US 11,860,283 B2
Detecting the spoofing of a signal
Stefan Alexander Schwindt, Cheltenham (GB)
Assigned to GE Aviation Systems Limited, Cheltenham (GB)
Filed by GE Aviation Systems Limited, Cheltenham (GB)
Filed on Sep. 16, 2022, as Appl. No. 17/946,625.
Application 17/946,625 is a continuation of application No. 16/681,318, filed on Nov. 12, 2019, granted, now 11,480,689.
Claims priority of application No. 1818570 (GB), filed on Nov. 14, 2018.
Prior Publication US 2023/0016669 A1, Jan. 19, 2023
Int. Cl. G01S 19/21 (2010.01); G01S 19/24 (2010.01); G01S 19/29 (2010.01)
CPC G01S 19/215 (2013.01) [G01S 19/21 (2013.01); G01S 19/246 (2013.01); G01S 19/29 (2013.01)] 20 Claims
OG exemplary drawing
 
14. An apparatus for detecting the spoofing of a signal from a satellite in orbit to an aircraft, the apparatus comprising:
a receiver located on the aircraft configured to receive an apparent satellite signal and capable of compensating for weather conditions;
a database configured to store data values including an expected power level and an expected waveform;
a computer configured to:
determine at least two characteristic signatures of the apparent satellite signal including a power level of the received apparent satellite signal and a waveform generated by hardware or software of a source of the apparent satellite signal;
compare the power level with the expected power level of a signal received from a satellite in orbit to define a first difference value;
compare the waveform with the expected waveform of the signal received from the satellite in orbit to define a second difference value; and
indicate that the apparent satellite signal is a spoofed satellite signal when at least one of the first or second difference value is outside a predetermined tolerance value.