Bernese GPS Software Version 5.0 - Bernese GNSS Software

9. Combination of Solutions
Table 9.1: Parameter-specific identification strings in ADDNEQ2 output file.
Grep String Parameter Description
#CRD Station coordinates
#TRP Site specific troposphere parameters
#GIM Global ionosphere map parameters
#DCB Differential code bias parameters
#GCC Geocenter coordinates
#ERP Earth orientation parameters
#ORB Orbit parameters
#SORB Stochastic orbit parameters
#SAO Satellite antenna offset parameters
#SAP Satellite antenna phase pattern parameters
The results part starts with a list of numbers of parameters, detailing for each parameter
type the number of explicitly and implicitly adjusted parameters including information
about pre-elimination type. The number of deleted as well as of singular parameters are
listed separately. The a posteriori RMS of unit weight is given in units of the L1 phase
observable and should be in the order of 1-2 mm and 2-3 mm if the input normal equations
were generated with and without elevation dependent weighting, respectively.
Results for all estimated parameters are provided in tables in a generic format including
parameter description, estimated correction, estimated value, RMS error, a priori value,
and time interval of validity (for constant parameters) or parameter epoch (for time dependent
parameters). With the option “Provide extended output wrt estimated parameters” in panel
“ADDNEQ2 3.2: Options 2” (see Figure 9.7) enabled additional columns are added containing
the mean epoch in modified Julian date, parameter number, and a string characterizing
the parameter which facilitates the extraction of the information (e.g., using a simple grep
command on UNIX platforms). Table 9.1 list these identification strings.
The tables give information on the actually estimated parameters. Since, e.g., site velocities
are parameterized by two coordinate sets at different epochs, the tables contain the information
related to these two parameter sets if estimation of velocities is enabled. For coordinate,
velocity, troposphere, and global ionosphere parameters additional sections provide output
similar to that of GPSEST including, e.g., station coordinate corrections in north, east, up,
and error ellipsoid information, but also site velocity estimations (see Section 10.3.1), or
tilting angle information for tropospheric gradient parameters.
Program GPSXTR may be used to extract information from ADDNEQ2 program output files
and to write an “Output summary”, a “GIM summary”, a “Campaign summary”, and a “Weekly
summary”. See Section 7.8.2 for more details.
9.4.8 Writing of Normal Equations by GPSEST and ADDNEQ2
Let us add a few remarks concerning writing of normal equation files by GPSEST and
ADDNEQ2:
• Do not fix coordinates in GPSEST or ADDNEQ2 when writing normal equation files
because coordinates for fixed sites are removed from the normal equation. Constrain
the station coordinates (using, e.g., an a priori sigma of 0.0001 m) instead.
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