December 03, 2019

Smartphone Positioning with Radio Measurements Performed by a Single WiFi Access Point

  • Abrudan T.
  • Claussen H.
  • Domenico Giustiniano
  • Giustiniano D.
  • Kolmonen V.
  • Maurizio Rea
  • Rea M.

Despite the large literature on localization, there is no solution yet to localize a commercial off-the-shelf smartphone device using radio measurements performed by a single WiFi AP. We present a single AP localization system that exploits Fine Time Measurements (FTM) and Angle of Arrival (AOA) extracted from commercial chipsets exploiting the specifications of the recent 802.11-2016 and the 802.11ac amendment to combine the distance and the direction from the AP to the client for positioning. Such a system has the potential to bring indoor positioning to homes and small businesses which typically have a single access point. We exploit physical layer (PHY) information to detect the number of paths and their directions.We use this information to derive a new method for filtering the ranging measurements obtained from a FTM platform. We achieve sub-meter distance estimation accuracy eliminating the adverse effect of multipath in FTM using input information from AOA. The evaluation in indoor scenarios in multipath rich environments demonstrates that the combination of AOA estimation and the proposed FTM refinement approach can locate a Google Pixel 3 smartphone with a median 2-D positioning error between 0.9 and 2.15 m through an area comparable to typical flat sizes.

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