How to calibrate base correctly
Canada provides a government service where you can upload raw GNSS data in order to compute precise positioning with PPP. PPP means Precise Point Positioning, it is an alternative method to RTK. Instead of calculating double-differences it uses precise orbit data iin order to calculate submetric positions.
Place your receiver on the desired point and log raw data for at least two hours (this depends on the quality of the coordinates you want to get). Then convert your raw data into RINEX format (see RTKCONV).
Then go to : http://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php.
Create an account an open a session. You should get to this screen :
Enter your email address, select "Static" and "ITRF". Then upload the RINEX file. You will then receive a notification on your email address when the processing is finished.
It is often difficult to get precise base coordinates. We implemented a function that averages base's position over time and feeds corresponding coordinates into rover's configuration. The function is located in Admin tab (Rover mode) :
You can select a time of survey in seconds. The higher this time, the higher the precision of the coordinates. It is recommended to calculate the position over several minutes. Once the process is completed it will automatically change rover configuration aund launch rover mode. In order to work, base must be configured to send differential data in UBX mode.
