fr.cnes.sirius.patrius.attitudes

Class LofOffsetPointing

java.lang.Object

fr.cnes.sirius.patrius.attitudes.AbstractAttitudeLaw

fr.cnes.sirius.patrius.attitudes.AbstractGroundPointing

fr.cnes.sirius.patrius.attitudes.LofOffsetPointing

All Implemented Interfaces:

AttitudeLaw, AttitudeProvider, Serializable

public class LofOffsetPointing
extends AbstractGroundPointing

This class provides a default attitude provider.

The attitude pointing law is defined by an attitude provider and the satellite axis vector chosen for pointing.

Author:

Véronique Pommier-Maurussane

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LofOffsetPointing(BodyShape shape, AttitudeProvider attLaw, Vector3D satPointingVectorIn) Creates new instance.
LofOffsetPointing(BodyShape shape, AttitudeProvider attLaw, Vector3D satPointingVectorIn, Vector3D losInSatFrameVec, Vector3D losNormalInSatFrameVec) Constructor.

Method Summary

Modifier and Type	Method and Description
Attitude	getAttitude(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the attitude corresponding to an orbital state.
protected Vector3D	getTargetPoint(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the target point in specified frame.
void	setSpinDerivativesComputation(boolean computeSpinDerivatives) Method to activate spin derivative computation.

Methods inherited from class fr.cnes.sirius.patrius.attitudes.AbstractGroundPointing

getBodyFrame, getBodyShape, getTargetPV

Methods inherited from class fr.cnes.sirius.patrius.attitudes.AbstractAttitudeLaw

getAttitude, getSpinDerivativesComputation

Methods inherited from class java.lang.Object

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

Constructor Detail

LofOffsetPointing

public LofOffsetPointing(BodyShape shape,
                         AttitudeProvider attLaw,
                         Vector3D satPointingVectorIn)

Creates new instance.

Parameters:

shape - Body shape

attLaw - Attitude law

satPointingVectorIn - satellite vector defining the pointing direction

LofOffsetPointing

public LofOffsetPointing(BodyShape shape,
                         AttitudeProvider attLaw,
                         Vector3D satPointingVectorIn,
                         Vector3D losInSatFrameVec,
                         Vector3D losNormalInSatFrameVec)

Constructor. Create a BodyCenterGroundPointing attitude provider with specified los axis in satellite frame.

Parameters:

shape - Body shape

attLaw - Attitude law

satPointingVectorIn - satellite vector defining the pointing direction

losInSatFrameVec - LOS in satellite frame axis

losNormalInSatFrameVec - LOS normal axis in satellite frame

Method Detail

getAttitude

public Attitude getAttitude(PVCoordinatesProvider pvProv,
                            AbsoluteDate date,
                            Frame frame)
                     throws PatriusException

Compute the attitude corresponding to an orbital state.

Specified by:

getAttitude in interface AttitudeProvider

Overrides:

getAttitude in class AbstractGroundPointing

Parameters:

pvProv - local position-velocity provider around current date

date - current date

frame - reference frame from which attitude is computed

Returns:

attitude attitude on the specified date and position-velocity state

Throws:

PatriusException - if attitude cannot be computed

getTargetPoint

protected Vector3D getTargetPoint(PVCoordinatesProvider pvProv,
                                  AbsoluteDate date,
                                  Frame frame)
                           throws PatriusException

Compute the target point in specified frame.

Specified by:

getTargetPoint in class AbstractGroundPointing

Parameters:

pvProv - provider for PV coordinates

date - date at which target point is requested

frame - frame in which observed ground point should be provided

Returns:

observed ground point position in specified frame

Throws:

PatriusException - if some specific error occurs, such as no target reached

setSpinDerivativesComputation

public void setSpinDerivativesComputation(boolean computeSpinDerivatives)
                                   throws PatriusException

Method to activate spin derivative computation.

Spin derivatives computation applies to provided law attitudeLaw.

Specified by:

setSpinDerivativesComputation in interface AttitudeProvider

Overrides:

setSpinDerivativesComputation in class AbstractAttitudeLaw

Parameters:

computeSpinDerivatives - true if spin derivatives should be computed

Throws:

PatriusException - if spin derivatives can not be computed