Converting ubx file to RINEX; not obtaining .nav files, why?

Question

I'm trying to convert .ubx file to RINEX .obs and .nav files with RTKLIB. But I found that sometime only .obs file can be generated while .nav can not.

What kind of data do I need in .ubx to generate .nav file? Does anyone have any idea why?

Answer 1

First of all you need to enable both messagetypes RXM-RAW and RXM-SFRB.

To make sure the conversion from .ubx-Files works properly you should disable every other messages (use u-center). Sometimes RTKLIB does not work well with mixed files. UBX files are binary files and should not be filled up with NMEA-Messages.

My LEA-4t runs on a RasperryPi with a Python-Script I developed. It is a Statemachine that only puts out the RXM-Messages that are needed. It works well for me.