[HN Gopher] A Real-Time Algorithm for Non-Convex Powered Descent...
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A Real-Time Algorithm for Non-Convex Powered Descent Guidance [pdf]
Author : nill0
Score : 40 points
Date : 2025-04-19 12:25 UTC (3 days ago)
(HTM) web link (depts.washington.edu)
(TXT) w3m dump (depts.washington.edu)
| RansomStark wrote:
| I must be half asleep, I was expecting some novel machine
| learning algorithm. I was pleasantly surprised to find a
| spaceflight algorthim instead.
|
| I am completely out of my depth, so have nothing constructive to
| add. But it sounds interesting.
| wiz21c wrote:
| Funny, I fell into that one too... I guess "guidance" has a few
| letters in common with "gradient" so our brain triggers...
|
| See: https://medium.com/@stephenwatathi/the-brains-power-to-
| read-...
| vessenes wrote:
| This is the algorithm SpaceX uses to catch rockets. If you watch
| any of the landings/chopstick catches, you'll notice that they
| don't seem to oscillate back and forth like a lot of control
| systems we're "used to" seeing.
|
| This algorithm is why! Super cool.
| metalman wrote:
| so as soon as the rocket starts to fall @ the minimum controll
| speed, they draw a virtual strait line between the rocket and
| the landing spot, and follow it, sort of an inverse geodetic
| line, compensate for wind with the "flaps" and vectored thrust
| on the rockets, giving enough horizontal thrust, and gravity
| providing a very steady and reliable pull makes a lot of sense,
| as it is the most fuel efficient and fastest return, and any
| issues with guidance are imediately clear, making it part of
| the abort system as well
| xiaoyu2006 wrote:
| Reminds me of L. Blackmore's
| https://www.semanticscholar.org/paper/Lossless-Convexificati...
| pugworthy wrote:
| Would love to see this control a classic Lunar Lander type game
| such as http://moonlander.seb.ly/
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