Orolia GSG-5 Series, User Manual With Scpi Manual, Page: 147 / 392

The attitude of the vehicle in motion can affect signal reception due to on-vehicle
blockages and antenna affects.
The acceleration/jerk in the context of position and attitude can have a significant
effect on signal reception.
Ultimately, the objective of any test is to determine how the receiver/the system under
test responds when subjected to the above-mentioned control factors and noises.
Note: For additional information on trajectories, see "Trajectories" on
page 43 .
How to Obtain a Trajectory?
There are different ways to generate a trajectory:
a.
Authentic NMEA data logged during a real-world drive along the trajectory route
under live sky conditions (see
"Record and Playback" on page 163 )
b. StudioView's Trajectory Editor , which can be used to manually create a trajectory
as a sequence of points on Google Maps.
c.
StudioView RSG Trajectory Editor , which can be used to describe a motion-
based trajectory (proprietary format) (Option-RSG is NOT required to use this
editor)
d. Real-time motion simulator input; (Option-RSG IS required to input the data in
realtime)
e.
Several GSG models are shipped with pre-installed circle and 3GPP trajectories.
R e a l i s t i c T r a j e c t o r i e s
Trajectories generated by means other than (a.) should always realistically reflect the dynamic
capabilities of the type of vehicle in motion e.g., car, aircraft, ship. To this end, Orolia recom-
mends using ‘smooth’ methods to describe the movements, i.e. changes in acceleration, head-
ing or altitude should be gradual, not sudden or ‘hard’.
When using coordinates to describe a trajectory, the data must be provided in 10 Hz format and
must not contain sudden changes in speed, direction or elevation; GNSS receivers generally
are very sensitive to G-force and unrealistic movements will result in the receiver losing track
of the signals.
Supported Trajectory Formats
GSG accepts trajectory data in the
.nmea
and
.traj
formats, while StudioView also
accepts other formats, which can then be converted to NMEA for use in the GSG.
4.9 Studioview Tasks
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