From: Rex <[EMAIL PROTECTED]> Subject: Re: [time-nuts] GPS PRN vs SV...?? Date: Sat, 09 Feb 2008 02:16:28 -0800 Message-ID: <[EMAIL PROTECTED]>
> Tom Van Baak wrote: > >> Current status SVNs, PRN etc at: > >> > >> http://www.navcen.uscg.gov/navinfo/Gps/ActiveNanu.aspx > >> > >> Bruce > >> > > > > That's a good URL. Thanks. > > > > More on the SVN vs. PRN issue... > > > > When I mistrust a GPS receiver and want to check where a > > satellite really is, I use the NASA satellite tracker: > > > > http://science.nasa.gov/Realtime/jtrack/3d/JTrack3D.html > > > > If any of you haven't heard of, or used this java applet yet, > > I highly recommend it. After you click on +J-TRACK 3D, > > click on Satellite->Select and pick any GPS satellite. > > > > The only trouble: our SV of interest, GPS BIIA-10 (PRN 32), > > is missing from the list (perhaps because it is still marked > > unhealthy?), so we can't get its orbit or ground track. I sent > > a note to NASA and we'll see if they fix it. > > > > If any of you know of another satellite tracking web site that > > shows SVN23/PRN32, let us know, ok? > > > > By the way, if one takes a screen capture of each GPS SV > > in the Jtrack3D list, you get this cute GPS orbit animation: > > > > http://www.leapsecond.com/pages/gps-orbit/ > > > > /tvb > > > > > > > Thanks Tom, I'm trying to follow this discussion with my limited > knowledge and see if my HP z3816a with a UT receiver knows about this > new satellite. My random looks have seen a 31 PRN but not a 32. So > knowing when the new 32 should be visible in N. Cal would help a lot. I > tried your link to the nasa.gov jtrack page, but I don't see how I get > to anyplace where I can select a GPS satellite to track. Sorry if I > missed something obvious. > > Any hints or clarifications on how to predict when any gps satellite > should be in view here are appreciated. I think I could get Ham > satellite tracking software and find the ephemeris information for the > satellites somewhere, but I was hoping for an easy way for just the GPS > sats. Ephemeris data is alread available: http://www.navcen.uscg.gov/archives/gps/2008/ALMANACS/SEM/039.AL3 32 23 0 1.44729614257812E-02 9.04464721679688E-03 -2.53930920735002E-09 5.15345068359375E+03 9.07266139984131E-01 -4.24016833305359E-01 -3.47391366958618E-01 2.25067138671875E-04 1.09139364212751E-11 63 9 Should be sufficient to predict sky-view. We don't know yeat at what time it is expected to be set operational. We need to await another NANUS detailing that, as being indicated in NANUS 2008016: http://www.navcen.uscg.gov/archives/gps/2008/NANUS/2008016.nnu > Thanks for the heads-up on the new satellite with this binary new-bit > PRN. (That is the potential issue with why some receivers may not handle > it -- correct?) Indeed. :) Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
