org.orekit.attitudes

Class NadirPointing

java.lang.Object

org.orekit.attitudes.GroundPointing

org.orekit.attitudes.NadirPointing

All Implemented Interfaces:

Serializable, AttitudeProvider

public class NadirPointing
extends GroundPointing

This class handles nadir pointing attitude provider.

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

The object NadirPointing is guaranteed to be immutable.

Author:

Véronique Pommier-Maurussane

See Also:

GroundPointing, Serialized Form

Constructor Summary

Constructors

Constructor and Description
NadirPointing(Frame inertialFrame, BodyShape shape) Creates new instance.

Method Summary

Modifier and Type	Method and Description
<T extends org.hipparchus.RealFieldElement<T>> TimeStampedFieldPVCoordinates<T>	getTargetPV(FieldPVCoordinatesProvider<T> pvProv, FieldAbsoluteDate<T> date, Frame frame) Compute the target point position/velocity in specified frame.
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

getAttitude, getAttitude, getBodyFrame

Methods inherited from class java.lang.Object

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

Constructor Detail

NadirPointing

public NadirPointing(Frame inertialFrame,
                     BodyShape shape)
              throws OrekitException

Creates new instance.

Parameters:

inertialFrame - frame in which orbital velocities are computed

shape - Body shape

Throws:

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

Since:

7.1

Method Detail

getTargetPV

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

Compute the target point position/velocity in specified frame.

This method is public only to allow users to subclass this abstract class from other packages. It is not intended to be used directly.

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

getTargetPV

public <T extends org.hipparchus.RealFieldElement<T>> TimeStampedFieldPVCoordinates<T> getTargetPV(FieldPVCoordinatesProvider<T> pvProv,
                                                                                                   FieldAbsoluteDate<T> date,
                                                                                                   Frame frame)
                                                                                            throws OrekitException

Compute the target point position/velocity in specified frame.

Specified by:

getTargetPV in class GroundPointing

Type Parameters:

T - type of the fiels elements

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