Bernese GPS Software Version 5.0 - Bernese GNSS Software

5. Preparation of Earth Orientation, GNSS Orbit, and Satellite Clock Information
Table 5.3: Input file selections for the important orbit models.
Model Old Model Model B Model D
Orbit model flag 0 B D
Planetary ephemerides DE200 DE200
Geopotential model GEMT3. JGM3. EGM96.
Ocean tides file OT CSRC OT CSRC
The gravity field recommended by the IERS Conventions 2003 is EGM96 [McCarthy and
Petit, 2004]. For GNSS satellites a maximum degree and order of 12 is sufficient (panel
“ORBGEN 3.1: Options”, option “Earth potential degree”). For interpolating GNSS orbits at the
one day level even a maximum degree and order of 8 is appropriate. If processing data from
LEOs, however, you may use one of the gravity models based on the new gravity satellite
missions such as EIGEN2 and select a degree and order exceeding 70.
The a priori radiation pressure model is defined by the radiation pressure file descriptor
in the header of the satellite information file (e.g., ${X}/GEN/SATELLIT.I05, see Section
22.4.5). The first character of this indicator is used to specify the a priori model. In
general the ROCK4/42 model [Fliegel et al., 1992] is used by specifying the corresponding
file descriptor T950101. Alternatively, the model developed by [Springer et al., 1999] may
be used, indicated by the descriptor C980101.
Figure 5.5: Selection of radiation pressure parameters in program ORBGEN.
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