US 11,835,639 B2
Partially synchronized multilateration or trilateration method and system for positional finding using RF
Felix Markhovsky, Dallas, TX (US); Truman Prevatt, Dallas, TX (US); and Russ Markhovsky, Dallas, TX (US)
Assigned to QUALCOMM Technologies, Inc., San Diego, CA (US)
Filed by QUALCOMM TECHNOLOGIES, INC., San Diego, CA (US)
Filed on May 15, 2017, as Appl. No. 15/595,702.
Application 15/595,702 is a division of application No. 15/501,169, granted, now 10,281,557, previously published as PCT/US2015/043321, filed on Jul. 31, 2015.
Application 15/501,169 is a continuation in part of application No. 13/566,993, filed on Aug. 3, 2012, granted, now 9,507,007, issued on Nov. 29, 2016.
Claims priority of provisional application 62/032,371, filed on Aug. 1, 2014.
Claims priority of provisional application 61/662,270, filed on Jun. 20, 2012.
Claims priority of provisional application 61/618,472, filed on Mar. 30, 2012.
Claims priority of provisional application 61/554,945, filed on Nov. 2, 2011.
Claims priority of provisional application 61/514,839, filed on Aug. 3, 2011.
Prior Publication US 2017/0248678 A1, Aug. 31, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 5/02 (2010.01); H04W 4/02 (2018.01); H04W 56/00 (2009.01); G01S 1/04 (2006.01); G01S 1/20 (2006.01); G01S 3/74 (2006.01); G01S 13/74 (2006.01)
CPC G01S 5/0218 (2020.05) [G01S 1/0423 (2019.08); G01S 1/20 (2013.01); G01S 3/74 (2013.01); G01S 5/021 (2013.01); G01S 5/0205 (2013.01); G01S 5/0215 (2013.01); G01S 5/0226 (2013.01); G01S 5/0257 (2013.01); G01S 13/74 (2013.01); H04W 4/023 (2013.01); H04W 56/001 (2013.01); G01S 5/0252 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for determining a location of one or more mobile communication devices in a wireless system, the method comprising:
receiving reference signals from a mobile communication device among a plurality of geographically distributed mobile communication devices via two or more co-located separate and physical signal processing receiver channels contained in a stationary location management unit, wherein the two or more co-located signal processing receiver channels are time synchronized with each other by an external synchronization source producing a time synchronization signal received by the two or more co-located signal processing receiver channels, and wherein the location of the location management unit is known in advance; and
utilizing, by the stationary location management unit, one or more measurements determined based on the received reference signals to calculate a location of at least the mobile communication device among the plurality of geographically distributed mobile communication devices.