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Position measurement device

  • US 9,494,684 B2
  • Filed: 06/10/2014
  • Issued: 11/15/2016
  • Est. Priority Date: 12/12/2011
  • Status: Active Grant
First Claim
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1. A position measurement device for measuring a position of an object using ultrasound, the device comprising:

  • a transmitter configured to emit an ultrasonic wave;

    at least three receivers each configured to receive a received ultrasonic wave;

    a time determination unit configured to determine respective arrival time candidates for each receiver based on the received wave received by each receiver, wherein the respective arrival time candidates are time periods from emission of the ultrasonic wave to reception of the received ultrasonic wave;

    a coordinate calculation unit configured to calculate a plurality of candidates of three-dimensional coordinates indicative of positions of the object based on the arrival time candidates; and

    a coordinate determination unit configured to determine three-dimensional coordinates of the object based on the plurality of candidates of three-dimensional coordinates.

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