We have been developing an innovative relative positioning technique by using ultrasonic sensors, in order to accurately and rapidly identify distances and orientations among multiple people and electronic devices in an indoor environment.

We propose an innovative motion capture system using ultrasonic communications. Compared with existing commercial motion-capture systems that use optical or magnetic sensing, the proposed system can provide a cost effective solution for industrial and entertainment applications. To improve the capture rate of the proposed system, the EPAM algorithm was implemented in a field-programmable gate array (FPGA).