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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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16.4 Estimation of Phase Center Corrections<br />

Figure 16.6: Program input panels for the determination of the satellite antenna phase<br />

center variation in program <strong>GPS</strong>EST.<br />

satellite antenna offset can be computed it is recommended to subtract a fitted cos(n) function<br />

from the obtained satellite antenna pattern to get a “flat” pattern. In a second step<br />

these phase patterns may be introduced (and constrained) to estimate the corresponding<br />

satellite antenna offsets. In program <strong>GPS</strong>EST you may set up the satellite antenna parameters<br />

using the panels “<strong>GPS</strong>EST 6.10.1: <strong>GNSS</strong> Antenna Offsets 1” and “<strong>GPS</strong>EST 6.11.1: <strong>GNSS</strong><br />

Antenna PCV Patterns 1” (see Figure 16.5 and 16.6). It is a reasonable assumption that all<br />

satellites of one type (block) have the same antenna pattern. The <strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong><br />

supports grouping of individual satellites according to satellite blocks. Also an individual<br />

grouping of the satellites is possible:<br />

BLOCK/TYPE: In the listing below the group selection you may select for which satellite<br />

groups antenna parameters shall be estimated.<br />

MANUAL: Additional panels “<strong>GPS</strong>EST 6.10.3: <strong>GNSS</strong> Antenna Offsets 3” or “<strong>GPS</strong>EST 6.11.2: <strong>GNSS</strong><br />

Antenna PCV Patterns 2” allow to group the satellites manually.<br />

The grouping is possible for satellite antenna offsets as well as for satellite antenna phase<br />

center variations. Both have to be equal for offsets and patterns if you set-up both values in<br />

one <strong>GPS</strong>EST run and store a normal equation file. Normal equation files containing satellite<br />

antenna offsets and patterns can be processed with ADDNEQ2. It is currently not possible<br />

to apply new a priori values for satellite antenna parameters with program ADDNEQ2. To<br />

introduce new a priori values you have to start with program <strong>GPS</strong>EST. All normal equation<br />

files that are stacked together in ADDNEQ2 should be computed with the same a priori<br />

satellite antenna model and the same grouping of the satellites.<br />

<strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong> <strong>Version</strong> <strong>5.0</strong> Page 345

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