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.
--------------------------------------------------------------------------
Form:
[uBVelocity, uBNadir, qEB] = ThrusterAlignment( r, v, aH, bHET, bST, jD, sep, constrain );
--------------------------------------------------------------------------
------
Inputs
------
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)
-------
Outputs
-------
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
--------------------------------------------------------------------------
AerospaceUtils: Coord/QHills Orbit: OrbitData/LEOData SC: Ephem/MoonV1 SC: Ephem/SunV1 Common: CommonData/SwooshWatermark Common: General/CellToMat Common: General/MatToCell Common: General/Watermark Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/PltStyle Common: Quaternion/AU2Q Common: Quaternion/AnimQ Common: Quaternion/Mat2Q Common: Quaternion/Q2Mat Common: Quaternion/QForm Common: Quaternion/QMult Common: Quaternion/QPose Common: Quaternion/QTForm Common: Quaternion/U2Q Common: Time/DTSToDTA Common: Time/Date2JD Common: Time/JD2000 Math: Geometry/Perpendicular Math: Linear/Cross Math: Linear/Dot Math: Linear/DupVect Math: Linear/Mag Math: Linear/Unit Math: Trigonometry/CosD Math: Trigonometry/SinD
Back to the FormationFlying Module page