US 11,683,779 B2
Systems and methods for precise radio frequency localization in the presence of multiple communication paths
Manu Seth, Berkeley, CA (US); Lingkai Kong, Palo Alto, CA (US); Tommi Ylamurto, Los Gatos, CA (US); and Vivek Subramanian, Lausanne (CH)
Assigned to ZaiNar, Inc., Redwood City, CA (US)
Filed by ZaiNar, Inc., Redwood City, CA (US)
Filed on Jun. 5, 2020, as Appl. No. 16/894,023.
Application 16/894,023 is a division of application No. 15/173,531, filed on Jun. 3, 2016, granted, now 10,757,675.
Prior Publication US 2020/0305113 A1, Sep. 24, 2020
Int. Cl. H04W 64/00 (2009.01); H04L 43/0864 (2022.01); H04L 47/283 (2022.01); H04L 41/12 (2022.01); G01S 5/02 (2010.01); H04W 28/02 (2009.01); H04L 45/122 (2022.01); H04L 45/121 (2022.01)
CPC H04W 64/003 (2013.01) [G01S 5/0218 (2020.05); G01S 5/0268 (2013.01); G01S 5/0289 (2013.01); H04L 41/12 (2013.01); H04L 43/0864 (2013.01); H04L 45/121 (2013.01); H04L 45/122 (2013.01); H04L 47/283 (2013.01); H04W 28/0236 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a memory for storing instructions;
a set of processing units to execute instructions for controlling a plurality of sensor nodes in a wireless network architecture and determining locations of the plurality of sensor nodes; and
a radio frequency ( ) circuitry to transmit communications to and receive communications from the plurality of sensor nodes each having a wireless device with a transmitter and a receiver to enable bi-directional communications with the radio frequency circuitry of the apparatus in the wireless network architecture, wherein the set of processing units of the apparatus are configured to execute instructions to:
calibrate an automatic gain control stage of the radio frequency circuitry by measuring a delay of the automatic gain control stage as a function of gain; and
determine a time of flight estimate for communications between the apparatus and a sensor node based on the calibration of the automatic gain control stage.