Bernese GPS Software Version 5.0 - Bernese GNSS Software

22. Data Structure
22.4.4 Antenna Phase Center Offsets and Patterns
Type: ASCII
Directory: ${X}/GEN (UNIX) or %X%\GEN (Windows) for the input file, campaignspecific
directory OUT for output files.
Extension: Variable.
Content: Antenna phase center offsets and variations for receiver and satellite antennas.
Created by: User-defined for input, GPSEST (”Menu>Processing>Parameter estimation”) for estimation,
PHCCNV (”Menu>Conversion>ANTEX to Bernese format”) for output. Available
from BSW aftp server.
Used by: All programs processing GNSS observations.
Example: Figures 22.5 and 22.6 show an example using format 2 (formats are explained
at the bottom of Figure 22.5). An update version of the file PHAS COD.I05 is
available at the anonymous BSW ftp area (see Section 4.12).
Remarks:
• Use IGS values in order to assure consistency with the IGS products.
• Values may be imported from ANTEX using PHCCNV (”Menu>Conversion>ANTEX to Bernese
format”).
• Elevation-dependent antenna phase center corrections are of importance for the combination
of different antenna pairs in a network. Between Trimble and Dorne Margolin
antennas the effect of non-modeled elevation-dependent variations may reach more
than 10 cm in station height [Rothacher et al., 1996]. At present (January 2007) the
recommended values to be used in the processing is the absolute model IGS05. These
values were obtained from robot calibrations.
• The Bernese PCV file contains patterns for the GNSS satellites (which are zero for
relative phase patterns). The patterns have to be named with the sensor name that is
specified in the second section in the satellite information file (see Section 22.4.5), e.g.,
MW TRANSM IIA 032 for the Block IIA satellite with PRN 1. Satellite patterns,
even if zero, have to be present in the file for Version 5.0 .
• The IGS has investigated the effect of using absolute antenna phase patterns. For
large networks such patterns require the use of block-specific satellite antenna phase
patterns and satellite specific antenna offsets [Schmid and Rothacher, 2003]. Starting
from GPS week 1400 the IGS has switched to the absolute antenna model IGS05.
• Starting from GPS week 1017 (July 1999), a new IGS naming convention for receiver
and antenna names was introduced. A list of the currently valid receiver and antenna
names may be found at ftp://ftp.igs.org/igscb/station/general/.
• It is possible to define different phase center locations for each individual antenna by
using antenna numbers in the observation files.
• Note the different formats: “0” means no elevation dependent corrections, “1” means
elevation dependent values given to the right of the offset values, and “2” means
phase center maps (grid) or spherical harmonics available. An example of elevationand
azimuth-dependent grid information is shown in Figure 22.6.
• The order of the antennas in the first part and in the second part have to be the same.
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