Bernese GPS Software Version 5.0 - Bernese GNSS Software

20.4 Description of the Processing Examples
PID 223 CODXTR: Program CODXTR creates a summary from the output files written in
the CODSPP step. The file is listed in the processing summary. A high rms value
and/or a lot of outliers indicate a site with bad code tracking performance.
Note for processing your own data: Stations showing a large rms are detected and
listed in a deletion file (SPPyyssss.DEL in directory OUT). The rms threshold can be
adjusted in panel “CODXTR 2: Options”. Both code and phase observation files will be
added to that list. The script removes the observation files according to the deletion
list.
RXOBV3 runs in parallel only if option “Action if station not in abbreviation list” in panel
“RXOBV3 2: Input Options 1” is set to ERROR. Otherwise, all stations are processed in one
RXOBV3-run. This prevents problems when different RXOBV3 runs try to update the station
abbreviation table at the same time.
Further reading: Section 4.2: RINEX Observation Files (page 53), Section 4.2.3: Import to
Bernese (page 54), Section 6.3: Receiver Clock Synchronization and Preprocessing of Code
Observations (page 108), Section 19.5.4: Script Parameters and BPE Variables (page 394),
Section 19.5.2: Parallel Processing (page 391).
20.4.2.4 Form Baselines, Preprocess and Screen Phase Data, Save Cluster NEQ Files
This PCF section makes up the preprocessing step and is an essential part of the processing.
Single-difference files are created, cycle slips detected and repaired, and unreasonable
observations removed. A diligent preprocessing is crucial for GNSS processing and severely
influences the quality of obtainable results.
#
# Form baselines, preprocess and screen phase data, save cluster NEQ files
# ------------------------------------------------------------------------
301 SNGDIF R2S_GEN ANY 1 223
311 MAUPRPAP R2S_GEN ANY 1 301
312 MAUPRP_P R2S_GEN ANY 1 311
313 MPRXTR R2S_GEN ANY 1 312
321 GPSEDTAP R2S_GEN ANY 1 313
322 GPSEDT_P R2S_EDT ANY 1 321
331 GPSCHK R2S_GEN ANY 1 322
PID 301 SNGDIF: First this script deletes already existing single-difference observation files
for the current session to prevent a mix up in case of a reprocessing. Program SNGDIF
selects a complete set of independent baselines and creates phase single-difference
observation files. The adopted strategy for the selection process is OBS-MAX which
can be considered as standard for almost all applications.
PID 311 MAUPRPAP: Prepares the parallel run for program MAUPRP.
PID 312 MAUPRP P: MAUPRP preprocesses the phase single-difference files. Cycle slips are
detected and corrected. If the size of a cycle slip cannot reliably be determined, a new
ambiguity is set up. In addition, unpaired observations (i.e., only L1 or L2 at an epoch)
and observations gathered at very low elevation angles are flagged as unusable.
Bernese GPS Software Version 5.0 Page 441