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Hello!

I need some SBAS raw packets and apparently this should be available in
RINEX files v2.1...

http://www.aiub.unibe.ch/download/rinex/geo_sbas.txt

The problem is that the RINEX files I can generate from my Javad
reference receiver don't have any data from geo-stationary SVs?! I've
also google'd the internet and can't find any example RINEX files that
actually contain the geo data.

Does anyone have any ideas where I could find a RINEX file with some
SBAS data in, or alternatively a set up that would definately be
capable of generating the required data?

Many thanks,

Jim

I need some SBAS raw packets and apparently this should be available in
RINEX files v2.1...
http://www.aiub.unibe.ch/download/rinex/geo_sbas.txt

This link only describes a proposed addition to the RINEX format,
and is not part of the 2.10 standard. It's also not included in the
proposed 2.11 draft standard, so perhaps there wasn't much interest
in it?

For EGNOS you should be able to get the raw SBAS packets
over the internet using SISNeT:
http://esamultimedia.esa.int/docs/egnos ... sisnet.htm

Hope that helps,
Peter.

Jim,

Try ftp://ftp.nstb.tc.faa.gov/pub/NSTB_data/ see the readme.
There is daily binary files from receivers. the NSTB messge type 5 has
the 250 bit SBAS message from WAAS.

Hi,

Many many thanks... I had already found this, and although it looks
*perfect* for my requirements, the CRC numbers on the end of the
subframes are rubbish?! I'm not sure why, but it confused me for a
while?!

Thanks again,

Jim

Try the WAAS sites, some of the older OEM-3 receivers check the CRC and
only output a message if the CRC is good, but they strip off the CRC
and the 24 bits in the NSTB format file is just whatever happens to be
in location in memory. The GEO only files are a composite from all
the sources, but the NSTB OEM-3 data is in the beginning of the search
list, so it is rarely built from the WAAS data.

The WAAS receivers pass the whole message see the
wSSSwrspNc1_RRID_wwww_dd.gz files. SSS is the WAAS site, N is the
receiver at that site (1 to 3) RRID is the NSTB receiver ID label,
wwww is the long GPS week, dd is the day of week .