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Method and apparatus for ultrasonic sensing

  • US 7,911,881 B2
  • Filed: 02/05/2008
  • Issued: 03/22/2011
  • Est. Priority Date: 04/20/2007
  • Status: Active Grant
First Claim
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1. A range sensing apparatus for determining a distance from the range sensing apparatus to a surface comprising:

  • a first ultrasonic range sensor having a first size;

    a second ultrasonic range sensor having a second size different from the first size; and

    a controller configured to calculate the distance based at least in part on ranges measured with the first and second ultrasonic range sensors.

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