US 12,066,561 B2
Position tracking system and method using radio signals and inertial sensing
Edward L. Hill, Conway, NH (US); and Mark Schneider, Williston, VT (US)
Assigned to Position Imaging, Inc., Portsmouth, NH (US)
Filed by Position Imaging, Inc., Portsmouth, NH (US)
Filed on Oct. 25, 2021, as Appl. No. 17/509,392.
Application 17/509,392 is a continuation of application No. 16/571,622, filed on Sep. 16, 2019, granted, now 11,175,375.
Application 16/571,622 is a continuation in part of application No. 15/685,493, filed on Aug. 24, 2017, granted, now 10,416,276, issued on Sep. 17, 2019.
Application 15/685,493 is a continuation in part of application No. 14/600,025, filed on Jan. 20, 2015, abandoned.
Application 14/600,025 is a continuation of application No. 13/293,639, filed on Nov. 10, 2011, granted, now 8,957,812, issued on Feb. 17, 2015.
Claims priority of provisional application 61/413,026, filed on Nov. 12, 2010.
Prior Publication US 2022/0043102 A1, Feb. 10, 2022
Int. Cl. G01S 5/02 (2010.01)
CPC G01S 5/0263 (2013.01) [G01S 5/0264 (2020.05); G01S 5/0257 (2013.01); G01S 5/02585 (2020.05); G01S 5/0294 (2013.01)] 18 Claims
OG exemplary drawing
 
16. A system for tracking a position of a mobile device, the system comprising:
a sensor attached to the mobile device, the sensor configured to determine position and orientation information of the mobile device by monitoring inertia over time;
a radiofrequency (RF) tracking system comprising:
at least one RF transmitter antenna on the mobile device,
at least one RF receiver antenna; and
at least one processor in communication with the sensor and the at least one receiver antenna, the at least one processor being configured to:
calculate position information of the mobile device based on the RF signals received by the at least one RF receiver antenna to track the mobile device;
compare the position information of the RF signals and the inertial measurement data to modify a position stability of the RF signals; and
supplementing the tracking of the mobile device by combining
the calculated position information with the inertial measurement data measured by the sensor; and
reduce power to the at least one RF antenna when motion of the mobile device is not detected for a predetermined period.