Path: FormationFlying/Coord
% Computes body vectors to align with velocity and nadir for a thruster firing.
The constraint is to keep the star tracker pointed as far away from the sun,
earth and moon as possible.
Since version 7.
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Form:
[uBVelocity, uBNadir, qEB] = ThrusterAlignment( r, v, aH, bHET, bST, jD, sep, constrain );
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Inputs
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r (3,1) Position in ECI at burn time [km]
v (3,1) Velocity in ECI at burn time [km/s]
aH (3,1) Unit Hills frame vector of applied acceleration
bHET (3,1) Unit body vector of Hall Effect Thruster nozzle
bST (3,1) Unit body vector of star tracker bore-sight
jD (1) Julian Date of burn time [JD]
sep (1) Required angular separation between bore-sight and
bright body horizon [rad]
constrain (1) Flag to indicate whether to consider bright-body constraint
Optional. Default is 1 (constraint considered)
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Outputs
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uBVelocity (3,1) Unit body vector to align with velocity direction
uBNadir (3,1) Unit body vector to align with nadir direction
qEB (4,1) Desired ECI-to-body quaternion
okay (1) Boolean flag indicating whether angular separation
constraints were satisfield
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