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GPS (Global Positioning System) - Satellite based
Positioning
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AWE Communications offers
a GPS navigation module as extension for
the ProMan software tool.
The GPS technology is pre-defined in the navigation module - but the
module can also be used for the European Galileo
navigation
system (or further systems), as the number of satellites as well as
their
orbits can be defined by the user.
Evaluations
for a long time period can also be made (with discrete time intervals).
ProMan predicts the following outputs for each pixel (location) in the
prediction
area:
These
values can be predicted for arbitrary time and date combinations and
are
exported in ASCII files for further processing by the user. So the user has the
option
to use this data for his prediction of the localization accuracy with
GPS
or A-GPS.
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Features of GPS / Navigation Module
The module needs the following input from the user:
- Time
and Date of analysis (as the
locations of the satellites are time dependent, see below)
- One or multiple measurement points (locations) on
the globe (either single point or rectangular area), defined in WGS 84
coordinate datum and defined by their
- UTM coordinates (longitude, latitude,
elevation)
- UTM zone
- At least one of the following databases
Computed by the module (generally):
- Locations of all satellites (in UTM zone of the above
mentioned measurement points)
Computed by the module (individually for each measurement point):
- Elevation of satellites relative to measurement
point
- Number
of visible satellites (i.e.
LOS/NLOS
information for each satellite)
- Signal
level received in the GPS receiver for each satellite
- Propagation Paths (multipath
profile) for each satelllite individually including
- path
loss
- delay
- phase
- angle
of arrival
- Doppler
shift
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GPS Satellites - Time Dependent Transmitter
Locations
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The
location of
the GPS satellites are depending on the time.
Therefore it is very often
important to analyze the GPS coverage for a given location on the globe
over the
time. ProMan offers the
possibility to define a time (UTC time) and a location on the globe
(coordinates of location in an arbitrary UTM zone, based on WGS 84
coordinate datum) - and then the location of the satellites relative to
this location are computed by ProMan automatically.
The user has to provide the GPS orbit data information. This can be
done either via
- Almanac
data sets Click here to
get the data. Data is weekly updated.
- TLE data
sets Click here to
get the data. Data is weekly updated.
After
downloading the data set for the week of interest, the user can compute
the time-dependent locations of the GPS satellites for all locations on
the globe.
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