[SystemSafety] Data across the UK National Grid

[Martyn Thomas]

On 11/10/2016 13:13, paul_e.bennett at topmail.co.uk wrote:
> Nowadays, many use the GPS time reference.

... which is so weak that it has to be dredged out of the thermal noise
in the circuitry - easy to jam and nearly as easy to spoof.
http://www.raeng.org.uk/publications/reports/global-navigation-space-systems

Martyn

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