Patent ID: 9439041
Filing Date: 2016-09-06
CPC Classification: H04W

Claim Text:
1. A method of determining a location of a user within an indoor environment, the method comprising: for each radio frequency (RF) source of a plurality of RF sources: (i) receiving RF signal data from the RF source, and (ii) computing a yield of the RF source based on the received data comprising computing a frequency of the received RF data over at least one of a period of time or a number of observations; selecting a subset of fingerprints from a database of fingerprints, based on, at least in part, the yield associated with each of the plurality of RF sources; receiving tracking data from an inertial navigation system; and determining a location of a user based on, at least in part: (i) the RF signal data received from each of the RF sources in the subset, and (ii) the received tracking data.