[time-nuts] Common-View GPS Network

Magnus Danielson magnus at rubidium.dyndns.org
Tue Apr 16 18:46:11 EDT 2013


On 04/16/2013 09:55 AM, Poul-Henning Kamp wrote:
> In message<A687BF7F4A1642E8BA7EDDA7432A3969 at pc52>, "Tom Van Baak" writes:
>
>> When you look at the actual clock solutions (which are in the @@Hn
>> message) you will be surprised at the variance.
>
> A lot of that variance is because the position-hold coords are wrong.
>
> I tried using the @@Hn data to "sneak" up on the right coords and got
> some pretty good results, but the process too forever (as in: Months)
>
> See:
> 	http://phk.freebsd.dk/raga/sneak/
>
> The improvement in the finished timing solution from the oncore is
> quite marginel because on average you have satellites on all
> sides of your antenna and the errors mostly cancel out.
>
> The notable exception to that is where I live: at 56N.
>
> 56N is at the top of the GPS orbits, so satellites never venture
> north of me, and I'm not sufficient north to have any benefits from
> the satellites which rise above Canada/Alask on the other side of
> the north pole.
>

Did you look at the pseudo-range correction data as an alternative approach?

Cheers,
Magnus


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