If you take a look at the link I posted earlier, the advantages can be summed up as follows:-
* More robust in noisy environments using a low-cost commercial DBS dish antenna * More accurate timing signal * An alternate timing signal in case of GPS C/A loss The paper was written by Hugo Fruehauf, who is CTO at FEI-Zyfer, and in the '70s was Chief Engineer for the design and development of the initial Block-I Navstar-GPS satellite at Rockwell. Later he became President of Efratom. I agree that we are not talking about carrier phase tracking in this instance, and was simply trying to point out that WAAS/EGNOS equipped hardware allows some useful advantages for timing. Rob K -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr Bruce Griffiths Sent: 19 February 2007 21:33 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Carrier phase tracking Rob Kimberley wrote: > Interestingly, no one has mentioned the Augmentation systems like WAAS > or EGNOS where wide area correction data is transmitted down from > INMARSAT to improve nav accuracy. Primarily aimed at improved aircraft > navigation systems, it has a benefit for timing users. Zyfer have done > some work in this area, and I'll dig out a copy of the info and put it > on my web site, and post the link. > > Rob Kimberley > Rob The improvement in timing available with WAAS would appear to be a little better than that available from a good timing receiver but far short of that possible with carrier phase tracking. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
