Hi Ok, cook book style:
Take the carrier, amplify it up, drive an agc to keep it up. Drive the carrier into a full wave bridge rectifier made with low barrier diodes Take the rectified output and feed it into a bandpass filter at 2X the carrier The output is the squared carrier There are at least a half dozen other ways to do the squaring. Bob On Jul 2, 2013, at 2:21 PM, ed breya <[email protected]> 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
