Path: SCPro/DynamicalModels
% Spacecraft attitude and orbit dynamics with a disturbance function.
This is a rigid body with an external force and torque input.
The position is in km. The gravity model is for a point mass.
The force and torque area constant across the integration time step.
The function fDist (which should be a pointer) is of the form
[force, torque] = MyFun( x, t, d )
You can add additional fields to d. force must be in N in the body
frame and torque in Nm in the body frame. This function allows you
to add forces and torques within the integration loop. This is
required for forces and torques that are functions of time or the
state vector.
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Form:
xDot = RHSRigidBody( x, t, d )
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Inputs
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x (20,1) State vector [r;v;q;w;m;inertia] (km,km/s,,rad/s,kg,kg-m^2)
t (1,1) Time (s)
d (1,1) Data structure for the simulation
.torque (3,1) External torque (Nm)
.thrust (1,1) Engine Thrust (N)
.uThrust (3,1) Unit vector in the body frame
.rThrust (3,1) Thrust position in the body frame
.inertia (3,3) Vehicle inertia (kg-m^2)
.inertia (3,3) Vehicle inertia (kg-m^2)
.massDry (1,1) Vehicle dry mass (kg)
.aGrav (1,1) Pointer to gravity function
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Outputs
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xDot (:,1) dx/dt
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AerospaceUtils: Coord/QIToBDot Common: Database/Constant Common: Quaternion/QTForm Common: Time/Date2JD Common: Time/JD2000 Math: Linear/Cross Math: Linear/Mag Math: Linear/Skew
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