![]() Localization accuracy using custom-made beacon hardware and well-designed Weĭemonstrate UPS+, a fully functional UPS prototype, with centimeter-level This underlying property functions as an implicit ultrasonicĭownconverter without throwing harm to the hearing system of humans. Low-frequency by virtue of the nonlinearity effect at the receiver's Their superimposed beacons are shifted to a ![]() The core concept is to deploy two types of indoor beaconĭevices, which will advertise ultrasonic beacons at two different ultrasonicįrequencies respectively. Technique and builds a practical UPS, called UPS+ for ultrasound-incapable Inspired by this insight, this work revisits the ultrasonic positioning Smart devices under certain conditions due to their microphone's nonlinearity. A recent finding demonstrates that ultrasound may be audible to the However, few of the developed solutions haveīeen deployed in practice to satisfy the localization demand of today's smartĭevices, which lack ultrasonic sensors and were considered as being `deaf' to An ultrasonic Positioning System (UPS) has outperformed RF-based systems in
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