[IGSMAIL-7383] TUM MGEX update

[Inga Selmke]

Dear colleagues,

a short update to IGSMAIL-7377:

As already announced the TUM MGEX orbits were replaced by an updated 
product starting on November 30, 2016. The orbits are generated within 
the CODE (Center for Orbit Determination in Europe) at Technical 
University of Munich using the development version 5.3 of the Bernese 
GNSS Software. The general processing approach remains unchanged. The 
submitted orbits are the middle day of a 5-day arc, computed in 
undifferenced mode.
Improvements include
- attitude modelling: Dynamical yaw steering for Galileo [1], QZSS orbit 
normal mode for beta angles below 20deg
- radiation pressure: a priori boxwing model [2]  together with 
traditional 5 parameter CODE model.
- number of stations doubled (ca. 70 stations)

[1] Ebert K., Oesterlin W.; Astrium GmbH. *Dynamic yaw steering method 
for spacecraft.* European patent specification EP 1 526 072 B1. 2008
[2] Montenbruck O., Steigenberger P., Hugentobler U. (2014): *Enhanced 
solar radiation pressure modeling for Galileo satellites*, J Geod (2015) 
89:283-297, doi: 10.1007/s00190-014-0774-0

Kind regards,
Inga Selmke

M.Sc. Inga Selmke
Forschungseinrichtung Satellitengeodaesie
Technische Universitaet Muenchen
Arcisstrasse 21
D-80333 Muenchen
Tel: (+49) 89 / 289 231 93
Fax: (+49) 89 / 289 231 87

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