[time-nuts] Common-View GPS Network

Bob Camp lists at rtty.us
Mon Apr 15 17:40:20 EDT 2013


Hi

One common requirement is a receiver that will give you "per satellite" information that you can turn into time. About the only way around that is to pre-determine a set of sats and flag the rest as "do not use". With the second approach, various geometric issues can get a bit exciting.  Either way good antenna locations and local clocks are needed. 

Do you have a specific receiver in mind?

Bob

On Apr 15, 2013, at 8:55 AM, Lachlan Gunn <lachlan at twopif.net> wrote:

> Hello all.
> 
> 
> 
> Having spent some time working over the last year on GPS time stability
> measurement, I'm keen to move onwards and upwards and have a go at
> common-view time transfer.  While my receivers are in the post, I have
> thinking about my next direction.  One thought that I have had is to try to
> write some software that can be used for real-time common-view (public if
> there is interest, but I am getting ahead of myself I think).
> 
> My question to those in the know is whether they have found common-view to
> be useful over medium timescales (say, an hour or four).  My understanding
> is that after a day or so the GPS signal itself becomes usable as a
> standard, so building a network is probably not tremendously useful over
> these sorts of time periods, but looking at such as figure 6 of [1],
> common-view should still be useful between a few minutes and hours.  Has
> anyone here tried using such a method to produce their own short-term time
> scale, or is one better off just taking the simple route and tracking GPS
> time directly?
> 
> 
> 
> Thanks,
> 
> Lachlan
> 
> 
> 
> 
> 
> [1] http://www.pttimeeting.org/archivemeetings/2008papers/paper45.pdf
> 
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