[time-nuts] Does GPS time reception work everywhere all of the time?

[Brian Kirby]

I read its hard to get a position fix over the poles of the earth - its 
related to the orbits of the GPS satellites.  But to get time, you 
really only need one satellite.....

On 8/28/2010 6:31 PM, Bill Hawkins wrote:
> I'm involved with time synchronization of control system
> computers for multi-national businesses. GPS springs to
> mind as a way to synchronize time anywhere. Or is it?
> What about monsoon rains?
>
> The Internet is available almost everywhere that control
> computers are used, but many users prefer to use a data
> diode between them and the Internet. Control computers
> are now essential for manufacturing processes. Some of
> the processes run constantly for years without stopping
> for any kind of security update. Some of the downtimes
> cost millions of dollars per day.
>
> A GPS time system allows the control systems to be
> synchronized in time, so that messages sent periodically
> through the data diodes will have the correct time stamp
> on various events that occur in the process.
>
> But does that work everywhere all of the time? Where can
> I find answers?
>
> Thanks in advance, as we used to say.
>
> Bill Hawkins
>
>
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