[time-nuts] How to achieve best results from U-Blox survey-in

Bob Camp kb8tq at n1k.org
Sun May 8 23:08:01 UTC 2016


Hi

SBAS is normally turned off for timing because historically it was not optimized for timing use. The 
“try it and see” approach tended to show it caused more trouble in a timing application than it fixed. 
For survey on an L1 device, it is a good idea to use it. 

Bob

> On May 8, 2016, at 4:32 PM, Pete Stephenson <pete at heypete.com> wrote:
> 
> On Sun, May 8, 2016 at 7:25 PM, Bob Stewart <bob at evoria.net> wrote:
>> Yes, disable all except GPS sats.  Also, turn off SBAS, set your max and min number of sats (defaults are probably what you want), and the satellite elevation mask.  The elevation mask defaults to 5, but can you really see that low?
> 
> Hi Bob,
> 
> Out of curiosity, why would one turn off SBAS? My first instinct is
> that SBAS support could only improve the accuracy of one's fix, as it
> supplies additional correction information that improves on the normal
> GPS signal. I would (perhaps naively) think that enabling SBAS during
> the surveying would improve the results.
> 
> Of course, I could very well be mistaken and would be happy to be
> corrected by those more knowledgeable.
> 
> Cheers!
> -Pete
> 
> -- 
> Pete Stephenson
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