I want to test Gpredict algo when satellite pass by El 90. I need a reproducible result. How can I test such scenario? Should I generate fake TLE? If so is there software to generate simple fake TLE file based on start, end points?
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Donāt use fake TLE; itās too much work and makes it harder to control accurately.
To test the Gpredict antenna algo at El ~90Ā°, just choose a real TLE for a high-inclination LEO (like ISS) and change the lat/long of your ground station a little bit so that the pass goes over your head. Zenith passes are very sensitive to where they are. Moving a few kilometers can change the maximum elevation from about 70Ā° to 90Ā°.
for tests that can be repeated:
Set the time in Gpredict (use ātime controllerā) and lock the TLE (donāt change it).
turn off automatic updates
run the same time stamp every time
If you really want to test edge cases (like crossing at exactly 90Ā°), the best way to do it is:
Use a circular orbit with an inclination of about 90Ā°. Move the observer until Gpredict shows max El ā 89ā90Ā°.
When your rotator is near the zenith, itās more about how it handles azimuth flips than how accurate the TLE is. So pay attention to how your rotator config handles that one thing (some just jitter or spin).
In short, donāt fake TLE. Instead, control the observer and the time. Itās much cleaner.