US 12,292,514 B2
Ionosphere grid history and compression for GNSS positioning
Min Wang, Tustin, CA (US); Ning Luo, Cupertino, CA (US); Gengsheng Zhang, Cupertino, CA (US); and Kannan Muthuraman, Mission Viejo, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on May 15, 2023, as Appl. No. 18/317,871.
Application 18/317,871 is a continuation of application No. 17/377,255, filed on Jul. 15, 2021, granted, now 11,686,850.
Prior Publication US 2023/0288570 A1, Sep. 14, 2023
Int. Cl. G01S 19/07 (2010.01); G01S 19/40 (2010.01)
CPC G01S 19/072 (2019.08) [G01S 19/40 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method performed at a mobile device for determining ionospheric error, the method comprising:
determining, by one or more processing units of the mobile device, a positioning measurement of a Global Navigation Satellite System (GNSS) signal;
obtaining, from an augmentation system in wireless communication with the mobile device or from a memory of the mobile device, augmentation data associated with historical Total Electron Content (TEC) values, wherein the augmentation data was generated to represent ionospheric delay during a time period that ended before the augmentation data is obtained;
extrapolating, using the augmentation data, a value indicative of an ionospheric delay in the GNSS signal as observed by the mobile device;
obtaining a pierce point of the GNSS signal; and
determining, by the one or more processing units, an ionospheric error in the positioning measurement of the GNSS signal based on the pierce point and the value indicative of the ionospheric delay in the GNSS signal.