[ntp:questions] GPS

Chris H ntp at archnetnz.com
Tue Oct 5 00:33:41 UTC 2010


With Selective Availability enabled would that cause time accuracy
issues with the signals from the satellite?

Or are they independent of each other?

On Mon, 2010-10-04 at 18:40 +0100, David Woolley wrote:
> binh tran thanh wrote:
> > Hello,i'm from Viet Nam
> > Now i'm using GPS et333
> > do u can explain for me the meaning (in GPGGA):
> > - position fix indicator
> > - hdop
> > -checksum
> > -how to know the acurate of GPS's signal
> 
> None of the above.  Generally, for the purposes of ntpd, the GPS time 
> transfer error is dominated by errors outside of the GPS system and you 
> need to analyse your own system to determine them.
> 
> Even for position purposes, if the US were ever to turn on selective 
> availability again, the error would increase without any of the error 
> indicators increasing.
> 
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