Bernese GPS Software Version 5.0 - Bernese GNSS Software

10. Station Coordinates and Velocities
Table 10.2: List of programs used for coordinate/velocity estimation.
Program Input data type Location
Station Coordinates
CODSPP code, zero-difference ”Menu>Processing>Code-based clock synchronization”
MAUPRP phase, epoch-difference ”Menu>Processing>Phase preprocessing”
GPSEST code and/or phase, zero- or ”Menu>Processing>Parameter estimation”
double-difference
ADDNEQ2 combination on NEQ level ”Menu>Processing>Normal equation stacking”
Station Velocities
ADDNEQ2 combination on NEQ level ”Menu>Processing>Normal equation stacking”
to generate good a priori coordinates – as recommended in Section 3.5 – these preliminary
coordinate results are not needed anymore. Otherwise, they may be used as a priori
information in subsequent analysis steps.
Although GPSEST is still the main parameter estimation program in the Bernese GPS
Software. It is gradually superseded by ADDNEQ2 when it comes to coordinate estimation.
If final coordinate results are to be estimated, GPSEST is mainly used to create a normal
equation file. The geodetic datum is then defined in a separate step with ADDNEQ2. Multisession
solutions and velocity estimation are only possible with ADDNEQ2, anyhow.
The program panels dedicated to datum definition are very similar in programs GPSEST
and ADDNEQ2. The only differences are the minimum constraint solution and the velocity
related panel, which both are not available in GPSEST. Figure 10.1 shows the corresponding
ADDNEQ2 panel.
The options let you select one of the datum definition types described in Section 10.2.2 and if
necessary the corresponding constraints or minimum constraint conditions. The comboboxes
next to each datum definition type offer several possibilities for reference site selection
(stations to which the datum definition should apply). The FIRST, LAST, or ALL stations
may be selected without any additional user interaction. The other three possibilities need
further specifications in a subsequent panel. Reference sites can be picked by hand from a
list of stations (MANUAL), taken from a station selection or sigma file (FROM FILE), or from
a coordinate file depending on the corresponding flags (WITH FLAG). If coordinates are to
be constrained FROM FILE, not only the list of reference sites but also the a priori sigmas are
taken from that file. Sections 22.8.13 and 22.8.12 provide more details on station selection
and station sigma files. Please note that the afore mentioned datum definition options do
not apply for kinematic stations. The datum may be analogously defined for velocities in
program ADDNEQ2.
The a priori coordinates of the reference sites should always refer to the current epoch of
the processed session. If the reference coordinates refer to a different epoch they must be
extrapolated accordingly with program COOVEL before being introduced in GPSEST. For
program ADDNEQ2 this is not necessary, provided that an a priori velocity file is specified
in the input panel. In that case ADDNEQ2 internally propagates the coordinates before the
normal equation system is solved.
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