METHOD AND DEVICE FOR MEASURING POSITION

摘要

The position of an object to be measured is found based on the distances from multiple transmitters arranged at prescribed intervals to a receiver attached to the object by receiving ultrasonic waves having different frequencies and transmitted intermittently and nearly synchronously from the transmitters, passing the received signals through multiple band-pass filters having different narrow-band characteristics with different center frequencies, detecting received signals from the transmitters, and then, finding the distances based on the times elapsed after the ultrasonic waves are transmitted from the transmitters until the received signals from the transmitters are detected.