[time-nuts] Best Chance GPS module
kb8tq at n1k.org
Sun Dec 4 13:50:49 EST 2016
If you watch the “jump” process. The thing that inevitably is being added or subtracted is a long path
sat. For timing those are the worst of the bunch. Unless you have a way to fully correct the ionosphere
(really good data or a multi band receiver) they will always be contributing an error. This is where the common
advice “crank up the minimum elevation angle” comes from. Since it degrades survey performance, you
can’t do it blindly. If you …ummm … errrr …. have a computer program to work out the angle that always
gives you 5 sats in view, you probably could come up with a pretty good number.
> On Dec 4, 2016, at 12:53 PM, Mark Sims <holrum at hotmail.com> wrote:
> The Trimble timing receivers have a "single satellite" operating mode that says to only use the highest elevation satellite that it sees (or you can set a specific single satellite to track). It would be interesting to see how the performance compares to its standard "overdetermined clock" mode. It might help in situations where you have a poor sky view.
> The Trimble devices tend to jump around quite a bit whenever the tracked satellites it is using changes. Having an accurate position helps minimize the jumps.
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