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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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9. Combination of Solutions<br />

Exceptions are on one hand the orbit parameters where a priori information is taken from<br />

auxiliary standard orbit and radiation pressure files (see Section 15.3.2) and on the other<br />

hand troposphere parameters. Troposphere parametersare, in fact, handled in a special way:<br />

If a troposphere file is specified in option “Troposphere estimates” in panel “ADDNEQ2 1: Input<br />

Files”, the troposphere parameters for stations contained in the normal equations for which<br />

values are found in the input file are fixed on the input values (i.e., transformed to the input<br />

values and then deleted). This option may, e.g., be used for fixing the troposphere delays for<br />

one station in a small network on a particular solution. Note, that if troposphere parameters<br />

are fixed for one session but not for the following session, troposphere parameters for this<br />

second session may be missing in the troposphere output file due to the elimination of the<br />

parameters at the session boundary.<br />

9.4.4 Pre-Elimination Options<br />

Pre-elimination of parameters was described in Section 7.5.5. It is activated by enabling the<br />

option “Parameter pre-elimination” in panel “ADDNEQ2 3.1: Options 1” (see Figure 9.6).<br />

Several generic pre-elimination options are available for each parameter supported by<br />

ADDNEQ2. They may be activated in panels “ADDNEQ2 7.1: Parameter Pre-Elimination” and<br />

“ADDNEQ2 7.2: Parameter Pre-Elimination” (see Figure 9.8).<br />

BEFORE STACKING: Parameters are pre-eliminated after reading of each individual input<br />

normal equation file and are not stacked. The parameters may be transformed to new<br />

Figure 9.8: Pre-elimination options in ADDNEQ2.<br />

Page 200 AIUB

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