[hpsdr] need time standard good to a microsecond or better

[Glenn Thomas]

According to the GPS interface control document, the accuracy of the 
GPS time as it leaves the SV is 97 nanoseconds, one sigma. Errors due 
to propagation (varying index of refraction along the signal path(s) 
and receiver equipment biases are not included in this.

Most GPS receivers are built for position accuracy. While the 
receiver needs to keep an internal clock that can be corrected to 
within some small number of ns, the accuracy of any time that is 
output is at the mercy of whoever designed the receiver and how much 
attention they paid to time accuracy.

73 de Glenn wb6w


At 08:39 AM 12/14/2007, Graham Haddock wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>Warren:
>
>I would think that any of the GPS receivers with a time-tick output
>would give you one microsecond accuracy, even without WAIS.
>WAIS should take it down below 1/10 microsecond.
>
>--- Graham / KE9H
>
>==
>
>L. Van Warren wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > I am doing some radio astronomy work and need a free standing portable time
> > standard good to better than a microsecond (1000 feet). Can I get that with
> > GPS/WAIS using HPSDR gear? Other suggestions?
> >
> > All the best,
> >
> >
> > L. Van Warren MS CS, AE
> > wdv.com
> > AE5CC
> >
> > "Slow is Fast and Fast is Slow"
> >
> >
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