This disclosure describes techniques for position location using WiFi or Bluetooth transceivers. In one implementation, the location of an object is triangulated using phased WiFi/Bluetooth arrays of narrow beamwidth and known locations. In another implementation, the digital frequency synthesis facility of WiFi or Bluetooth is leveraged to transmit a chirped radio-frequency signal to a target. The reflections of the chirp off the target, when mixed with the transmitted signal, give an estimate of target distance. Some applications of the described techniques include locating products in a supermarket, books in a library, objects in a home or office, etc.
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Zhang, Tong, "Indoor positioning using WiFi or Bluetooth chirps and phased arrays", Technical Disclosure Commons, (June 20, 2019)