[OSM-talk] DGPS on GPRS?

[Clive Jones]

Andy Robinson wrote:
> I'd agree that DGPS is probably not worth it within OSM. However SBAS over
> the Internet is a different matter and I think what the original interest
> was about. Subject perhaps should be SBAS on GPRS

I'm sticking with a variation of DGPS rather than SBAS ;)

Some links that caught my attention last week:

1) http://igs.bkg.bund.de/root_ftp/NTRIP/documentation/Chen_GNSS2004.pdf
2) http://igs.ifag.de/ntrip/ntrip_toc.htm
3) http://www.precision-gps.org/

Someone (sorry - name forgotten) at the Midlands OSM meeting had an 
interesting homebrew receiver. based on a cheap ublox module.  That may be 
able to produce RTK RTCM 104 messages, using the software from 3).

It could be used as a basis for a 'free' ntrip basestation, using the
software at 3) ported to gcc and updated to feed the NtripServer
implementation from 2).  Not necessarily for real time corrections, but
could be very useful for post-processing.

OSM could then run a NtripCaster, as most current service offerings seem
to cost money.  BTW NtripCaster is derived from icecast.

Could potentially be more accurate than SBAS?

C>.