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Method and system for location estimation

  • US 9,510,319 B2
  • Filed: 12/10/2014
  • Issued: 11/29/2016
  • Est. Priority Date: 12/10/2014
  • Status: Active Grant
First Claim
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1. A location estimation method comprising:

  • (a) performing a primary wireless scan to identify a first set of access points at a user location, the user location associated with a first user location estimate;

    (b) performing a secondary wireless scan at pre-defined time intervals subsequent to the primary wireless scan, a set of access points is identified corresponding to each secondary wireless scan, and for each secondary wireless scan, a number of shared access points is identified and compared with a pre-defined threshold value, a shared access point being an access point identified to be present in the first set of access points and the set of access points corresponding to the secondary wireless scan;

    (c) detecting with a location estimation device;

    a presence of user motion if the number of shared access points is less than or equal to the pre-defined threshold value for a pre-defined number of consecutive secondary wireless scans, oran absence of the user motion from the user location if the number of shared access points is greater than the pre-defined threshold value for the pre-defined number of consecutive secondary wireless scans;

    (d) estimating a current user location with the location estimation device, based on;

    the first user location estimate if the absence of the user motion is detected, ora second user location estimate computed based on geolocation signals if the presence of the user motion is detected;

    (e) detecting, with the location estimation device, if a difference between the second user location estimate and the first user location estimate is greater than a pre-defined distance threshold; and

    (f) detecting subsequent user motion, with the location estimation device, based on;

    Wi-Fi signals if the difference between the second user location estimate and the first user location estimate is less than or equal to the pre-defined distance threshold, orgeolocation signals if the difference between the second user location estimate and the first user location estimate is greater than the pre-defined distance threshold.

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