org.orekit.attitudes

Class BodyCenterPointing

java.lang.Object

org.orekit.attitudes.GroundPointing

org.orekit.attitudes.BodyCenterPointing

All Implemented Interfaces:

Serializable, AttitudeProvider

public class BodyCenterPointing
extends GroundPointing

This class handles body center pointing attitude provider.

This class represents the attitude provider where the satellite z axis is pointing to the body frame center.

The object BodyCenterPointing is guaranteed to be immutable.

Author:

Véronique Pommier-Maurussane

See Also:

GroundPointing, Serialized Form

Constructor Summary

Constructors

Constructor and Description
BodyCenterPointing(Frame bodyFrame) Creates new instance.

Method Summary

Methods

Modifier and Type	Method and Description
protected Vector3D	getTargetPoint(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the target point in specified frame.
protected PVCoordinates	getTargetPV(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the target point position/velocity in specified frame.

Methods inherited from class org.orekit.attitudes.GroundPointing

getAttitude, getBodyFrame

Methods inherited from class java.lang.Object

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

Constructor Detail

BodyCenterPointing

public BodyCenterPointing(Frame bodyFrame)

Creates new instance.

Parameters:

bodyFrame - Body frame

Method Detail

getTargetPoint

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

Compute the target point in specified frame.

Specified by:

getTargetPoint in class GroundPointing

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:

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

getTargetPV

protected PVCoordinates getTargetPV(PVCoordinatesProvider pvProv,
                        AbsoluteDate date,
                        Frame frame)
                             throws OrekitException

Compute the target point position/velocity in specified frame.

The default implementation use a simple two points finite differences scheme, it may be replaced by more accurate models in specialized implementations.

Overrides:

getTargetPV in class GroundPointing

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/velocity in specified frame

Throws:

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