From: "Rob Kimberley" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Carrier phase tracking Date: Mon, 19 Feb 2007 17:55:49 -0000 Message-ID: <!&[EMAIL PROTECTED]>
> There is an advantage in more channels...as in the main these are navigation > GPS receivers designed to work in all environments ( i.e. stuck on the > inside of your windscreen/windshield), and with all sorts of obscuration > problems. Having more processing channels does help give best chance of best > fix. Indeed. We tend to be concentrated about our well-placed antennas (eh... well, we should have that, right?). > 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. Each WAAS signal tracked consumes another channel. If you look at the allocation tables, there is actually ALOT of channels allocated for WAAS and pseudolites. The signal structure is similar enought for allowing fairly easy integration into receivers, which is kind of the point. :) Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
