Spectracom GSG-5 series, User Manual With Scpi Manual

Page: 365 / 378

6.6.1.5 Limitations
Communication over GPIB is not currently working for RSG commands – syn
chronization fails.
Communication over GPIB is not currently working for RSG commands – syn
chronization fails.
6.6.2 Trajectory FILE Format (.traj)
Files in the
.traj
file format can be created with the StudioView RSG Trajectory Editor, but
an RSG license is not required to use these commands in a file.
All positioning commands can be written to the file as:
SOURce:SCENario:POSition TIME,<decimal>,<decimal>,<decimal>
…
or, without the
SOURce:SCENario:
part as:
POSition TIME,<decimal>,<decimal>,<decimal>
…
In the trajectory file format TIME must be a decimal number.
The resolution of the time stamps is 0.1 seconds (100 ms).
6.6.3 Trajectory Two-Line Element Format (TLE)
The two-line element, or TLE trajectory format has been supported by GSG since 2016. Two-line
elements sets are used as a coordinate system, as utilized by State Vector descriptions of e.g.,
satellite positions and velocities.
While there is no editor for TLE- based trajectories in StudioView, you can select a TLE tra
jectory in a scenario, once you created it in a text editor.
The file extension must be
.tle
, and the file must contain 3 lines:
First line: Header <the satellite text name>
Second line: <data>
Third line: <data>
The format is standardized and follows the definition outlined here:
http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_
Help/tle_def.html
To use a TLE-based trajectory:
6.6 Programming
CHAPTER
6
•
User Manual GSG-5/6 Series Rev. 26
349