Package org.orekit.attitudes

Class NadirPointing

java.lang.Object

org.orekit.attitudes.GroundPointing

org.orekit.attitudes.NadirPointing

All Implemented Interfaces:

AttitudeProvider, EventDetectorsProvider

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

Field Summary

Fields inherited from interface org.orekit.propagation.events.EventDetectorsProvider

DATATION_ACCURACY

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected <T extends CalculusFieldElement<T>> FieldVector3D<T>	getTargetPosition(FieldPVCoordinatesProvider<T> pvProv, FieldAbsoluteDate<T> date, Frame frame)	Compute the target point position in specified frame.
protected Vector3D	getTargetPosition(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame)	Compute the target point position in specified frame.
<T extends CalculusFieldElement<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.
<T extends CalculusFieldElement<T>> TimeStampedFieldPVCoordinates<T>	getTargetPVViaInterpolation(FieldPVCoordinatesProvider<T> pvProv, FieldAbsoluteDate<T> date, Frame frame)	Compute target position-velocity-acceleration vector via interpolation (Field version).
TimeStampedPVCoordinates	getTargetPVViaInterpolation(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame)	Compute target position-velocity-acceleration vector via interpolation.

Methods inherited from class org.orekit.attitudes.GroundPointing

getAttitude, getAttitude, getAttitudeRotation, getAttitudeRotation, getBodyFrame

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.attitudes.AttitudeProvider

getEventDetectors, getFieldEventDetectors

Methods inherited from interface org.orekit.propagation.events.EventDetectorsProvider

getEventDetectors, getFieldEventDetectors

Constructor Detail

NadirPointing

public NadirPointing(Frame inertialFrame,
                     BodyShape shape)

Creates new instance.

Parameters:

inertialFrame - frame in which orbital velocities are computed

shape - Body shape

Since:

7.1

Method Detail

getTargetPV

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

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

getTargetPVViaInterpolation

public TimeStampedPVCoordinates getTargetPVViaInterpolation(PVCoordinatesProvider pvProv,
                                                            AbsoluteDate date,
                                                            Frame frame)

Compute target position-velocity-acceleration vector via interpolation.

Parameters:

pvProv - PV provider

date - date

frame - frame

Returns:

target position-velocity-acceleration

getTargetPosition

protected Vector3D getTargetPosition(PVCoordinatesProvider pvProv,
                                     AbsoluteDate date,
                                     Frame frame)

Compute the target point position in specified frame.

Overrides:

getTargetPosition 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

getTargetPV

public <T extends CalculusFieldElement<T>> TimeStampedFieldPVCoordinates<T> getTargetPV(FieldPVCoordinatesProvider<T> pvProv,
                                                                                        FieldAbsoluteDate<T> date,
                                                                                        Frame frame)

Compute the target point position/velocity in specified frame.

Specified by:

getTargetPV in class GroundPointing

Type Parameters:

T - type of the field 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

getTargetPVViaInterpolation

public <T extends CalculusFieldElement<T>> TimeStampedFieldPVCoordinates<T> getTargetPVViaInterpolation(FieldPVCoordinatesProvider<T> pvProv,
                                                                                                        FieldAbsoluteDate<T> date,
                                                                                                        Frame frame)

Compute target position-velocity-acceleration vector via interpolation (Field version).

Type Parameters:

T - field type

Parameters:

pvProv - PV provider

date - date

frame - frame

Returns:

target position-velocity-acceleration

getTargetPosition

protected <T extends CalculusFieldElement<T>> FieldVector3D<T> getTargetPosition(FieldPVCoordinatesProvider<T> pvProv,
                                                                                 FieldAbsoluteDate<T> date,
                                                                                 Frame frame)

Compute the target point position in specified frame.

Overrides:

getTargetPosition in class GroundPointing

Type Parameters:

T - type of the field 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 in specified frame