Bernese GPS Software Version 5.0 - Bernese GNSS Software

20. Processing Examples
The RINEX navigation files are expected to be in the campaign’s ORX directory.
The BPE will stop with an error if one of the requested files is missing.
PID 002 COOVEL: The IGS00-coordinates for the stations are given for the epoch of
Jan. 1., 2000, 00:00:00 (see IGS 00.CRD in the STA-directory). They have to be propagated
to the epoch of the current session based on the IGS00-velocity field (see
IGS 00.VEL in STA-directory). This is carried out by program COOVEL. The resulting
coordinate file gets a session specific name ($A$YSS+0.CRD).
Note when processing your own data: If you want to use the coordinates from a previous
double-difference solution the corresponding result file already refers to the
correct epoch. Instead of executing program COOVEL, you can simply copy the file to
the name $A$YSS+0.CRD used for further processing in this PCF.
Further reading: Section 22.2: Overview of the Directory Structure (page 475), Section
10.6.7: Propagating Coordinates to Specific Epochs (page 237).
20.4.4.2 Prepare Pole and Orbit Information
The next section of the CLKDET.PCF performs some standard preparatory steps. In particular,
orbit and Earth orientation files are converted from foreign to Bernese formats. It is
very important that you always use orbits together with the corresponding pole information
to avoid inconsistencies.
#
# Prepare pole and orbit information
# ----------------------------------
101 POLUPD CLK_GEN ANY 1 001
111 PRETAB CLK_GEN ANY 1 101
112 ORBGEN CLK_GEN ANY 1 111
PID 101 POLUPD: Program POLUPD converts the pole file from IGS/IERS format to
Bernese format. This pole file will be used for all following processing steps where
Earth orientation parameters are necessary.
PID 111 PRETAB: The orbit files are available in the IGS orbit file format (sp3c) giving a
table of satellite positions in an Earth-fixed frame (IGS00). These positions have to
be converted into the inertial frame using the program PRETAB.
PID 112 ORBGEN: The tabular orbit file is used as input for the final orbit generation step
with ORBGEN. The result is a standard orbit file and a summary providing the quality
of the orbit fit. It is contained in the processing summary (CLKyyssss.PRC). When
relying on IGS products, the fit rms should be around 1 cm.
The orbit and Earth orientation files from this step are used throughout all further processing
steps. They will not be changed anymore.
Further reading: Section 4.4: Precise Orbit Files (page 66), Section 4.5: IGS and IERS Pole
Files (page 68), Chapter 5: Preparation of Earth Orientation, GNSS Orbit, and Satellite
Clock Information (page 83).
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