org.orekit.attitudes
Class TargetGroundPointing

java.lang.Object
  org.orekit.attitudes.AbstractAttitudeLaw
      org.orekit.attitudes.GroundPointing
          org.orekit.attitudes.TargetGroundPointing

All Implemented Interfaces:

Serializable, AttitudeLaw, AttitudeProvider

public class TargetGroundPointing
extends GroundPointing

This class handles target pointing attitude provider; while the class TargetPointing does not guarantee the target point belongs to the body surface, this class always provides a ground point target.

The satellite z axis is pointing to a ground point target.

Since:

2.0

Version:

$Id: TargetGroundPointing.java 15547 2016-03-09 13:43:41Z bignon $

Author:

Tiziana Sabatini

See Also:

GroundPointing, TargetPointing, Serialized Form

Concurrency :

immutable

Constructor Summary

TargetGroundPointing(BodyShape shape, GeodeticPoint targetGeo)
Creates a new instance from body shape and target expressed in geodetic coordinates.

TargetGroundPointing(BodyShape bodyShape, Vector3D target)
Creates a new instance from body shape and target expressed in cartesian coordinates.

Method Summary

protected Vector3D

getTargetPoint(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the target point in specified frame.

Methods inherited from class org.orekit.attitudes.GroundPointing

getAttitude, getBodyFrame, getBodyShape, getTargetPV

Methods inherited from class org.orekit.attitudes.AbstractAttitudeLaw

getAttitude, getSpinDerivativesComputation, setSpinDerivativesComputation

Methods inherited from class java.lang.Object

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

Constructor Detail

TargetGroundPointing

public TargetGroundPointing(BodyShape bodyShape,
                            Vector3D target)

Creates a new instance from body shape and target expressed in cartesian coordinates.

Parameters:

bodyShape - body shape.

target - target position in body frame

TargetGroundPointing

public TargetGroundPointing(BodyShape shape,
                            GeodeticPoint targetGeo)

Creates a new instance from body shape and target expressed in geodetic coordinates.

Parameters:

shape - body shape

targetGeo - target defined as a geodetic point in body shape 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