Hi to everyone,
I'm Mauro Ugarte, electronic engineering student at Universidad de
Concepción, Chile (spanish native speaker, so excuse my english). I'm
working on my undergraduate thesis taking part of a new small research
team whose objective is to develop a low cost system for real time
relative precise positioning (at least 0.6 m relative to some fixed
point, geodesic precission is always desirable but in our case not
crucial or extremely needed) of pedestrian rovers (5-15 kph), on a small
baseline (0 - 5 km), so discovering this mailing list almost makes me
cry ;'-).
As a start, we are going to follow some of the paths signaled here
(rtklib, gogps), but we lack of two fundamental parts:
1- First of all, in Chile there is nothing like a GPS reference station
network providing corrections on NRTK/NTRIP, which we could rely on.
There is an IGS station, though. It is near our lab (about 3 km),
codenamed CONZ and labeled "highrate_permanent" under GNSS/files > Data
Archive > File Browser at GNSS Data Center website
(http://igs.bkg.bund.de/index/index) and provides RINEX files that
should help at post-processing but not for real time aplications (please
correct me if i'm wrong).
2- Even when the excellent works aforementioned (rtklib, gogps) clearly
stated which GPS module was used to conduct the research (primarily the
u-blox LEA-4T), we noted that u-blox is getting that module out of the
market (the entire xxx-4x line) so doing some futuristic thinking, we
don't want to do all the research to rely on hardware with extinction
deadline.
So, considering the above, let me ask this:
1- Should we buy a RTK capable reference station module, that outputs
RTCM-RTK messages to use them as an input to rtklib/gogps? (example:
magellan DG-14), or could we use another low cost module that outputs
raw data measurements and "convert" that raw data into the corresponding
RTCM-RTK messages to feed rtklib/gogps?. I ask this because it seems to
me that RTCM V3.1 messages broadcasted by RTK reference stations
(1001-1002 for precision GPS L1 only, 1003-1004 for precision GPS L1 &
L2) could be "constructed" by raw data output, and messages 1005-1006
too, using the station position. Is all this possible or am i missing
something?
2- Do you know alternatives to LEA-4T, at low cost, that seems to you
that should stay around at least a couple of years and output raw data
which we can feed (or convert to feed) to rtklib/gogps?. We know that
there are the u-blox LEA-5T and LEA-6T, but those output raw data at 2
Hz and 5 Hz respectively, and the last one is just born so firmware bugs
could happen as they happened to LEA-5T, so if you know another faster
and cheaper, please let me know.
Finally, my gratitude for all the hard work done here.
Sincerely yours,
Mauro Ugarte A.
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