[time-nuts] Speaking of Costas loops
paulswedb at gmail.com
Tue Jul 2 17:12:05 EDT 2013
Ed nothing attached
On Tue, Jul 2, 2013 at 2:05 PM, ed breya <eb at telight.com> wrote:
> 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.
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