fr.cnes.sirius.patrius.attitudes.slew

Class TwoSpinBiasSlewComputer

java.lang.Object

fr.cnes.sirius.patrius.attitudes.slew.TwoSpinBiasSlewComputer

All Implemented Interfaces:

Serializable

public class TwoSpinBiasSlewComputer
extends Object
implements Serializable

Class for two spin bias slew computation. Computation of slew returns a TabulatedSlew.

The two spin bias slew computes the attitude of the satellite from initial and final attitude laws, the parameters of the two angular velocity fields, plus the time step as well as the stabilization margin.
The angular velocity depends on the value of the slew angle.
Like all the other attitude legs, its interval of validity has closed endpoints.

Since:

4.5

Author:

Emmanuel Bignon

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TwoSpinBiasSlewComputer(double dtSCAOIn, double thetaMaxIn, double tauIn, double epsInRall, double omegaHigh, double thetaSwitch, double epsOutRall, double omegaLow, double tStab) Constructor.
TwoSpinBiasSlewComputer(double dtSCAOIn, double thetaMaxIn, double tauIn, double epsInRall, double omegaHigh, double thetaSwitch, double epsOutRall, double omegaLow, double tStab, String natureIn) Constructor.

Method Summary

Modifier and Type	Method and Description
TabulatedSlew	compute(PVCoordinatesProvider pvProv, AttitudeProvider initialLaw, AbsoluteDate initialDate, AttitudeProvider finalLaw, AbsoluteDate finalDate) Compute the slew.
double	computeDuration(PVCoordinatesProvider pvProv, AttitudeProvider initialLaw, AbsoluteDate initialDate, AttitudeProvider finalLaw, AbsoluteDate finalDate) Computes the actual slew duration.
double	computeMaxDuration() Estimate the maximum duration of the slew, before computing it.

Methods inherited from class java.lang.Object

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

Constructor Detail

TwoSpinBiasSlewComputer

public TwoSpinBiasSlewComputer(double dtSCAOIn,
                               double thetaMaxIn,
                               double tauIn,
                               double epsInRall,
                               double omegaHigh,
                               double thetaSwitch,
                               double epsOutRall,
                               double omegaLow,
                               double tStab)
                        throws PatriusException

Constructor.

Parameters:

dtSCAOIn - (dtScao) the time step [s].

thetaMaxIn - (angleMax) the limit of validity of the maneuver amplitude [rad].

tauIn - (τ) the time constant of the filter [s].

epsInRall - (seuilEntree) initial orientation error threshold [rad].

omegaHigh - (biaisVitesse) the high angular velocity value [rad/s].

thetaSwitch - (seuil) the threshold for the low/high angular velocity switch [rad].

epsOutRall - (seuilSortie) final orientation error threshold [rad].

omegaLow - (biaisVitesseBas) the low angular velocity value [rad/s].

tStab - (margeStabilisation) the stabilisation margin [s].

Throws:

PatriusException - when the sampling step in not valid

TwoSpinBiasSlewComputer

public TwoSpinBiasSlewComputer(double dtSCAOIn,
                               double thetaMaxIn,
                               double tauIn,
                               double epsInRall,
                               double omegaHigh,
                               double thetaSwitch,
                               double epsOutRall,
                               double omegaLow,
                               double tStab,
                               String natureIn)
                        throws PatriusException

Constructor.

The two spin bias slew computes the attitude of the satellite from initial and final attitude laws, the parameters of the two angular velocity fields, plus the time step as well as the stabilization margin.
The angular velocity depends on the value of the slew angle.

Parameters:

dtSCAOIn - (dtScao) the time step [s].

thetaMaxIn - (angleMax) the limit of validity of the maneuver amplitude [rad].

tauIn - (τ) the time constant of the filter [s].

epsInRall - (seuilEntree) initial orientation error threshold [rad].

omegaHigh - (biaisVitesse) the high angular velocity value [rad/s].

thetaSwitch - (seuil) the threshold for the low/high angular velocity switch [rad].

epsOutRall - (seuilSortie) final orientation error threshold [rad].

omegaLow - (biaisVitesseBas) the low angular velocity value [rad/s].

tStab - (margeStabilisation) the stabilisation margin [s].

natureIn - leg nature

Throws:

PatriusException - when the sampling step in not valid

Method Detail

compute

public TabulatedSlew compute(PVCoordinatesProvider pvProv,
                             AttitudeProvider initialLaw,
                             AbsoluteDate initialDate,
                             AttitudeProvider finalLaw,
                             AbsoluteDate finalDate)
                      throws PatriusException

Compute the slew.

Parameters:

pvProv - satellite PV coordinates through time

initialLaw - initial attitude law (before the slew)

initialDate - slew start date (may be null if slew defined with its end date)

finalLaw - final attitude law (after the slew)

finalDate - slew end date (currently unused)

Returns:

built slew

Throws:

PatriusException - thrown if computation failed

computeDuration

public double computeDuration(PVCoordinatesProvider pvProv,
                              AttitudeProvider initialLaw,
                              AbsoluteDate initialDate,
                              AttitudeProvider finalLaw,
                              AbsoluteDate finalDate)
                       throws PatriusException

Computes the actual slew duration.

Parameters:

pvProv - the PV coordinates provider

initialLaw - initial attitude law (before the slew)

initialDate - slew start date (may be null if slew defined with its end date)

finalLaw - final attitude law (after the slew)

finalDate - slew end date (currently unused)

Returns:

the actual slew duration

Throws:

PatriusException - when an error occurs during attitudes computation

computeMaxDuration

public double computeMaxDuration()

Estimate the maximum duration of the slew, before computing it.

Returns:

the estimated maximum duration of the slew.