Thanks Bob, Interesting stuff.
Has anybody else dug into any of this?
I have no experience with using LI/L2, or how good it is,
But as far as making Tbolt's better, No problem to make them > "2 or 3X"
better all the time, by going to an external better optimized controller
algorithm.
Lady Heather has a simple external PID controller built in that shows proof
of concept.
Much better could be done with the Tbolt if there is a need, using a simple
PIC micro and add that into something like the Tbolt monitor.
ws
**************
Hi
I've been digging around at acc.igs.org. They seem to think that their clock
models are good to below 0.05 ns. They compare that to a 2 ns number for the
"as broadcast" models. 2 ns is a pretty familiar number if you look at a lot
of TBolt plots. All of their data is online and available for download at
some point in time past live. The longer you wait the better the data.
They really like the idea of L1/L2 receivers and fancy post processing. They
also are after a lot more than just time. I still have not noticed any
complete L1/L2 receivers for < $100, so I can't do their full solution
approach. Ionospheric correction seems to be one big thing you loose by
going single freq.
There's a pretty good summary of all that at
http://acc.igs.org/UsingIGSProductsVer21.pdf
Since the TBolt sort but not quite of does carrier phase you might be able
to use their data to improve things. I doubt that you would get to 50 ps,
but even a 2 or 3X improvement would be worthwhile. Even getting it some of
the time (midnight?) would still be useful. It would be a log lots of data
and compare thing - not that unusual.
Has anybody else dug into any of this?
Is there a secret stash of cheap L1/L2 fixed location receivers out there
that I haven't stumbled across?
Can you really win the lottery by picking up the winning ticket off the
sidewalk?
Lots of questions....
Bob
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
