[FOSS-GPS] impressed

[Michele Bavaro]

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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