[time-nuts] Quality of timing mode GPS vs survey accuracy

[jimlux]

On 5/8/20 3:38 PM, Charles Steinmetz wrote:
> Jim wrote:
> 
>> I'm attaching a screen shot of 4 receivers, taken at the same time
>> (within seconds,not time-nuts same time) All sitting on the table 
>> together.
> 
> One might expect closer agreement if all of the receivers were fed from 
> one antenna through a splitter, but even then each rx will choose its 
> own series of constellations and will switch constellations at different 
> times.  There will also be phase dispersion among the rx input filters. 
>   And lots of other small effects.
> 

one might so expect. But I'm not too sure.

There's >10 meters difference in the positions (in the X coordinate of 
the ECEF position alone).

They're all tracking the same satellites (except b203)

but the S/N is noticeably different among them.