org.orekit.attitudes
Class BodyCenterPointing

java.lang.Object
  org.orekit.attitudes.GroundPointing
      org.orekit.attitudes.BodyCenterPointing

All Implemented Interfaces:

java.io.Serializable, AttitudeLaw

public class BodyCenterPointing
extends GroundPointing

This class handles body center pointing attitude law.

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

The object BodyCenterPointing is guaranteed to be immutable.

Version:

$Revision:1665 $ $Date:2008-06-11 12:12:59 +0200 (mer., 11 juin 2008) $

Author:

Véronique Pommier-Maurussane

See Also:

GroundPointing, Serialized Form

Constructor Summary

BodyCenterPointing(Frame bodyFrame)
Creates new instance.

Method Summary

protected org.apache.commons.math.geometry.Vector3D	getTargetPoint(Orbit orbit, Frame frame) Compute the target point in specified frame.
protected PVCoordinates	getTargetPV(Orbit orbit, 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 org.apache.commons.math.geometry.Vector3D getTargetPoint(Orbit orbit,
                                                                   Frame frame)
                                                            throws OrekitException

Compute the target point in specified frame.

Specified by:

getTargetPoint in class GroundPointing

Parameters:

orbit - orbit state

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(Orbit orbit,
                                    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:

orbit - orbit state

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