guidance after high gate is wobbly
Various orbital physics tools written in kOS for Kerbal Space Program
Status: Beta
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#3 guidance after high gate is wobbly
mam.ks and land.ks still do not work right. They point completely horizontally when the ship descends below low gate. They are not brilliant between high and low gates either.
Do not despair, you are 90% there. It's pretty good all in all, as falcon9test proves by sometimes landing right on the launch pad.
Part of this is caused by the way low gate aims. It should target above the LZ, so that the ship comes down vertically, not at a 45° angle. This has been partially fixed in landnatm.ks. How much to aim above LZ is as of yet, unknown.
Steering still needs work, but has been improved too.
Last edit: Stäphen Goedzal 2019-12-06
There is a bug in surftarg that sometimes gives us a trajectory that is too low. It has been partially fixed in r73 (I believe this was also responsible for the times it cant find a solution in the most obvious of situations).
The problem remains that all the landing systems fail miserably when they find themselves too low and too far from the target. We need to modify it so that it detects the situation and fires directly up until the range to target is reasonable or something... Then we can simplify the remaining landing code.
Last edit: Stäphen Goedzal 2020-01-10
r78 includes apollo 11 guidance mathematics in landnatm.ks that fixes this for some situations.
Apollo PDG was designed for their rocket only, not ours, so it does not fix all situations.
The ultimate goal is a ground-to-ground hop-up mission. I need to add a different bug report for this, but am working on it now.