[time-nuts] Best Chance GPS module

Bob Camp kb8tq at n1k.org
Sun Dec 4 11:04:45 EST 2016


Simple example:

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[1]. Unfortunately, I have not
> seen any good analysis of the achieved performance.
> 			Attila Kinali
> [1] "WAAS for Telecom applications", Hugo Frühauf, 2003, updated 2011
> http://hugofruehauf.com/pdf/24-WAAS_for_Telecom_2003-upd_2011.pdf
> -- 
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