US 12,143,890 B2
Precise indoor localization and tracking of electronic devices
Amit S. Sant, Santa Clara, CA (US); Alejandro J. Marquez, Sunnyvale, CA (US); Indranil S. Sen, Cupertino, CA (US); Mohit Narang, Cupertino, CA (US); and Shang-Te Yang, Sunnyvale, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Mar. 6, 2023, as Appl. No. 18/117,877.
Application 16/511,756 is a division of application No. 15/619,171, filed on Jun. 9, 2017, granted, now 10,356,553, issued on Jul. 16, 2019.
Application 18/117,877 is a continuation of application No. 17/340,919, filed on Jun. 7, 2021, granted, now 11,601,779.
Application 17/340,919 is a continuation of application No. 16/511,756, filed on Jul. 15, 2019, granted, now 11,032,668, issued on Jun. 8, 2021.
Claims priority of provisional application 62/399,145, filed on Sep. 23, 2016.
Prior Publication US 2023/0217213 A1, Jul. 6, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 4/02 (2018.01); G01S 5/00 (2006.01); G01S 5/12 (2006.01); G01S 5/14 (2006.01); H04B 17/11 (2015.01); H04B 17/21 (2015.01); H04W 4/024 (2018.01); H04W 4/029 (2018.01); H04W 4/33 (2018.01); H04W 64/00 (2009.01); H04W 88/02 (2009.01)
CPC H04W 4/023 (2013.01) [G01S 5/017 (2020.05); G01S 5/12 (2013.01); G01S 5/14 (2013.01); H04B 17/11 (2015.01); H04B 17/21 (2015.01); H04W 4/026 (2013.01); H04W 4/029 (2018.02); H04W 64/00 (2013.01); H04W 64/003 (2013.01); H04W 4/024 (2018.02); H04W 4/33 (2018.02); H04W 88/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
generating, with respect to a reference node, a radio frequency (RF) map indicating one or more wireless electronic devices, based upon radio frequency signals arriving at the reference node from the one or more wireless electronic devices;
determining a distance variation characteristic associated with the radio frequency signals with respect to the reference node;
determining a location ambiguity associated with the distance variation characteristic;
reshaping the RF map to compensate for the location ambiguity; and
generating, on the reshaped RF map, an indication of a physical location of each of the one or more wireless electronic devices.