POSITION MEASUREMENT DEVICE

摘要

A position measurement device that measures three-dimensional coordinates of an object using ultrasound. The position measurement device includes a transmitter that emits an ultrasonic wave; three receivers that receive an ultrasonic wave; a time determination unit that determines an arrival time candidate for each of the receivers wherein the arrival time candidate is a time period from emission to arrival of the ultrasonic wave after being reflected from an object, and determines a plurality of the arrival time candidates for at least one of the receivers; a coordinate calculation unit that calculates a plurality of candidates of three-dimensional coordinates indicative of positions of the object based on the arrival time candidates determined by the time determination unit and relative positions of the transmitter and the receivers; and a coordinate determination unit that determines the three-dimensional coordinates of the object based on the plurality of candidates of three-dimensional coordinates.

主权项

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.