[FOSS-GPS] impressed

[Artyom G]

Dear all,

I also want to thank developers of RTKlib.
During last month one the students under my control tested nvs08c-csm with
RTKlib. At first we tried to get our coordinates relative to RTCM base
station. During 3 days the difference in fix-position coordinates didn't
exceed 1cm (on each coordinate). Distance between RTCM station and our
antenna was about 3 km. Then we determined coordinates between RTCM station
and second reciever. And at the end we determined coordinates between two
nvs08c-csm receivers (baseline about 8m).

We also checked manually baseline distance between two nvs08c-csm receivers
by subtracting coordinates of the first nvs08c-csm receiver (that were got
relative to RTCM station) from the coordinates of the second nvc08c-csm
receiver (that were also got relative to RTCM station). The result was the
same as RTKlib outputed.

I also appreciated strongly the posibility to stream data from receiver
through "strsvr". It was very comfortable to work with receivers output in
parallel with the student.

Thanks a lot for RTKlib.

On Sat, Mar 16, 2013 at 1:40 PM, Michele Bavaro <mic.bavaro at yahoo.co.uk>wrote:

>  Great, thank you!
>
> Too many times we hear the opposite.
> I am glad that - for once - someone has been willing to share his good
> results with RTKLIB combined with low cost receivers.
> To cool down you enthusiasm a bit, I anticipate that you should not expect
> much difference between a LEA-4T and a NV08C-CSM. Carrier phase noise is
> similar and despite tracking Glonass, that is still hardly usable by RTKLIB
> since it is affected by the well-known biases any Glonass receiver RF
> receive path is subject to. And RTKLIB "auto-calibration" feature is still
> not implemented.
>
> If I am allowed, I am under the impression that Tomoji's development
> road-map is adding more and more features to RTKLIB so that now resembles
> very much a professional product rather than an open-source *one-man*effort. Surely having multiple frequencies, multiple constellations, super
> standalone post-processing (PPP), and beautifully coloured GUIs is great
> and we are always grateful to him for that. But I wonder how many users
> desire to have a robust and very lean single frequency GPS RTK algortihm.
> One that can run headless on Android perhaps, or even on a STM32F4 bare
> metal. One that can fill the gap with the most common quirks of low-cost
> receivers (e.g. random phase slips) and use some sort of pre-processing
> RAIM to indentify and exclude outliers. One that can be integrated in
> robotic automatic guidance projects.
>
> Back to receivers, the only real difference between NV08C-CSM and LEA-4T
> is that the latter is gone out of production several years ago, and uBlox
> has not replaced it with an equally performing module. 5T and 6T in fact
> can only measure at 10Hz under certain conditions and they are not
> certified to do that anyway.
> So if you need a module to build a commercial product you only have three
> choices right now: NVS NV08C-CSM, ublox 6T/P, and Skytraq S1315F-RAW.
> Of the three, only the first has to my knowledge a clear development and
> upgrade path. There are rumors that the new revision of NV08C -to come out
> later this year- will fully support Galileo and, as most of us know,
> Galileo Signal In Space specifications guarantee interoperability with GPS
> by design. Thus, as soon as there will be a sensible number of Galileo
> birds in the sky, dual constellation low-cost RTK will become easily
> useable by all of us. Not to mention dual frequency of course, as L5 and
> E5a bands overlap.
>
> Congratulations again and keep it up,
> Michele
>
>
>
> On 16/03/2013 09:04, napoleon wrote:
>
> Hello,
> My setup is:
> Rover:40db tallysman antenna, lea-4t receiver
> Base: leica 1202gg antenna ntrip caster connection,rtcm 3 data.
> baseline 6.68 m
> base -kinimatic solution
> I searched for the lea-4t configuration, i set it up, i pressed ''start''and
> i had first fix after 1.5 minute and stable fix after 7 minutes....(less
> than 2.5cm)-MY FIRST TRY
> Looks like a joke.
> I am totally impressed.
> I am planning a new config with tallysman gnss antenna and nvs-08 and i am
> afraid to imagine the result.
> I will also test vrs and max solutions from the base network (i guess i can
> feed max solution through rtcm 3 to rtklib)
> Anyway i have to say again that i am impressed and to thank you ttakasu and
> team.
>
>
>
> --
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