org.orekit.attitudes

Class LofOffsetPointing

java.lang.Object

org.orekit.attitudes.GroundPointing

org.orekit.attitudes.LofOffsetPointing

All Implemented Interfaces:

Serializable, AttitudeProvider

public class LofOffsetPointing
extends GroundPointing

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(Frame inertialFrame, BodyShape shape, AttitudeProvider attLaw, Vector3D satPointingVector) Creates new instance.

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 TimeStampedPVCoordinates	getTargetPV(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the target point position/velocity in specified frame.

Methods inherited from class org.orekit.attitudes.GroundPointing

getBodyFrame

Methods inherited from class java.lang.Object

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

Constructor Detail

LofOffsetPointing

public LofOffsetPointing(Frame inertialFrame,
                         BodyShape shape,
                         AttitudeProvider attLaw,
                         Vector3D satPointingVector)
                  throws OrekitException

Creates new instance.

Parameters:

inertialFrame - frame in which orbital velocities are computed

shape - Body shape

attLaw - Attitude law

satPointingVector - satellite vector defining the pointing direction

Throws:

OrekitException - if the frame specified is not a pseudo-inertial frame

Since:

7.1

Method Detail

getAttitude

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

Compute the attitude corresponding to an orbital state.

Specified by:

getAttitude in interface AttitudeProvider

Overrides:

getAttitude in class GroundPointing

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:

OrekitException - if attitude cannot be computed

getTargetPV

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

Compute the target point position/velocity in specified frame.

Specified by:

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 (element 0) and velocity (at index 1) in specified frame

Throws:

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