Projects:
Definition & Development
of Galileo
Signal Structure
Galileo Test
Bed GATE
ESA Galileo
Test Bed GSTB_V1
GNSS Software
Simulation
C-Nav
Study |
ESA Galileo Testbed V1 - Galileo Tropospheric Correction
Model
One part
of the Galileo System Testbed (GSTB) implemented by the European Space Agency
(ESA) is the Stand-Alone Test Case "Atmospheric Performance Assessment Facility"
(APAF). Within this test case the Institute of Geodesy and Navigation deals
with the tropospheric effects on the GNSS signals.
The objectives
of the tropospheric modelling efforts are the development and evaluation
of tropospheric correction approaches mainly based on the use of Numerical
Weather Fields (NWM).
The NWM of NOAA/NCEP
Depending
on the infrastructure of the Galileo user mainly three different types of
users are derived in the Galileo System Test Bed:
-
Group
1: The first group has direct access to NWM; these are in general the
OSPF (Orbitography and Synchronisation Processing Facility, i.e. Galileo
ground segment) stations, for instance. Tropospheric total delays can directly
be calculated with help of meteorological data extracted out of the NWM.
-
Group
2: The second user group does not have access to NWM, but is able to
retrieve surface meteorological measurements. So they can use improved
tropospheric correction models.
-
Group
3: The third user group does not have any access to meteorological data.
They have to use a "blind model", i.e. meteorological input parameters of
the tropospheric correction model are modelled by a harmonic function.
See for
more details of tropospheric correction models and their improvement as well
as the derivation of "blind" meteorological
parameters: Tropospheric Correction Models
Publications
can be found in our
Research
Database.
Point
of contact: Eva Krueger,
Dr. T.
Schüler |
