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In order to combat the spoofing of global navigation satellite system (GNSS) signals, we propose a novel signal authentication method based on information-theoretic security. In particular, the satellite superimposes to the navigation signal an authentication signal containing a secret authentication message corrupted by artificial noise (AN). We impose the following properties:

1. a)
   Authentication and navigation signals are synchronous,
2. b)
   Authentication and navigation signals are orthogonal and
3. c)
   The secret message is undecodable by the attacker due to the AN.

The legitimate receiver synchronizes with the navigation signal and stores the samples of the authentication signal with the …