US 12,082,140 B2
Localization, synchronization and navigation using passive sensor networks
Oren Jean, Ness Ziona (IL); and Anthony Joseph Weiss, Tel-Aviv (IL)
Assigned to SULU Networks Ltd., Ness Ziona (IL)
Filed by SULU Networks Ltd., Ness Ziona (IL)
Filed on Oct. 4, 2021, as Appl. No. 17/492,773.
Application 17/492,773 is a continuation of application No. 14/388,808, granted, now 11,140,645, previously published as PCT/IB2013/052020, filed on Mar. 14, 2013.
Claims priority of provisional application 61/755,485, filed on Jan. 23, 2013.
Claims priority of provisional application 61/617,186, filed on Mar. 29, 2012.
Prior Publication US 2022/0039036 A1, Feb. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 56/00 (2009.01); G01S 5/02 (2010.01); G01S 5/06 (2006.01); G01S 5/10 (2006.01); G01S 19/21 (2010.01); G04G 7/00 (2006.01); H04L 67/12 (2022.01); H04W 64/00 (2009.01)
CPC H04W 56/002 (2013.01) [G01S 5/021 (2013.01); G01S 5/02216 (2020.05); G01S 5/0226 (2013.01); G01S 5/0289 (2013.01); G01S 5/06 (2013.01); G01S 5/10 (2013.01); G01S 19/215 (2013.01); H04L 67/12 (2013.01); H04W 56/00 (2013.01); H04W 64/00 (2013.01); G04G 7/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for transmitter operation, comprising:
receiving recorded time of arrival (TOA) measurements of transmitted signals from a plurality of sensors, at unknown locations, the signals being transmitted from at least a group of sources in a network of sources, which are each synchronized by a respective external synchronization source, and which are configured to transmit the signals at times determined according to the respective clocks, wherein the sensors do not serve as sources of the transmitted signals;
obtaining location information comprising respective source locations of the sources;
calculating synchronization values for the sources comprising at least one of respective offsets and skews of the clocks thereof as a function of the location information comprising the respective source locations, and the received recorded TOA measurements from the sensors, without dependence on measurements of transmissions emitted by the sensors to the sources;
monitoring said synchronization values; and
outputting said synchronization values to at least one of a User Interface (UI) and a communication interface;
providing at least one backup clock based on said synchronization values for an existing system.