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Bernese GPS Software Version 5.0 - Bernese GNSS Software

Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22. Data Structure<br />

22.10.5 Normal Equation Rescaling File<br />

Type: ASCII<br />

Directory: Campaign-specific directory OUT.<br />

Extension: WGT<br />

Content: Normal equations rescaling information and a priori Helmert transformation<br />

parameters.<br />

Created by: User-defined.<br />

Used by: ADDNEQ2 to rescale normal equations for the computation of combined solutions.<br />

Example: Figure 22.55 and ${X}/DOC/EXAMPLE.WGT.<br />

Rescaling of normal equations for the combination of solutions is usually NOT necessary, if<br />

you combine your own normal equations. If you combine solutions from different processing<br />

centers (using different program systems) rescaling the associated variance-covariance<br />

matrices may be mandatory. The example in Figure 22.55 shows the rescaling values for<br />

different European Analysis Centers (all using <strong>Bernese</strong>) [Brockmann and Gurtner, 1996],<br />

which were computed using the information on the sampling rate, only.<br />

Currently no program is available in the <strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong>, <strong>Version</strong> <strong>5.0</strong> , which allows to<br />

compute rescaling factors. For a future version the generation of an output file of estimated<br />

rescaling factors using the methods of variance-covariance component estimation is foreseen.<br />

Some further comments:<br />

• The mentioned rescaling values refer to the normal equations (< 1 means downweighting,<br />

0.25, e.g., means down-weighting by a factor of 2: 1/2 2 = 1/4 = 0.25).<br />

• You may specify a rescaling value for each file separately by specifying FILE NAMEs.<br />

• You may also specify a GRP name (please leave the FILE NAME blank in this case).<br />

The GRP name specified here is compared to the normal equation input filenames<br />

(first 3 characters disregarding the directory path). That makes it possible to handle<br />

files in groups.<br />

• The NUM column is not used, at present.<br />

• The information of the HELMERT PAR may be used to apply a priori Helmert transformations<br />

for coordiantes in individual normal equations before stacking.<br />

COVARIANCE COMPONENTS<br />

COVARIANCE COMPONENT ESTIMATION AND HELMERT PARAMETERS<br />

--------------------------------------------------------------------------------<br />

NUM VALUE FILENAME GRP HELMERT PAR. HELMERT VALUES ....<br />

*** ******************* ******************************** *** * * * * * * * ******** ******** ..<br />

1 1.0000000000000E+00 BEK 0 0 0 0 0 0 0 0.0000 0.0000 ..<br />

2 1.0000000000000E+00 COE 0 0 0 0 0 0 0 0.0000 0.0000 ..<br />

3 0.8000000000000E+00 DEO 0 0 0 0 0 0 0 0.0000 0.0000 ..<br />

4 1.0000000000000E+00 ROB 0 0 0 0 0 0 0 0.0000 0.0000 ..<br />

5 1.0000000000000E+00 WUT 0 0 0 0 0 0 0 0.0000 0.0000 ..<br />

Figure 22.55: Normal equation rescaling (WGT) file.<br />

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