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You're talking about a GPS repeater. Such systems are commercially available to rebroadcast a GPS signal within a building where the signal wouldn't penetrate,
by GrumpyYoungMan 9y ago
You're talking about a GPS repeater. Such systems are commercially available to rebroadcast a GPS signal within a building where the signal wouldn't penetrate, but require a license to operate, IIRC.
As for countermeasures, well, whoever's holding the receiver is bound to get suspicious if they move and the reported position doesn't. :) Jokes aside, there is work being done integrating other sensors (inertial, compass, gyro, etc.) to do dead reckoning to detect errors in the position and motion reported by the GNSS receiver.
As an aside, "GPS" technically refers only to the positioning system operated by the United States. The generic term is "GNSS" (global navigation satellite system) and encompasses GPS, GLONASS, Galileo, Beidou, etc.)
- Nokinside 9y ago> there is work being done integrating other sensors Integrated navigation systems GPS/INS are already default in many critical civilian systems. They sell these systems as a single package. These systems are still vulnerable against satellite-lock takeover where the spoofer who starts with repeating the correct signal and diverges from it gradually.