org.orekit.attitudes
Class NadirPointing

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

All Implemented Interfaces:

java.io.Serializable, AttitudeLaw

public class NadirPointing
extends GroundPointing

This class handles nadir pointing attitude law.

This class represents the attitude law where the satellite z axis is pointing to the vertical of the ground point under satellite.

The object NadirPointing 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

NadirPointing(BodyShape shape)
Creates new instance.

Method Summary

protected org.apache.commons.math.geometry.Vector3D

getTargetPoint(Orbit orbit, Frame frame) Compute the target point in specified frame.

Methods inherited from class org.orekit.attitudes.GroundPointing

getAttitude, getBodyFrame, getTargetPV

Methods inherited from class java.lang.Object

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

Constructor Detail

NadirPointing

public NadirPointing(BodyShape shape)

Creates new instance.

Parameters:

shape - Body shape

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