Package org.orekit.utils

Class ConstantPVCoordinatesProvider

java.lang.Object

org.orekit.utils.ConstantPVCoordinatesProvider

All Implemented Interfaces:

PVCoordinatesProvider

public class ConstantPVCoordinatesProvider
extends Object
implements PVCoordinatesProvider

Provider based on a single point. When getPVCoordinates(AbsoluteDate, Frame) is called, the constant point will be translated to the destination frame and returned. This behavior is different than AbsolutePVCoordinates.getPVCoordinates(AbsoluteDate, Frame) (which uses shiftedBy() internally.). Use this class when no shifting should be performed (e.g. representing a fixed point on the ground).

Since:

11.3

Author:

Joe Reed

Constructor Summary

Constructors

Constructor	Description
ConstantPVCoordinatesProvider(Vector3D pos, Frame frame)	Create the PVCoordinatesProvider from a fixed point in a frame.
ConstantPVCoordinatesProvider(GeodeticPoint pos, OneAxisEllipsoid body)	Create a the provider from a fixed lat/lon/alt on a central body.
ConstantPVCoordinatesProvider(PVCoordinates pva, Frame frame)	Create the PVCoordinatesProvider from a fixed point in a frame.

Method Summary

Modifier and Type	Method	Description
Vector3D	getPosition(AbsoluteDate date, Frame frame)	Get the position of the body in the selected frame.
TimeStampedPVCoordinates	getPVCoordinates(AbsoluteDate date, Frame frame)	Get the PVCoordinates of the body in the selected frame.
Vector3D	getVelocity(AbsoluteDate date, Frame frame)	Get the velocity of the body in the selected frame.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantPVCoordinatesProvider

public ConstantPVCoordinatesProvider(Vector3D pos,
                                     Frame frame)

Create the PVCoordinatesProvider from a fixed point in a frame.

Parameters:

pos - the fixed position in the frame

frame - the frame in which pva is defined

ConstantPVCoordinatesProvider

public ConstantPVCoordinatesProvider(GeodeticPoint pos,
                                     OneAxisEllipsoid body)

Create a the provider from a fixed lat/lon/alt on a central body. This method is provided as convienience for new ConstantPVCoordinatesProvider(body.transform(pos), body.getBodyFrame()).

Parameters:

pos - the position relative to the ellipsoid's surface

body - the reference ellipsoid

ConstantPVCoordinatesProvider

public ConstantPVCoordinatesProvider(PVCoordinates pva,
                                     Frame frame)

Create the PVCoordinatesProvider from a fixed point in a frame.

Parameters:

pva - the point in the frame

frame - the frame in which pva is defined

Method Detail

getPosition

public Vector3D getPosition(AbsoluteDate date,
                            Frame frame)

Get the position of the body in the selected frame.

Specified by:

getPosition in interface PVCoordinatesProvider

Parameters:

date - current date

frame - the frame where to define the position

Returns:

position of the body (m and)

getVelocity

public Vector3D getVelocity(AbsoluteDate date,
                            Frame frame)

Get the velocity of the body in the selected frame.

Specified by:

getVelocity in interface PVCoordinatesProvider

Parameters:

date - current date

frame - the frame where to define the velocity

Returns:

velocity of the body (m/s)

getPVCoordinates

public TimeStampedPVCoordinates getPVCoordinates(AbsoluteDate date,
                                                 Frame frame)

Get the PVCoordinates of the body in the selected frame.

Specified by:

getPVCoordinates in interface PVCoordinatesProvider

Parameters:

date - current date

frame - the frame where to define the position

Returns:

time-stamped position/velocity of the body (m and m/s)