Post processing
First to do in order to post-process data is to retrieve logs from base and rover. WinSCP is a good tool to connect to the Edison in SSH. Enter the IP adress of the board and press Connect.
Go to :
/usr/drotek/logs/
and select the files you want to download. RTKLIB automatically logs both base and rover data in this folder.
These logs only contain raw data in U-Blox binary format. It is necessary to convert them to RINEX format (Receiver INdependant EXchange format) before processing them. Inside RTKLIB you can find RTKCONV, a GUI program that will do this conversion.
First select your raw data file :
The output paths will be set automatically. Click on Options :
Check that the boxes corresponding to the satellites you want to process are checked. Then click Ok and Convert. Repeat this operationn with all your raw data files.
RTKPOST is the GUI program that will post-process RINEX files. First run RTKPOST and click on Options :
You will find in this window all the parameters corresponding to the .conf configuration file. You can either enter them manually or click on "Load" and select a configuration file.
Select on the main window the observation file corresponding to the rover (RINEX file provided by RTKCONV) :
Repeat this operation for the base :
Click on Execute. This will generate a .pos position file.
RTKPLOT is a GUI program that can plot the .pos position file generated by RTKPOST. It can also read files recorded by RTKLIB in "llh" format (See Configuration File). Open RTKPLOT and open a .pos file :
Fix positions appear in green, float in yellow and single in red. By pressing "Google Earth View" you can see the position in Google Earth View :
However be careful! In some zones Google Earth's precision might vary from meters to several tens of meters. That means that you can sometimes see strong offsets between your real position and satellite views.
RTKPLOT is also useful to monitor other parameters, such as number of satellites, deviations, velocities, accelerations, age of differential corrections, ...
