In my previous blog PPP Precise Point Positioning with averaging 3 years ago I used the method “averaging” to get a precise position.

This time I used this Canadian service CSRS-PPP for post-processing the data.

So I prepared my GNSS receiver ZEF-F9P for this job. This is well documented in the man page for “gpsrinex”.

So I run over several days commands like this:
gpsrinex -i 30 -n 1440 -f gpsrinex2025322205923.obs
This would collect the information for a period of 12 hours.
2025322205923 means: year 2025 day number 322 of this year at 20:59:23 h

If this job is finished it’s theoretical possible to upload this file immediately to the Canadian service. But then you get a result as product type “ultra rapid”. If you wait two days or so it’s “rapid” and if you wait more than two weeks you get the “final” version. Because it takes some time for them to get all the correction data to make a qualitativ high post processing with my collected data.

If one submits this file one will get the result per e-mail. This e-mail may take several hours but it could also be available after several minutes. It depends on how much requests are in the queue.

As processing mode I selected “Static” and “ITRF” (International Terrestrial Reference Frame)

This is the final result

  date     latitude     longitude     high  
  2023117170821     48.1492922571     16.2838437976     286.6270  
  2025322205923     48.1492917165     16.2838443722     287.0627  
  2025323203540     48.1492922225     16.2838446130     286.7583  
  2025324091707     48.1492910139     16.2838430433     286.9125  
  2025327220019     48.1492924369     16.2838438271     286.7396  
  2025330191355     48.1492919858     16.2838448611     286.8052  
  average     48.1492919387     16.2838440857     286.817   
N: 48 8 57.45097  E: 16 17 1.83870  H: 286.817 m 
X: 4092523.2481   Y: 1195484.9891   Z: 4728181.4834

If I compare this result with the result of “averaging” then there is a gap of about 47 cm in direction 156 deg South-Southeast (SSE)

This is the result as graph

gnss_position_gpsrinex

Now using the ETRF/ITRF Coordinate Transformation Tool ECTT to convert from ITRF2020 ( over ITRF2000 ) to ETRF2000 for epoche 2026.0 I get

4092523.9026   1195484.3949   4728181.0565
48.1492862849  16.2838339544  286.8070
48 8 57.43062  16 17 1.80223

A commandline tool to transform ecef wgs84 data.