Bernese GPS Software Version 5.0 - Bernese GNSS Software

20. Processing Examples
20.4.1.4 Compute PPP solutions station by station (including data screening)
This section of the PCF screens data and performs a precise point positioning using code
and phase measurements in a common analysis.
#
# Compute PPP solutions station by station (including data screening)
# -------------------------------------------------------------------
301 PPPEDTAP PPP_GEN ANY 1 233
302 PPPEDT_P PPP_GEN ANY 1 301
303 GPSXTR PPP_GEN ANY 1 302
311 PPPCHK PPP_AUX ANY 1 303
321 CRDMERGE PPP_AUX ANY 1 311
322 ADDNEQ2 PPP_AUX ANY 1 321
331 CCRNXC PPP_AUX ANY 1 311
PID 301 PPPEDTAP: This script prepares the parallel run of GPSEST.
PID 302 PPPEDT P: The following processing programs are called to perform a station by
station data cleaning process, and to compute the precise point positioning solution.
(1) GPSEST to generate a residual file for data screening, based on the ionospherefree
linear combination (L3). Normalized residuals are written, as elevation dependent
weighting of observations is applied.
(2) RESRMS to screen the residual file,
(3) SATMRK to mark identified outliers in the observation files. The actual observation
data remains in the files, the corresponding records are flagged as bad.
(4) GPSEST basically the same run as above, this time based on the cleaned observations.
The results are stored in station-wise result files for further use:
• station coordinates (extension CRD, in the STA directory of the campaign),
• differential code biases P1-C1 (extension DCB, in the ORB directory of the
campaign),
• receiver clock corrections (clock RINEX format with extension CLK, in the
OUT directory of the campaign), and
• normal equation file (extension NQ0, in the SOL directory of the campaign).
(5) ADDNEQ2 to generate PPP result files for each station in Bernese and external
formats, namely:
• station coordinates and SINEX (with extension SNX, in the SOL directory of
the campaign),
• station-specific troposphere parameters (extension TRP and troposphere
SINEX with extension TRO, in the ATM directory of the campaign),
Note that steps (1) to (3) run iteratively with different (decreasing) limits for outlier
detection in program RESRMS. Only results from the first run of GPSEST are retained
(EDFdddxxxx with ddd as day of year and xxxx as the 4-character station ID). Files
from the EDLdddxxxx series stem from GPSEST in step (4). The results in step (5) are
stored in files named PPPdddxxxx where PPP is the content of the V C BPE variable.
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