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by Salmonfisher11 567 days ago
Galileo offers cryptographic protection (OSNMA) of their positioning data. So not spoofable. For free.
3 comments
evanjrowley 567 days ago
Link for reference: https://www.gsc-europa.eu/galileo/services/galileo-open-serv...

Recent news: https://www.euspa.europa.eu/newsroom-events/news/galileo-get...

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lxgr 566 days ago
Not quite unspoofable, at least once the signal has been received for time-delayed rebroadcasting/meaconing.

But spoofing does become detectable by any receiver with a sufficiently accurate clock (I think for complete protection it would have to be an atomic clock though).

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toomuchtodo 566 days ago
Any insight as to why newer GPS satellites do not offer similar capabilities?
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bean-weevil 566 days ago
The GPS project began in 1973. Digital signatures were invented in 1976. I'm guessing adding it on after the fact would have been very expensive.
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toomuchtodo 566 days ago
There have been progressive improvements as new satellites are brought into service, and those end of life retired. Perhaps backwards compatibility?

https://en.wikipedia.org/wiki/GPS_signals#Legacy_GPS_signals

https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_...

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