How to trim a RINEX file with RTKLib

This article is a short tutorial on how to trim the starting and ending time of a rinex file from a base station. This is commonly done when we detect a problem with the base station observation, usually related to gaps in the base station.

This workflow can be applied for TrueView, TrueView GO and DJI sensors processed in LP360.

Download & Installation RTKLib

LP360 use RTKLib, but not all the modules. You can download the tools from the RTKLib website:

https://www.rtklib.com/

After downloading, unzip the RTKLib folder

Go to the bin folder and run rtkconv.exe

Trimming the RINEX file

1. Open rtkconv.exe
2. Add the rinex file
3. Select the output folder
4. Select the time start and time end
   Tip: Check the starting and ending time of the cycle in Trajectory Processing, SLAM Processing or DJI Cloud
   Add at least 5 minutes buffer between the starting&ending of the observation and the trajectory.
   
5. Select the output format as RINEX
   
6. Press Options:
   1. Select Rinex 3.02
   2. Select the constellations. Tip: Recommended to work with GPS, GLONASS, Galileo and Beidou. EU and NA can ignore QZSS & SBAS.
      
   3. Press Ok
7. Optional, Extra settings:
   1. Set the Interval: 1sec
   2. Set the Antenna Type in the Options section
8. Press Convert --> A new Rinex file is generated