[FOSS-GPS] RTKLib rover - base question

[Danny Miller]

Did you fix the base position? IIR, a problem I had early on was that I 
didn't do this. It doesn't automatically try to establish an exact 
location for the base, so without fixed coordinates entered into it, it 
doesn't produce a location for the rover.

Danny

On 7/23/2012 7:42 AM, Aljaž Osterman wrote:
> Dear all,
>
> I've just joined the mailing list. I'm not sure if this list accepts
> messages only from subscribers so perhaps you'll get it twice (the
> content is very similar).
> Instead of just introducing myself there's also 'a not so short'
> presentation of a problem I have with RTKLib.
>
> I've started working on an agricultural project involving precise GPS
> positioning. My previous use of GPS devices was limited to simple flight
> recording and car navigation.
>
> For our project we're using 2 ublox6 devices and RTKLib running on
> Windows. One receiver acts as a rover and another as a base. Each is
> connected to PC. Between PCs there's wireless connection.
> The problem I have is that from base data no location is calculated.
>
> What works:
> 1- both receivers work independently (each on its own PC) with ucenter
> (software from ublox)
> 2- both receivers work independently with RTKnavi if input stream is set
> to rover
> 3- rover works over wireless (navi+strsvr)
>
> To check where's the real problem I went on with only 1 receiver and 1
> PC. In Navi I tried once to set input stream as rover (position
> calculated ok, plotted) and next to set as base station. This time,
> position is not calculated. In Navi, 2nd square is light green (as
> before 1st with rover), but the middle one (the only one) never switches
> from dark green to light green. However, satellites are found and
> strength of signals is plotted (and changes with time so it works
> somehow) BUT they are all grey and never turn to color mode.
>
> I've found almost identical (and recent) thread but there was no
> solution or at least not described:
> http://lists.osgeo.org/pipermail/foss-gps/2012-May/000688.html
>
> >From the RTKLib manual I don't know if this behavior of RTKLib is by
> design or base/rover input streams can be both used in case of position
> calculation from a single receiver signal.
> Anyway, I still need to obtain the position from the base ...
>
> As proposed in other posts I've already set in u-center
> View-Messages view: UBX-CFG-PRT to Target=USB, P_IN=UBX+NMEA+RTCM,
> P_OUT=RAW
> and
> Configuration View - MSG: RXM-RAW, RXM-SFRB -> USB 1
>
> Thank you for reading so  far. I'll record the outputs tomorrow so
> there's more to come :)
>
> I'd appreciate your comments and advices.
>
> Best regards,
> Aljaz
>
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