Date: 04/12/2011
  • Status: Active Application
First Claim
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1. A method of estimating distance between a mobile unit and a vehicle, said method comprising:

  • providing a time of flight subsystem including circuitry incorporated in the mobile unit and circuitry incorporated in the vehicle;

    generating a time of flight distance signal by periodically transmitting a time of flight signal between the mobile unit and the vehicle and measuring the time taken for transmission of the time of flight signal between the mobile unit and the vehicle;

    disposing a travel sensor at the mobile unit;

    generating a travel sensor signal using the travel sensor;

    initializing a value of a distance estimate signal based on the time of flight distance signal;

    determining movement of the mobile unit based on variance in the travel sensor signal; and

    changing the initialized value of the initialized distance estimate signal based upon determination of movement of the mobile unit, wherein the value of the initialized distance estimate signal is increased responsive to the time of flight distance signal being greater than the initialized distance estimate signal, and wherein the value of the initialized distance estimate signal is decreased responsive to the time of flight distance signal being less than the initialized distance estimate signal.

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