Bernese GPS Software Version 5.0 - Bernese GNSS Software

6. Data Preprocessing
6.1 Overview
In this chapter the first group of processing programs of the Bernese GPS Software is
discussed. These programs do not produce final results but check and prepare the data for
the main estimation program (GPSEST). The programs are
Program RNXSMT (”Menu>RINEX>RINEX utilities>Clean/smooth observation files”) detects cycle slips
and outliers on RINEX level using simultaneous code and phase observations from
both frequencies to each satellite. Code observations are smoothed using the phase
measurements.
Program CODSPP (”Menu>Processing>Code-based clock synchronization”) computes the corrections
for synchronizing the receiver clocks with respect to GPS time. Only code observations
are used for this step. The program may be used to screen code data, too.
Program SNGDIF (”Menu>Processing>Baseline file creation”) forms baselines from zero-difference
observation files. The output are single-difference observation files.
Program MAUPRP (”Menu>Processing>Phase preprocessing”) detects and resolves cycle slips, removes
outliers, and adds multiple ambiguities for the phase observation files. It works
with station observation files (zero-difference mode) and with baseline observation
files (single-difference mode).
Program RESRMS (”Menu>Service>Residual files>Generate residual statistics”) screens the post-fit residuals
produced in a GPSEST run to identify outliers.
Program RESCHK (”Menu>Service>Automated processing>Detect misbehaving stations/satellites”) is a tool
to detect misbehaving stations and satellites by analyzing the summary file of the
program RESRMS. This program is mainly intended for automated processing.
Program SATMRK (”Menu>Service>Bernese observation files>Mark/delete observations”) marks the observations
identified as outliers by RESRMS in the Bernese observation files.
Figure 6.1 shows the different possibilities to preprocess the code and phase observation files
available in the Bernese GPS Software, Version 5.0 . The usual way for a double-difference
solution is to perform the receiver clock synchronization (program CODSPP, description
in Section 6.3), form baselines from phase observation files (program SNGDIF, description
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