[time-nuts] GPS PRN vs SV...??

n1jez at burlingtontelecom.net n1jez at burlingtontelecom.net
Sat Feb 9 07:13:10 EST 2008

J-track is nice. I also use Heavens Above. You do need to register, but it's 

For PRN32, once you log in, use spacecraft # 22657  (Navstar 32)

This URL will show the current orbital track.


For all the orbital kep elements I use Space Track.


Mike N1JEZ
AMSAT #29649
"A closed mouth gathers no feet"

----- Original Message ----- 
From: "Rex" <rexa at sonic.net>
Subject: Re: [time-nuts] GPS PRN vs SV...??

> Tom Van Baak wrote:
>>> Current status SVNs, PRN etc at:
>>> http://www.navcen.uscg.gov/navinfo/Gps/ActiveNanu.aspx
>> 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
> 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.
> 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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