[FOSS-GPS] introduction and first help request

[Mauro Ugarte A]

Hi Eugenio,
>> provides RINEX files that should help at post-processing but not for real
>> time aplications (please correct me if i'm wrong).
>>      
> I checked here http://www.igs-ip.net/home and it seems that CONZ
> station data can be accessed via NTRIP:
>
> IP: www.igs-ip.net
> Port: 2101
> User&  pass: you have to register here http://igs.bkg.bund.de/ntrip/registeruser
>
> This is the source table line for CONZ:
>
> STR;CONZ0;Concepcion-TIGO;RTCM
> 3.0;1004(1),1006(15),1008(15),1012(1),1019,1020,1033(15);2;GPS+GLO;IGS;CHL;-36.84;286.98;0;0;LEICA
> GRX1200GGPRO;none;B;N;3600;BKG
>
> It already has all the messages you could want, and if it is not
> located where you need it to be, at least you can use it for some
> initial testing!
>    
That is an excellent news!!!  Who doesn't know what to look for, can't 
understand what he finds!!! We certainly need more study. We surely 
going to be using it for initial testing!!

>> 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?
>>      
> That is right, you can do it either ways: buy a module with RTCM
> output or construct RTCM once you got raw data. Obviously the second
> option requires much more work and trial&error.
>    
Excellent news, again. We ordered an OEMStar module that outputs RTCM 
corrections (we thought that only the DGPS ones, but as Tomoji Takasu 
said, maybe it should output RTK corrections as well). The NTRIP station 
that you just provided us is going to be great for lab testings, but our 
project is aided to provide precise positioning far away from cities 
(farming, open sea, forest), so if we can build reference stations with 
low cost GPS modules, we are going to be more than happy.

>> Do you really need 10Hz for pedestrian rovers?
>>      
One of the aplications that we are thinking about is the ability to 
recognize fast enough that somebody (pedestrian rover) entered a 
dangerous area, and assure that it gets an alarm before its too late, so 
the faster that it sends its corrected position, the better.

Thanks for your great answers and help, they pointed us in the right 
direction..

Best regards,

Mauro Ugarte A.


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