Bernese GPS Software Version 5.0 - Bernese GNSS Software

22. Data Structure
22.4.5 Satellite Information File
Type: ASCII
Directory: ${X}/GEN (UNIX) or %X%\GEN (Windows)
Extension: Variable.
Content: Satellite information (block, sensor offsets, masses, etc.) for GPS (PRN <
100), GLONASS (100 < PRN < 200), geostationary (300 < PRN < 400),
and LEOs (PRN > 900). For Galileo 200 < PRN < 300 is reserved.
Created by: User-defined. Available from BSW aftp server.
Used by: Most orbit and processing programs.
Example: Figure 22.7. An update version of the file SATELLIT.I05 is available at the
anonymous BSW ftp area (see Section 4.12)
Remark:
• The file contains all satellite information necessary for GNSS data processing. All
information is annotated with a time window which allows it to include the entire
history of the satellite constellation in the same file. The information is contained in
two data sections (PART 1 and PART 2). A third section (PART 3) gives information
on the different flags and parameters, provides internet addresses of related sites, and
contains a change log.
• In PART 1: PHYSICAL SATELLITE PARAMETERS the satellites are listed with block
numbers, COSPAR numbers, attitude flag, time window, (launch and decommissioning)
masses, area-to-mass ratio (not used), a priori radiation pressure model number,
a priori coefficients (corrections to the a priori model) for the direct radiation pressure
(DP0), for the y-bias (P2), and for the direction perpendicular to the two (P3) in m/s 2 .
Not used are the air drag model specification, and the air drag coefficient. The last
column (IFRQ) gives the frequency number for GLONASS.
• PART 2: ON-BOARD SENSORS contains for each satellite the sensor name(s), time window
(which needs to be the same as in the first section!) sensor offsets (for microwave
antenna or SLR reflector), and sensor boresight and azimuth unit vectors w.r.t. a
satellite-fixed coordinate system. The sensor name has to be defined in the antenna
phase center file.
• The satellite information file contains the information concerning the radiation pressure
model to be used. We recommend to use the Rock T model as a priori model
for GPS, even if the differences to the other models is negligible for the creation of
the standard orbits from tabular / precise orbits. No a priori model is available for
GLONASS.
• If a new satellite is launched the information for this new satellite has to be included
into the file. A new line has to be added in both parts and time window, block
number, antenna offsets, etc. has to be introduced correctly. You may copy the lines
from another satellite and adapt it accordingly. Pay attention in particular to the
block and the antenna offsets. Check that no time window of an inactive satellite
with the same PRN number is overlapping with that of the new satellite. An up-todate
SATELLIT.xxx file may be downloaded from the anonymous BSWUSER ftp area
(http://www.aiub.unibe.ch/download/BSWUSER50/, see Section 4.12).
• Observations without satellite information for the specific epochs are removed by
programs RXOBV3 and RNXSMT. A corresponding warning message is issued.
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