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<div class="moz-cite-prefix">Great, thank you!<br>
<br>
Too many times we hear the opposite.<br>
I am glad that - for once - someone has been willing to share his
good results with RTKLIB combined with low cost receivers.<br>
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.<br>
<br>
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 <b>one-man</b> 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.<br>
<br>
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.<br>
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.<br>
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.<br>
<br>
Congratulations again and keep it up,<br>
Michele<br>
<br>
<br>
On 16/03/2013 09:04, napoleon wrote:<br>
</div>
<blockquote cite="mid:1363421082429-7572660.post@n2.nabble.com"
type="cite">
<pre wrap="">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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