US 12,436,294 B2
Detecting spoofed global navigation satellite system (GNSS) signals
Han Zhang, Beijing (CN); Ning Luo, Cupertino, CA (US); Gengsheng Zhang, Cupertino, CA (US); Bo Zheng, Sunnyvale, CA (US); Yinghua Yang, San Jose, CA (US); and Min Wang, Tustin, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Dec. 8, 2023, as Appl. No. 18/534,354.
Application 18/534,354 is a division of application No. 17/238,730, filed on Apr. 23, 2021, granted, now 11,892,545.
Prior Publication US 2024/0111061 A1, Apr. 4, 2024
Int. Cl. G01S 19/21 (2010.01)
CPC G01S 19/215 (2013.01) 15 Claims
OG exemplary drawing
 
1. A method performed by a user equipment, comprising:
receiving a Global Navigation Satellite System (GNSS) signal from a satellite;
receiving a spoofing alert message comprising an indication that a spoofed GNSS condition associated with the GNSS signal is present, a location of a spoofer broadcasting a spoofed GNSS signal, and an indication of a spoofed zone, wherein the spoofing alert message is based on GNSS measurement data obtained by a set of one or more monitored devices comprising:
a short-term average of a first plurality of GNSS fixes determined by the set of one or more monitored devices;
a long-term average of a second plurality of GNSS fixes determined by the set of one or more monitored devices;
a difference between the short-term average and the long-term average; and
a horizontal estimated position error determined by the set of one or more monitored devices;
determining that the spoofing alert message indicates that a spoofed GNSS condition is present;
determining, based on the spoofing alert message, a location of a spoofer broadcasting a spoofed GNSS signal;
determining, based on the location of the spoofer and a current location of the user equipment, that the user equipment is within a receiving area of the spoofed GNSS signal; and
determining an updated current location of the user equipment based on the GNSS signal received from the satellite without using the spoofed GNSS signal.