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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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6. Data Preprocessing<br />

6.1 Overview<br />

In this chapter the first group of processing programs of the <strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong> is<br />

discussed. These programs do not produce final results but check and prepare the data for<br />

the main estimation program (<strong>GPS</strong>EST). The programs are<br />

Program RNXSMT (”Menu>RINEX>RINEX utilities>Clean/smooth observation files”) detects cycle slips<br />

and outliers on RINEX level using simultaneous code and phase observations from<br />

both frequencies to each satellite. Code observations are smoothed using the phase<br />

measurements.<br />

Program CODSPP (”Menu>Processing>Code-based clock synchronization”) computes the corrections<br />

for synchronizing the receiver clocks with respect to <strong>GPS</strong> time. Only code observations<br />

are used for this step. The program may be used to screen code data, too.<br />

Program SNGDIF (”Menu>Processing>Baseline file creation”) forms baselines from zero-difference<br />

observation files. The output are single-difference observation files.<br />

Program MAUPRP (”Menu>Processing>Phase preprocessing”) detects and resolves cycle slips, removes<br />

outliers, and adds multiple ambiguities for the phase observation files. It works<br />

with station observation files (zero-difference mode) and with baseline observation<br />

files (single-difference mode).<br />

Program RESRMS (”Menu>Service>Residual files>Generate residual statistics”) screens the post-fit residuals<br />

produced in a <strong>GPS</strong>EST run to identify outliers.<br />

Program RESCHK (”Menu>Service>Automated processing>Detect misbehaving stations/satellites”) is a tool<br />

to detect misbehaving stations and satellites by analyzing the summary file of the<br />

program RESRMS. This program is mainly intended for automated processing.<br />

Program SATMRK (”Menu>Service><strong>Bernese</strong> observation files>Mark/delete observations”) marks the observations<br />

identified as outliers by RESRMS in the <strong>Bernese</strong> observation files.<br />

Figure 6.1 shows the different possibilities to preprocess the code and phase observation files<br />

available in the <strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong>, <strong>Version</strong> <strong>5.0</strong> . The usual way for a double-difference<br />

solution is to perform the receiver clock synchronization (program CODSPP, description<br />

in Section 6.3), form baselines from phase observation files (program SNGDIF, description<br />

<strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong> <strong>Version</strong> <strong>5.0</strong> Page 101

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