Bernese GPS Software Version 5.0 - Bernese GNSS Software

9.4 The Program ADDNEQ2
implemented for special applications and in general the field can be left blank to retain
the parameter offset from input normal equations. It is not recommended to change the
parameter offset in ADDNEQ2.
If a normal equation file written by GPSEST contains Earth orientation parameters it is
recommended to specify the parameter spacing even if it should remain the same. Specify,
e.g., 24 hours even if GPSEST wrote EOP parameters with a daily sampling. The reason is
that EOP are parameterized in GPSEST with offset and drift. A non-blank value for the EOP
sampling forces ADDNEQ2 to transform the parameterization to piece-wise linear. Otherwise
ADDNEQ2 leaves the parameterization unchanged and does not stack the parameters.
Detailed information on changes of parameter intervals is tabularized in the program output
under the title Change number of intervals.
9.4.6 Station Information File
Station-related information such as station names, equipment, or antenna eccentricities can
be changed using the station information file (see Section 22.8.3). If an antenna eccentricity
is modified the corresponding station coordinates are transformed accordingly and the
estimated coordinates refer to the new antenna position. Note that in case of changing the
antenna name the model for the antenna phase center center variations cannot be adapted.
Stacking may be suppressed for station coordinates (e.g., in case of anomalous behavior) by
marking the station as bad in the station information file. The coordinates for the marked
station will then be pre-eliminated without constraints before stacking for normal equation
files within the specified time interval. All parameters related to that station, e.g., troposphere
parameters, are pre-eliminated, too. Note, however, that the station parameters
remain implicitly within the normal equations. In case of serious problems a station may
have to be removed at observation level. In case of a jump in the coordinate time series (antenna
changes, earthquakes, etc.) the station may be renamed after the event. Coordinates
before and after the event will then not be stacked.
Coordinates and velocities of different stations may be constrained to the same values by
applying relative constraints to the respective parameter improvements. Note that, in order
to get the same estimates for the two stations, the corresponding a priori values have to be
the same.
For more details how to generate a multi-session solution we refer to Section 10.3.5.
9.4.7 Program Output
Like the output of program GPSEST the output file of program ADDNEQ2 contains in its
first part the a priori information documenting the input files and important options. For
each input normal equation file the validity interval, number of observations, and number of
parameters are tabulated. The number of explicit parameters is split up into the individual
parameter types. For each estimated parameter the important information such as a priori
constraints and change of parameterization (change of parameter spacing, see Section 9.4.5)
are listed.
Bernese GPS Software Version 5.0 Page 203