| 摘要 |
Provide a position measurement device that measures three-dimensional coordinates of an object using ultrasound and has improved measurement accuracy by reducing noise effects. A position measurement device (1) includes a transmitter (10) that emits an ultrasonic wave; three receivers (11 to 13) that receive an ultrasonic wave; a time determination unit (43) that determines an arrival time candidate for each of the receivers (11 to 13) 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 (11 to 13); a coordinate calculation unit (44) 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 (43) and relative positions of the transmitter (10) and the receivers (11 to 13); and a coordinate determination unit (45) that determines the three-dimensional coordinates of the object based on the plurality of candidates of three-dimensional coordinates. |
