[time-nuts] Best Chance GPS module
kb8tq at n1k.org
Sun Dec 4 11:04:45 EST 2016
Single sat straight overhead, well compensated by broadcast ionosphere. All survey error in the X direction.
Multiple sats all clustered at the horizon. Cluster located on the +X axis. Ionosphere not well modeled over the
much longer path.
Yes this *is* a bit contrived. It’s also what can happen in an “overhanging balcony” sort of antenna location. I can
also make it happen pretty easily from a USB stick indoors and locating “just right” relative to the windows.
> On Dec 4, 2016, at 10:45 AM, Attila Kinali <attila at kinali.ch> wrote:
> On Sun, 4 Dec 2016 09:46:45 -0500
> Bob Camp <kb8tq at n1k.org> wrote:
>> It’s possible (but unlikely) to have a single sat in a “perfect” location give
>> you a better solution than a group of sats in a really crummy location …..
>> This is yet another reason for wanting a full sky view. Seeing several
>> sats at a crummy angle may still be a less than ideal thing.
> Frühauf proposed using satellite dishes on WAAS satellites for
> improved timing accuracy/stability. Unfortunately, I have not
> seen any good analysis of the achieved performance.
> Attila Kinali
>  "WAAS for Telecom applications", Hugo Frühauf, 2003, updated 2011
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