Abstract
This paper describes a work on 3D positioning system for mobile devices such as cellular phones and IoT devices with built-in microphones. The uniqueness of the described system is its ability to provide simultaneous and accurate positioning of multiple devices, based on signals transmitted by stationary beacons, while the devices are sampling the signals by their internal, unsynchronized clocks. Auxiliary information required for synchronization is collected and broadcasted by a monitor unit through an modem. The system is considered to be pure play ultrasonic since no wiring or radio transmission is used. The number of devices positioned simultaneously is practically unlimited since they do not emit any energy, and their position calculation is performed locally. In the demonstrated system the positioned devices were cellular phones, operating at a sampling rate of 44,100 samples per second. This sampling rate enables using signals beyond the human hearing range.
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