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- W2965614023 abstract "An ultrasonic Positioning System (UPS) has outperformed RF-based systems in terms of its accuracy for years. However, few of the developed solutions have been deployed in practice to satisfy the localization demand of today's smart devices, which lack ultrasonic sensors and were considered as being `deaf' to ultrasound. A recent finding demonstrates that ultrasound may be audible to the smart devices under certain conditions due to their microphone's nonlinearity. Inspired by this insight, this work revisits the ultrasonic positioning technique and builds a practical UPS, called UPS+ for ultrasound-incapable smart devices. The core concept is to deploy two types of indoor beacon devices, which will advertise ultrasonic beacons at two different ultrasonic frequencies respectively. Their superimposed beacons are shifted to a low-frequency by virtue of the nonlinearity effect at the receiver's microphone. This underlying property functions as an implicit ultrasonic downconverter without throwing harm to the hearing system of humans. We demonstrate UPS+, a fully functional UPS prototype, with centimeter-level localization accuracy using custom-made beacon hardware and well-designed algorithms." @default.
- W2965614023 created "2019-08-13" @default.
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- W2965614023 date "2019-08-05" @default.
- W2965614023 modified "2023-10-18" @default.
- W2965614023 title "Rebooting Ultrasonic Positioning Systems for Ultrasound-incapable Smart Devices" @default.
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- W2965614023 doi "https://doi.org/10.1145/3300061.3300139" @default.
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