[time-nuts] Speaking of Costas loops

paul swed paulswedb at gmail.com
Tue Jul 2 14:37:00 EDT 2013


My lazy answer is GPSDOs work fine. This being time-nuts though and you did
use the word perfect means this is the start of a long thread.
Me I am staying with the Tbolt and 3801. Good enough.
Regards
Paul.


On Tue, Jul 2, 2013 at 2:21 PM, ed breya <eb at telight.com> wrote:

> Here we go again - the first send didn't seem to get through. This is the
> second attempt.
>
> This talk of Costas loops reminded me of something I wanted to investigate
> some day. I read somewhere a while back about carrier-phase measurements,
> and various methods for recovering the GPS carrier frequencies, including
> the Costas loop, and something with carrier-squaring. Nothing I found
> showed actual examples or detail of how this is done, only high-order
> mathematical descriptions.
>
> For my needs, I'm more of a frequency-nut - I usually don't care about
> getting time info, but I'd like perfect 10 MHz for reference. Can using
> only the carriers lead to simple ways to get the same (or better) frequency
> stability as a conventional GPSDO, but without the time and location info,
> or is it pointless to worry about it, and just go with full GPS decoding of
> everything? Or, is carrier-phase just an enhancement only if you already
> have the full GPS info?
>
> I know that the group could redesign the whole GPS system with tubes if
> necessary, considering recent philosophical discussions on that, so I think
> there's plenty of knowledge here about carrier-phase related stuff too.
>
> Ed
>
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