Bernese GPS Software Version 5.0 - Bernese GNSS Software

20.4 Description of the Processing Examples
Stations for which no ocean loading entries were found in the respective file entail
warnings in the GPSEST error message file. These are extracted and reported in the
processing summary. The ocean loading tables should be updated if such warnings
appear (see Section 22.8.11).
In addition, the processing summary comprises information on receiver tracking technology
as extracted from the GPSEST output files.
PID 303 GPSXTR: Output extractor for program GPSEST, producing an overview of the
PPP solution, and the data cleaning. These extracts are included in the processing
summary. The a posteriori rms error should be below 1.2 mm for well performing
stations. Higher values may point out preprocessing problems or bad data quality.
PID 311 PPPCHK: This script calls several processing programs sequentially:
(1) RESRMS produces a residual statistics based on the files generated in step
PID 302 before screening. L3 is analyzed.
(2) RESRMS produces a residual statistics based on the screened files from PID 302
(last GPSEST run in step (4)).
(3) RESCHK creates a residual screening statistics.
The summaries created by RESRMS and RESCHK are included in the processing summary.
Suspicious stations or satellites may show large residuals or a very high percentage
of deleted data.
PID 321 CRDMERGE: The station specific coordinate files from PID 302 are merged into
one coordinate file.
PID 322 ADDNEQ2: ADDNEQ2 is used to write a single SINEX and a combined normal
equation file containing all stations based on the normal equation files generated in
PID 302. The troposphere parameters are pre-eliminated in this step. The SINEX
sections related to station information and the estimated coordinates are listed in the
processing summary.
PID 331 CCRNXC: The station specific clock RINEX files are combined to obtain one
RINEX clock file. The processing summary contains the resulting CCRNXC output
providing information on the selected reference clock and the performance of a polynomial
fit of the estimated clock corrections.
At this point, the PPP processing is basically finished. What follows now are the optional
propagation of coordinates to the reference epoch using the NNR-NUVEL velocity model
and the estimation of ionosphere models and DCBs.
Further reading: Chapter 7: Parameter Estimation (page 139), Section 7.4.4: Real and Normalized
Residuals (page 144), Section 6.6: Screening of Post-Fit Residuals (page 130), Section
6.7: Marking of Observations (page 136), Chaper 10: Station Coordinates and Velocities
(page 211), Section 10.5: Precise Point Positioning (page 231), Chaper 11: Troposphere
Modeling and Estimation (page 239), Section 13.3.3: Verification of the Receiver Tracking
Technology (page 285), Chaper 9: Combination of Solutions (page 183), Section 14.3: Clock
RINEX Utility in Bernese GPS Software (page 298).
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