AOCS - Attitude and orbit control systems

What factors affect AOCS?

What assumptions are made during Keplerian orbit theory?

How are some of these assumptions not correct?

When do these assumptions break down?

What external body mass factors affect AOCS?

What external space effects affect AOCS?

What internal effects affect AOCS?

What are the main factors considered?

How are Jn and Pn all related?

How is the 'real' shape of the geopotentials obtained?

What internal dynamic properties are needed to considered by the AOCS?

What is 'tail wagging of the dog'?

Why is the ratio of principle moments of inertia very important?

If its rotating initially about some other axis and there is some energy loss mechanism (sloshing fuel or loose structure) what will happen?

How are these effects countered by the AOCS?

How is translation measured?

Why won't accelerometers on board NOT give us motion in a terrestrial airborne INS?

What are the translation actuators?

What is really important in terms of thrusters application?

Why is true linear proportional control impossible?

Where is translational control strategy usually controlled from and what is it applied to?

If a change in apogee is required where is the change made?

Manoeuvres at which point are preferable, apogee or perigee and why?

What constitutes a passive orbit controller?

How are attitude measurements usually made?

What are used for very accurate attitude control?

What methods can be used in order to control attitude?

How do reaction thrusters work?

How do reaction wheels work?

What is the disadvantage of using reaction wheels?

How do momentum wheels work?

What is the disadvantage of using momentum wheels?

Both gyroscopic wheels create disturbing torques in one direction, what needs to be done to correct it and how?

How are gyroscopic wheels preferable over thrusters?

In all three devices there must be enough devices for 3 axis control, this means 3 perpendicular reaction wheels, why is a fourth wheel added?

How do magnetorquers control attitude?

What are the advantages of magnetorques?

What are the disadvantages of magnetorques

How can a spacecraft be spin stabilised?

Which produces attitude change in this case the precession or the thrusters?

How can spin stabilised be useful?

Dual spin stabilised concepts are useful when?

When is there cross coupling?

Why are multi-axis control schemes not used?

When does a spacecraft experience a restoring force due to gravity?

When can gravity gradient stabilisation be used as an effective ACS strategy in 2 axes?

How can AOCS become more complicated?

How can a GEO satellites AOCS be complicated?

What is required for a GTO?

When does polar flattening occur?

How is motion is z direction affected?