org.orekit.attitudes
Class IsisNumericalSpinBiasSlew

java.lang.Object
  org.orekit.attitudes.AbstractSlew
      org.orekit.attitudes.AbstractIsisSpinBiasSlew
          org.orekit.attitudes.IsisNumericalSpinBiasSlew

All Implemented Interfaces:

Serializable, AttitudeLeg, AttitudeProvider, Slew

public class IsisNumericalSpinBiasSlew
extends AbstractIsisSpinBiasSlew

ISIS spin bias slew: slew with trapezoidal angular velocity profile.

Slew is computed analytically.

Since:

3.3

Version:

$Id: IsisNumericalSpinBiasSlew.java 16649 2016-09-20 14:59:16Z bignon $

Author:

Emmanuel Bignon

See Also:

Serialized Form

Concurrency :

not thread safe

Field Summary

Fields inherited from class org.orekit.attitudes.AbstractIsisSpinBiasSlew

accelDuration, accelMax, decelDuration, decelMax, dtSCAO, durationWoTranq, ephem, initialDate, refFrame, slewAngle, slewAxis, spinDerivativesComputation

Fields inherited from class org.orekit.attitudes.AbstractSlew

computed, currentProvider, fLaw, iLaw, intervalOfValidity

Constructor Summary

IsisNumericalSpinBiasSlew(AttitudeProvider initialLawIn, AttitudeProvider finalLawIn, AbsoluteDate initialDateIn, double dtSCAOIn, double thetaMaxAllowedIn, double durationMaxIn, double dtConvergenceThresholdIn, double[][] inertiaMatrixIn, double rwTorqueAllocAccelIn, double rwTorqueAllocDecelIn, double rwDeltaMomentumAllocIn, double[][] rwMatrixIn, double tranquillisationTimeIn)
Constructor with default maximum number of iterations allowed for slew duration computation's convergence.

IsisNumericalSpinBiasSlew(AttitudeProvider initialLawIn, AttitudeProvider finalLawIn, AbsoluteDate initialDateIn, double dtSCAOIn, double thetaMaxAllowedIn, double durationMaxIn, double dtConvergenceThresholdIn, double[][] inertiaMatrixIn, double rwTorqueAllocAccelIn, double rwTorqueAllocDecelIn, double rwDeltaMomentumAllocIn, double[][] rwMatrixIn, double tranquillisationTimeIn, int maxIterationsNumberIn)
Constructor.

Method Summary

void	compute(PVCoordinatesProvider pvProv) Compute the slew corresponding to an orbital state.

Methods inherited from class org.orekit.attitudes.AbstractIsisSpinBiasSlew

computeDuration, getAttitude, setSpinDerivativesComputation

Methods inherited from class org.orekit.attitudes.AbstractSlew

getAttitude, getAttitude, getDuration, getTimeInterval

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IsisNumericalSpinBiasSlew

public IsisNumericalSpinBiasSlew(AttitudeProvider initialLawIn,
                                 AttitudeProvider finalLawIn,
                                 AbsoluteDate initialDateIn,
                                 double dtSCAOIn,
                                 double thetaMaxAllowedIn,
                                 double durationMaxIn,
                                 double dtConvergenceThresholdIn,
                                 double[][] inertiaMatrixIn,
                                 double rwTorqueAllocAccelIn,
                                 double rwTorqueAllocDecelIn,
                                 double rwDeltaMomentumAllocIn,
                                 double[][] rwMatrixIn,
                                 double tranquillisationTimeIn)

Constructor with default maximum number of iterations allowed for slew duration computation's convergence.

Parameters:

initialLawIn - attitudeProvider representing the attitude law before the slew

finalLawIn - attitudeProvider representing the attitude law after the slew

initialDateIn - initial date of the slew

dtSCAOIn - time step (s)

thetaMaxAllowedIn - maximum slew angular amplitude allowed (rad)

durationMaxIn - maximum duration expected for the slew, including the tranquilisation phase (s)

dtConvergenceThresholdIn - convergence threshold for the iterative computation of the slew duration (s)

inertiaMatrixIn - satellite inertia matrix in satellite reference frame (kg.m^2)

rwTorqueAllocAccelIn - torque allocation for each RW during the acceleration phase (N.m)

rwTorqueAllocDecelIn - torque allocation for each RW during the deceleration phase (assumed > 0) (N.m)

rwDeltaMomentumAllocIn - angular momentum allocation for each RW during the manoeuvre (N.m.s)

rwMatrixIn - cosine directors matrix of the reaction wheels in the satellite reference frame. Matrix 3xN_RW with N_RW wheels (Reaction wheels spin axes written in column in the satellite reference frame).

tranquillisationTimeIn - tranquilisation time after the end of the slew (s)

IsisNumericalSpinBiasSlew

public IsisNumericalSpinBiasSlew(AttitudeProvider initialLawIn,
                                 AttitudeProvider finalLawIn,
                                 AbsoluteDate initialDateIn,
                                 double dtSCAOIn,
                                 double thetaMaxAllowedIn,
                                 double durationMaxIn,
                                 double dtConvergenceThresholdIn,
                                 double[][] inertiaMatrixIn,
                                 double rwTorqueAllocAccelIn,
                                 double rwTorqueAllocDecelIn,
                                 double rwDeltaMomentumAllocIn,
                                 double[][] rwMatrixIn,
                                 double tranquillisationTimeIn,
                                 int maxIterationsNumberIn)

Constructor.

Parameters:

initialLawIn - attitudeProvider representing the attitude law before the slew

finalLawIn - attitudeProvider representing the attitude law after the slew

initialDateIn - initial date of the slew

dtSCAOIn - time step (s)

thetaMaxAllowedIn - maximum slew angular amplitude allowed (rad)

durationMaxIn - maximum duration expected for the slew, including the tranquilisation phase (s)

dtConvergenceThresholdIn - convergence threshold for the iterative computation of the slew duration (s)

inertiaMatrixIn - satellite inertia matrix in satellite reference frame (kg.m^2)

rwTorqueAllocAccelIn - torque allocation for each RW during the acceleration phase (N.m)

rwTorqueAllocDecelIn - torque allocation for each RW during the deceleration phase (assumed > 0) (N.m)

rwDeltaMomentumAllocIn - angular momentum allocation for each RW during the manoeuvre (N.m.s)

rwMatrixIn - cosine directors matrix of the reaction wheels in the satellite reference frame. Matrix 3xN_RW with N_RW wheels (Reaction wheels spin axes written in column in the satellite reference frame).

tranquillisationTimeIn - tranquilisation time after the end of the slew (s)

maxIterationsNumberIn - maximum number of iterations allowed for slew duration computation's convergence

Method Detail

compute

public void compute(PVCoordinatesProvider pvProv)
             throws OrekitException

Compute the slew corresponding to an orbital state.

Parameters:

pvProv - : local position-velocity provider around current date

Throws:

OrekitException - orekit exception