From: Alberto di Bene <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Jupiter GPS receiver Date: Thu, 05 Jan 2006 19:02:25 +0100 Message-ID: <[EMAIL PROTECTED]>
> Magnus Danielson wrote: > > > >>I looked in my data and their spec sheet shows +/- 1 microsecond. But, > >>I beleive this was much better than that. I cannot find it, but I > >>beleive I seen a report where somebody compared the Jupiter and it was > >>in the 120 to 150 nanosecond class. > > > > > > +/- 1 microsecond is the old worstcase garantee for the GPS system. It is > > was > > you can expect from a GPS with lack of satellites, SA and old style > > satellites > > going out of date in their predicted orbits data. > > > > These days we have better satellites, full system and no SA. Add to that > > much > > improved receivers (no more 1 channel receivers as in the good old days). > > > Brian and Magnus, > > thanks for your input. It looks like I can, after all, use that Rockwell > board > without resorting to huge integration times for the 1pps signal. > > Just curious on another topic : I have seen advertized GPS boards with > 20-channel > capability, Given that, at least based on my direct experience, even with a > clear > horizon you rarely have 12 satellites in view, what does buy you having that > capability available? TNX. Forward compatibility to Galileo. Then you can track GPS and Galileo at the same time. Also, you can track the additional signals from the modernized GPS satellites. I don't expect the boards of today to be fully optimized for that just yeat, but they will certainly outperform GPS only solutions which only does L1 C/A. Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
