Broadcasted (or equivalent) ephemeris data download

Hi, I understand his may be a recurring question... :)
Does anyone knows a website were it's possible to download (nearly)
realt time ephemeris data for GPS constellation?
I found a lot of website offering precise ephemeris data for post-
processing (usually sp3 format), but that is not what I need.
I'd like to use the data to provide my receiver with "fresh" data from
the web, so I need something similar to broadcasted data

Thanks!
Claudio

claudegps wrote:


Try: http://celestrak.com/GPS/
http://gps.afspc.af.mil/gps/Current/current.alm
http://gps.afspc.af.mil/gps/Current/current.al3

Almanac data only, right?
I was looking for ephemeris, but thanks anyway.

Claudio

Try this:

ftp://cddis.gsfc.nasa.gov/gps/data/hourly/

For today:

ftp://cddis.gsfc.nasa.gov/gps/data/hourly/2009/

ftp://cddis.gsfc.nasa.gov/gps/data/hourly/2009/296/20/

I've never used the hourly data from this site, just the dailies. But
a sample size of 1 shows current data at U. of Delft:

ftp://cddis.gsfc.nasa.gov/gps/data/hourly/2009/296/20/dlft296u.09n.Z

You want the " *n.z" files, with the "n" denoting the ephemeris
(navigation) data.

List of sites:

http://www.igs.org/network/list.html

Links to RINEX format description, if needed:

http://www.igs.org/components/formats.html

If you want something local or regional, you may be able to pick one
site that meets your needs.

If you want global data, you will have to download files from several
sites.

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Thanks Ed!