Bernese GPS Software Version 5.0 - Bernese GNSS Software

7. Parameter Estimation
In a successful run of the program, an a posteriori sigma of unit weight of the order of
1.0−1.5 mm with elevation-dependent weighting and 2.0−2.5 mm without elevation dependent
weighting is expected for phase processing. For code observations a similar sigma is
expected (because converted to L1 phase) while for smoothed code a sigma of 0.2−0.3 mm
should result.
Additional information may be activated in panel “GPSEST 3.3: Extended Printing Options”.
This panel gets active if YES is selected for option “Selection of printing options” in panel
“GPSEST 3.2: General Options 2”. If AS IS is selected instead, the output is written according
to the options selected in panel “GPSEST 3.3”, but the panel is not displayed. If NO is selected
no special output is printed. The special output refers to additional output concerning a
priori information or to output that further details the estimated parameters. They include
(see “GPSEST 3.3” and corresponding on-line help for detailed information):
• list of observations in the files and of observations used for processing,
• table of satellite elevations as a function of time for the first station,
• histogram of observations by elevation angle bin and by nadir angle bin,
• detailed list of set up parameters with their characterization,
• Helmert transformation parameters of the estimated station coordinates with respect
to the a priori coordinates (note: this not a minimum constraint solution as it is
available in ADDNEQ2),
• unresolved ambiguities after each iteration step,
• list of resolved ambiguities from observation files,
• general constants, antenna phase center offsets, coefficients of ionosphere models used,
• station eccentricities, receiver and antenna names and numbers, as well as
• receiver synchronization errors.
The option “Suppression of output concerning epoch parameters” allows to suppress the extended
output concerning epoch parameters such as kinematic coordinates or clock corrections.
If no corresponding output files and no residual file are written the option suppresses, in
addition, the back-substitution of epoch parameters to save computing time.
7.8.2 The Output Extraction Program GPSXTR
Program GPSXTR may be used to extract information from the GPSEST (or also ADDNEQ2)
output files and generate different types of summary files (see on-line help for more information
as well as for output examples):
• The “Output summary” provides a standard extraction containing a posteriori RMS,
number of input files, observations, and parameters, and the maximum correction in
semimajor axis if satellite orbit parameters are estimated.
• The “Coordinate summary” provides a processing quality check for baselines processed
independently with program GPSEST. It specifies for each baseline the number of
observations and of ambiguities, the a posteriori RMS, the length of the baseline as
well as the correction of the baseline coordinates in height, north, east, and length.
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