Processing Method

Differential GNSS

Differential processing can be selected if base station(s) have been added to the project. This method of processing provides access to ARTK, where carrier phase ambiguities may be fixed for high accuracy applications.

Precise Point Positioning (PPP)

PPP is an autonomous positioning method where data from only the remote receiver is used. If base station data has been added to the project, it will not be used when processing PPP. By design, both differential and PPP trajectories can be processed within the same project without over-writing each other.

The PPP processor requires dual frequency data, single frequency PPP is not supported.

Upon selecting Process, pre-processing checks test whether precise ephemeris and clock data have been added to the project, which are required to remove meter-level error sources. If the project contains only broadcast orbit and clock corrections from the combined ephemeris data (.EPP files), the pre-processing checks will warn of this through the No Precise Files pre-processing warning.

If it is your intention to process a PPP trajectory without applying any precise corrections, you can do so by deselecting the Try to fix option at the bottom of the PPP Pre-processing dialog and then select Continue. Users may wish to do this as a quick check on the quantity and quality of collected data, prior to precise ephemeris files or base station data becoming available.

If the Try to fix option is selected when you select Continue, the Download Service Utility is called to automatically download the best available source of precise and ephemeris data given the detected constellations in the remote data file.

PPP With AR Enabled

PPP-AR is an enhanced version of PPP that utilizes the TerraStar C-PRO corrections for faster convergence times with ambiguity resolution. Any survey collected after July 4th, 2019 can benefit from the faster convergence. With the faster convergence times you can use shorter surveys to obtain similar or better performance than our legacy PPP filter, making PPP a more viable option.

PPP-AR can only be used with NovAtel receivers and an NRT subscription.