VLATI-TXT
VLATI-TXT is VLATI’s textual analysis program. It displays useful information about the spacecraft’s trajectory at the chosen step, like velocity and distance vectors.
Syntax:
VLATI-TXT [-h] [-f FRAME] [-s SHOW [SHOW ...]] trajectory_file velocity_file frame_iq
Command-Line Arguments
| Argument | Purpose | |
|---|---|---|
trajectory_file | Required | What file VLATI-TXT draws planetary and spacecraft positions from over time |
velocity_file | Required | What file VLATI-TXT draws planetary and spacecraft velocities from over time |
frame_iq | Required | The simulation frame to analyze |
-f/--frame | Optional | The coordinate origin |
-s/--show | Optional | Specific sections to show in the output |
If you input invalid variables into --show, the program will still run, displaying any valid variables you passed.
Examples
Display all available information about frame 2501:
VLATI-TXT output.npz output.pv 2501
Display velocity and position information from frame 491551:
VLATI-TXT output.npz output.pv 491551 -s vecs
Display all available information about frame 2661 relative to the moon:
VLATI-TXT output.npz output.pv 491551 -f moon
Display time and position/velocity information relative to the moon in frame 6000:
VLATI-TXT output.npz output.pv 6000 -f moon -s time vecs
VLATI-TXT needs to convert between ephemeris time and UTC. To do this, it needs a leap seconds file (naif0012.tls for this). It draws this file from conf.py.