org.orekit.propagation
Class Ephemeris

java.lang.Object
  org.orekit.propagation.Ephemeris

All Implemented Interfaces:

java.io.Serializable, BasicPropagator, BoundedPropagator, PVCoordinatesProvider

public class Ephemeris
extends java.lang.Object
implements BoundedPropagator

This class is designed to accept and handle tabulated orbital entries. Tabulated entries are classified and then extrapolated in way to obtain continuous output, with accuracy and computation methods configured by the user.

Version:

$Revision: 3194 $ $Date: 2010-04-22 18:06:37 +0200 (jeu. 22 avril 2010) $

Author:

Fabien Maussion, Véronique Pommier-Maurussane

See Also:

Serialized Form

Constructor Summary

Ephemeris(SpacecraftState[] tabulatedStates)
Constructor with tabulated entries.

Method Summary

AbsoluteDate	getMaxDate() Get the last date of the range.
AbsoluteDate	getMinDate() Get the first date of the range.
PVCoordinates	getPVCoordinates(AbsoluteDate date, Frame frame) Get the PVCoordinates of the body in the selected frame.
SpacecraftState	propagate(AbsoluteDate date) Propagate towards a target date.

Methods inherited from class java.lang.Object

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

Constructor Detail

Ephemeris

public Ephemeris(SpacecraftState[] tabulatedStates)

Constructor with tabulated entries.

Parameters:

tabulatedStates - states table

Method Detail

getMinDate

public AbsoluteDate getMinDate()

Get the first date of the range.

Specified by:

getMinDate in interface BoundedPropagator

Returns:

the first date of the range

getMaxDate

public AbsoluteDate getMaxDate()

Get the last date of the range.

Specified by:

getMaxDate in interface BoundedPropagator

Returns:

the last date of the range

propagate

public SpacecraftState propagate(AbsoluteDate date)

Propagate towards a target date.

Simple propagators use only the target date as the specification for computing the propagated state. More feature rich propagators like the ones implemented the extended interface Propagator can consider other information and provide different operating modes or G-stop facilities to stop at pinpointed events occurrences. In these cases, the target date is only a hint, not a mandatory objective.

Specified by:

propagate in interface BasicPropagator

Parameters:

date - target date towards which orbit state should be propagated

Returns:

propagated state

getPVCoordinates

public PVCoordinates getPVCoordinates(AbsoluteDate date,
                                      Frame frame)
                               throws OrekitException

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:

position/velocity of the body (m and m/s)

Throws:

OrekitException - if position cannot be computed in given frame