org.orekit.utils
Class EphemerisPvLagrange

java.lang.Object
  org.orekit.utils.AbstractBoundedPVProvider
      org.orekit.utils.EphemerisPvLagrange

All Implemented Interfaces:

PVCoordinatesProvider

public class EphemerisPvLagrange
extends AbstractBoundedPVProvider

This class extends AbstractBoundedPVProvider which implements PVCoordinatesProvider and so provides a position velocity for a given date. The provided position velocity is based on a Lagrange interpolation in a given position velocity ephemeris. Tabulated entries are chronologically classified.

The interpolation extracts points from the ephemeris depending on the polynom order and the date to interpolate. Points extraction is based on an implementation of the ISearchIndex interface. This implementation should be based on a table of duration created from the date table with the duration = 0 at the first index.

Since:

3.1

Version:

$Id: EphemerisPvLagrange.java 14807 2015-12-02 15:29:49Z bignon $

Author:

chabaudp

Concurrency :

not thread-safe

Concurrency comment :

internal mutable attributes

Field Summary

Fields inherited from class org.orekit.utils.AbstractBoundedPVProvider

tDate, tPVCoord

Constructor Summary

EphemerisPvLagrange(PVCoordinates[] tabPV, int order, Frame frame, AbsoluteDate[] tabDate, ISearchIndex algo)
Creates an instance of EphemerisPvLagrange

EphemerisPvLagrange(SpacecraftState[] tabState, int order, ISearchIndex algo)
Creates an instance of EphemerisPvLagrange from a spacecraftstate list

Method Summary

AbsoluteDate	getMaxDate() Return the higher date authorized to call getPVCoordinates.
AbsoluteDate	getMinDate() Return the lower date authorized to call getPVCoordinates.
PVCoordinates	getPVCoordinates(AbsoluteDate date, Frame frame) Frame can be null : by default the frame of expression is the frame used at instantiation (which is the frame of the first spacecraft state when instantiation is done from a table of spacecraft states).

Methods inherited from class org.orekit.utils.AbstractBoundedPVProvider

getDateRef, getFrame, getPreviousIndex, getSearchIndex, setPreviousIndex

Methods inherited from class java.lang.Object

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

Constructor Detail

EphemerisPvLagrange

public EphemerisPvLagrange(PVCoordinates[] tabPV,
                           int order,
                           Frame frame,
                           AbsoluteDate[] tabDate,
                           ISearchIndex algo)

Creates an instance of EphemerisPvLagrange

Parameters:

tabPV - position velocity coordinates table

order - lagrange polynome order

frame - coordinates expression frame

tabDate - table of dates for each position velocity

algo - class to find the nearest date index from a given date in the date table. (If null, algo will be BinarySearchIndexOpenClosed by default based on a table of duration since the first date of the dates table)

Throws:

IllegalArgumentException - if parameters are not consistent

EphemerisPvLagrange

public EphemerisPvLagrange(SpacecraftState[] tabState,
                           int order,
                           ISearchIndex algo)

Creates an instance of EphemerisPvLagrange from a spacecraftstate list

Parameters:

tabState - Spacecraftstate list

order - lagrange polynome order

algo - class to find the nearest date index from a given date in the date table (If null, algo will be BinarySearchIndexOpenClosed by default based on a table of duration since the first date of the dates table)

Throws:

IllegalArgumentException - if parameters are not consistent

Method Detail

getPVCoordinates

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

Frame can be null : by default the frame of expression is the frame used at instantiation (which is the frame of the first spacecraft state when instantiation is done from a table of spacecraft states).

Parameters:

date - date of interpolation

frame - frame of coordinates expression. (can be null)

Returns:

PVcoordinates at interpolation date in the chosen frame

Throws:

OrekitException - if date of interpolation is too near from min and max input dates compare to Lagrange order

See Also:

PVCoordinatesProvider.getPVCoordinates(org.orekit.time.AbsoluteDate, org.orekit.frames.Frame)

getMinDate

public AbsoluteDate getMinDate()

Return the lower date authorized to call getPVCoordinates.

Specified by:

getMinDate in class AbstractBoundedPVProvider

Returns:

minimum ephemeris date

getMaxDate

public AbsoluteDate getMaxDate()

Return the higher date authorized to call getPVCoordinates.

Specified by:

getMaxDate in class AbstractBoundedPVProvider

Returns:

maximum ephemeris date