[FOSS-GPS] introduction and first help request

Wed May 26 19:31:16 EDT 2010

Dear Mauro

> 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?

NovAtel OEMStar supports RTCM output including
GLONASS (but L1 only).

I plan to add the function to convert the receiver raw
data stream to RTCM in future version of RTKLIB.

> 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.

I also recommend NovAtel OEMStar supporting 10Hz
and GLONASS (with options). No program for RTK-
GPS/GLONASS with RTKLIB 2.3.0. Just an probram is
a little more expensive than ublox.

Regards,

Tomoji TAKASU
WWW: http://gpspp.sakura.ne.jp

--------------------------------------------------
From: "Mauro Ugarte A" <mauro.ugarte at cefop.udec.cl>
Sent: Thursday, May 27, 2010 7:13 AM
To: <foss-gps at lists.osgeo.org>
Subject: [FOSS-GPS] introduction and first help request

> 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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