Method and device for detecting satellite signal spoofing

A device comprising:

• an antenna system configured to perform spatial filtering causing an attenuation of power of radio signals received by the antenna system in an angular sector, the spatial filtering being adapted so that the attenuation does not interrupt the tracking, by a GNSS receiver coupled to the antenna system, of a radio signal received by the antenna system in any direction,
• a detector configured to:
• detect that the following conditions are met:
• a radio signal is received by the antenna system while the angular sector includes a direction pointing towards a satellite forming part of a constellation of positioning satellites, the received radio signal is not subject to the attenuation caused by the spatial filtering, and the received radio signal appears as a positioning signal emanating from the satellite, and
• upon detecting that the conditions are met, implement a processing under the assumption that the antenna system has been spoofed.