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Questions tagged [flight-control]

Systems and software used to control a space craft in an atmosphere.

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6answers
601 views

Is it possible to navigate space travel with no computer?

From launch to land could a person travel in space with only mechanical devices like a sextant? With enough experience what would be the minimum devices needed? Which vehicle currently would be easier ...
3
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0answers
108 views

Why would someone use Modified Rodrigues Parameters over Quaternions for spacecraft attitude estimation? And vice versa?

I see quite some papers on spacecraft attitude determination and control, that rely on quaternions. While some others rely on MRPs. The advantage that I see so far is that... for quaternions, the ...
0
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0answers
145 views

Avionics Systems on board Falcon 9 (Reusable)

What kind of control systems are active and how do they function on board a Falcon 9 booster while it's landing ?
12
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1answer
3k views

How can a rocket go straight up after ignition? [duplicate]

We have seen during rocket launches that the rocket goes straight up after the launch clamps have disconnected. What ensures that it doesn't tilt because of the uneven mass distribution? How does a ...
8
votes
1answer
364 views

Machine Learning and Classical Navigation, Guidance and Control in Space Exploration

Due to the increasing availability of large quantities of data and computational power, machine learning (ML) is providing increasingly better results in various fields. Much research has been done on ...
4
votes
4answers
317 views

Using what technology one can keep a spacecraft truly non rotating

Inspired by the question I thought maybe a photon thruster can be used for precisely giving thrust to maintain spacecraft attitude. But soon I realized that for high precision attitude control, one ...
1
vote
1answer
98 views

An program that automatically generates a rocket guidance system?

This is for a liquid propelled rocket that launches from earth. It could also perhaps be used for orbital maneuvers and landing on the Moon (not mars or earth). The inputs for such a program would ...
13
votes
4answers
2k views

How were the pilots of the space shuttle able to operate the rudder after time in space?

I've just watched this video showing three astronauts who've returned from space. At around the 5:46 mark in the video we can see astronaut Chris Hadfield being carried out of the Soyuz capsule. I've ...
7
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0answers
66 views

Implementing control system to track position and velocity references simultaneously

I've been trying to implement a PI (proportional-integral) controller to allow a launch vehicle to track 2 reference states simultaneous, namely position and velocity, so that the launch vehicle will ...
4
votes
2answers
273 views

SpaceX stage 1 reentry control?

In watching today's BulgariaSat-1 broadcast: It was mentioned that the drone ship had acquired the 1st stage as it was returning. I had always been under the ...
4
votes
2answers
391 views

Does the Hubble telescope use a “simple” PID-controller for its pointing control system?

I am wondering whether the Hubble Space Telescope uses a "simple" PID controller like this: Or is it using another type of control system that may be much more complex?
5
votes
1answer
240 views

Controller to reaction wheel interface

A typical controller generally gives control torques which should be applied about the axis of a satellite. How exactly is this torque applied using a reaction wheel? For example if control torques ...
7
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4answers
1k views

Why does spinning help stabilisation?

I don't really understand why do we use spin stabilisation for rocket launches? If I understand correctly, the idea is to make the rocket spin really fast so that any asymmetry in the thrust/...
1
vote
2answers
223 views

How much can static cling be used to move things in space? Tractor Beam

Can static cling occurs in space? Can a static charge be amplified laterally to move objects in space similar to Star Trek's tractor beam? Can a static charge could be carried by a sustained particle ...
1
vote
0answers
76 views

Linear Control Lock?

Assume a spacecraft with a less-than-perfect maneuvering thruster configuration such that in a particular attitude while attempting to dock, the thrusters will not allow translation along a particular ...
9
votes
3answers
2k views

Does the way this experimental kill vehicle moves and thrusts suggest it contains inertia wheels?

This comment below this answer about 'spacecraft' or at least 'craft' that can maneuver near the surface of low gravity bodies links to this video about Lockeed Martin's Multiple Kill Vehicle. If I ...
4
votes
1answer
269 views

Apollo CSM thruster quad orientations vs LM

Can anyone explain to me the reasoning behind the differences in the placement and orientation of the thruster quad packages on the CSM and LM? On the CSM a quad is a + shape and are located in a ...
0
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0answers
96 views

Will there be torques on spacecraft due to interaction of magnetic torquer with the residual magnetic field of the spacecraft?

Assuming the magnetorquer and the field generating electronics are both rigidly fixed to the spacecraft cube. Reference to any supporting papers/articles would be great. Thanks. Would the residual ...
4
votes
1answer
479 views

How to select/design a control algorithm for spacecraft attitude control?

Control algorithms are used on spacecraft to operate reaction wheels, RCS thrusters and other actuators. Since of the most common controllers I've come across are the PID and quaternion error command. ...
7
votes
0answers
464 views

How is retropropulsion by the Falcon 9 first stage being used to design retropropulsion entry on Mars?

Much has been made of how the reentry burns of Falcon 9 first stages occur at an altitude where the atmosphere is similar in density to the atmosphere of Mars, and so they demonstrate that supersonic ...
2
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2answers
397 views

Rocket drag and lift based on flight direction - in which frame of reference?

Drag is aerodynamic force component parallel to the direction of motion. Lift is aerodynamic force component perpendicular to the direction of motion. Direction of motion with respect to what? 1) ...
6
votes
3answers
941 views

Is aerodynamic lift ever useful in rocket flight?

When a rocket is traveling through an atmosphere, the component of the aerodynamic force in the direction of motion is called drag, and the component perpendicular to that is called lift. Usually a ...