GNSS Post processing Tools

• GNSS Post processing has tools to manage:

  

  • The coordinate system of the project.

  • The antenna calibration sets.

  • The precise ephemeris.

Coordinate system

• Coordinate system tool allows to define the coordinate system of the project.

• Click Coordinate system.

  

• Refer to Coordinate system.

Antenna manager

• Antenna manager allows to manage the phase center calibration from different agencies.

• Click Antenna manager.

  

• This command opens a new window.

  

• The table shows the available calibration for GNSS antennas from different brands.

It is usually not necessary to perform any operation on this database, since all calibrations are preloaded.

• In the table there are information on the calibration file.

  • IGS name: the IGS name of the antenna point.

  • Calibration data: the date of the calibration for selected antenna from a specific agency.

  • GPS/GLONASS/Galileo/Beidou/QZSS/SBAS: shows if calibration is specific for a constellation.

  • Calibration set: the agency for the calibration.

• Click Group antennas to group the antennas by calibration agency.

  

• On the bottom bar there are some commands to manage the calibrations:

  • Import ATX : allows to import ATX files. These files are available from various agencies including the International GNSS Service (IGS) or National Geodetic Survey (NGS) and have a list of antenna types by manufacturer with their respective offsets and eccentricities.

  • Add: to manually create an antenna entering the phase center offsets and the antenna name.

  • Delete : to delete an antenna calibration.

  • Copy to project: to copy selected antenna models to the current project, within the Antennas page.

Precise ephemeris

The Precise ephemeris command allows to import and use precise ephemeris in SP3-P format to be used in the GNSS processing. The SP3-P format is an internationally accepted standard ASCII format for precise ephemeris.

There are several services that provide precise ephemeris data, like for example:

• IGN Global Data Center.

• IGS International GPS Service for Geodynamics.

• Click Precise ephemeris.

  

• This command opens a new window.

  

• The table shows the list of available precise ephemeris that was previously imported.

  • Import: to import a file in SP3-P format.

  • Delete: to delete imported file.