[time-nuts] GPS PRN vs SV...??
magnus at rubidium.dyndns.org
Sat Feb 9 05:29:26 EST 2008
From: Rex <rexa at sonic.net>
Subject: Re: [time-nuts] GPS PRN vs SV...??
Date: Sat, 09 Feb 2008 02:16:28 -0800
Message-ID: <47AD7D7C.8090802 at sonic.net>
> 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
Ephemeris data is alread available:
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
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
> 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?)
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