Perhaps someone could start a new thread with a different title since this has evolved to something else then my request. By the way the response to my question was answered by the group and its true the first LO does not need to be locked for at least code tracking. I really didn't prove its needed for carrier tracking. Thanks everyone. Paul WB8TSL
On Tue, Apr 4, 2017 at 9:55 AM, jimlux <[email protected]> wrote: > On 4/3/17 9:32 PM, Logan Cummings wrote: > >> Dave, >> >> I was able to find [2] here: >> http://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Akos_ >> IONGPS_2003_3FreqRX.pdf >> >> > > So those folks were trying to use 1 ADC for all three bands, so they had > to choose a sampling rate that lets them separate the signals later in > software. > > But that ADC is a MAX104 - a 1GSPS, 8 bit converter - that draws 5 Watts!!! > > I'm not sure that's a good trade against a 1 or 2 bit converter for each > band, in terms of the downstream data rate and processing. > > > > > > [3] was harder, and I don't have a link but a google search for the title >> in quotes got me a link on semanticscholar that let me download the PDF. >> >> Interesting stuff! >> >> Hope that helps, >> -Logan >> >> On Fri, Mar 31, 2017 at 9:17 AM, David C. Partridge < >> [email protected]> wrote: >> >> links [2] and [3] give 404 errors >>> >>> Dave >>> >>> -----Original Message----- >>> From: time-nuts [mailto:[email protected]] On Behalf Of Attila >>> Kinali >>> Sent: 31 March 2017 12:35 >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] GPS first LO need to be locked? >>> >>> [2] "A Prototyping Platform for Multi-Frequency GNSS Receivers", by >>> Akos, >>> Ene and Thor, 2003 http://waas.stanford.edu/~wwu/papers/gps/PDF/ >>> AkosIONGPS033FreqRX.pdf >>> >>> [3] "Design of a GPS and Galileo Multi-Frequency Front-End", by Parada, >>> Chastellain, Botteron, Tawk, Farine, 2009 http://202.194.20.8/proc/ >>> VTC09Spring/DATA/04-04-01.PDF >>> >>> >>> _______________________________________________ >>> 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/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/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.
