[FOSS-GPS] impressed

Tue Mar 19 00:22:36 PDT 2013

Hello,
I am trying to figure out rtknavi settings. I am using openmoko freerunner and would like to get relatively precise positioning (using RTK).
I have access to ntrip, providing Type 1 (differential GPS corrections), Type 3 (BS parameters), Type 18 (uncorrected carrier phase measurements),
Type 19 (virtual distance uncorrected observations). 

When working with Type 18 and Type 19 messages, should Input Stream be set as (2) Base Station or (3) Correction?
Options for positioning mode should be set as "Kinematic"? 

The idea is to get the following simple architecture:
freerunner --> rtknavi <---- ntrip

Thanks a lot for your help
On Mar 16, 2013, at 11:46 PM, Artyom G <gnsssdr at gmail.com> wrote:

> 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.
>> 
>> 
>> 
>> --
>> View this message in context: http://open-source-gps-related-discussion-and-support.1099874.n2.nabble.com/impressed-tp7572660.html
>> Sent from the Open Source GPS-related discussion and support mailing list archive at Nabble.com.
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