fr.cnes.sirius.patrius.propagation.precomputed

Class Ephemeris

java.lang.Object

fr.cnes.sirius.patrius.propagation.AbstractPropagator

fr.cnes.sirius.patrius.propagation.precomputed.Ephemeris

All Implemented Interfaces:

PVCoordinatesProvider, BoundedPropagator, Propagator, SpacecraftStateProvider, Serializable

public class Ephemeris
extends AbstractPropagator
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.

Author:

Fabien Maussion, Véronique Pommier-Maurussane, Luc Maisonobe

See Also:

Serialized Form

Field Summary

Fields inherited from class fr.cnes.sirius.patrius.propagation.AbstractPropagator

MASS

Fields inherited from interface fr.cnes.sirius.patrius.propagation.Propagator

EPHEMERIS_GENERATION_MODE, MASTER_MODE, SLAVE_MODE

Constructor Summary

Constructors

Constructor and Description
Ephemeris(List<SpacecraftState> states, int interpolationPoints) Constructor with tabulated states.

Method Summary

Modifier and Type	Method and Description
SpacecraftState	basicPropagate(AbsoluteDate date) Propagate an orbit without any fancy features.
Orbit	basicPropagateOrbit(AbsoluteDate date) Propagate an orbit without any fancy features.
SpacecraftState	getInitialState() Get the propagator initial state.
AbsoluteDate	getMaxDate() Get the last date of the range.
AbsoluteDate	getMinDate() Get the first date of the range.
PVCoordinates	getPVCoordinates(AbsoluteDate date, Frame frame) Default implementation for PVCoordinatesProvider feature using the SpacecraftState object's orbit.
SpacecraftState	getSpacecraftState(AbsoluteDate date) Get the SpacecraftState at provided date.
protected Orbit	propagateOrbit(AbsoluteDate date) Extrapolate an orbit up to a specific target date.
void	resetInitialState(SpacecraftState state) Try (and fail) to reset the initial state.

Methods inherited from class fr.cnes.sirius.patrius.propagation.AbstractPropagator

acceptStep, addAdditionalStateProvider, addAdditionalStateProvider, addEventDetector, clearEventsDetectors, getAttitudeProvider, getAttitudeProviderEvents, getAttitudeProviderForces, getEventsDetectors, getFrame, getGeneratedEphemeris, getMode, getPvProvider, manageStateFrame, propagate, propagate, setAttitudeProvider, setAttitudeProviderEvents, setAttitudeProviderForces, setEphemerisMode, setMasterMode, setMasterMode, setOrbitFrame, setSlaveMode, setStartDate

Methods inherited from class java.lang.Object

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

Methods inherited from interface fr.cnes.sirius.patrius.propagation.BoundedPropagator

setOrbitFrame

Methods inherited from interface fr.cnes.sirius.patrius.propagation.Propagator

addEventDetector, clearEventsDetectors, getAttitudeProvider, getAttitudeProviderEvents, getAttitudeProviderForces, getEventsDetectors, getFrame, getGeneratedEphemeris, getMode, getNativeFrame, propagate, propagate, setAttitudeProvider, setAttitudeProviderEvents, setAttitudeProviderForces, setEphemerisMode, setMasterMode, setMasterMode, setSlaveMode

Constructor Detail

Ephemeris

public Ephemeris(List<SpacecraftState> states,
                 int interpolationPoints)

Constructor with tabulated states.

Parameters:

states - tabulates states

interpolationPoints - number of points to use in interpolation

Throws:

MathIllegalArgumentException - if the number of states is smaller than the number of points to use in interpolation

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

basicPropagate

public SpacecraftState basicPropagate(AbsoluteDate date)
                               throws PropagationException

Description copied from class: AbstractPropagator

Propagate an orbit without any fancy features.

This method is similar in spirit to the AbstractPropagator.propagate(fr.cnes.sirius.patrius.time.AbsoluteDate) method, except that it does not call any handler during propagation, nor any discrete events. It always stop exactly at the specified date.

Overrides:

basicPropagate in class AbstractPropagator

Parameters:

date - target date for propagation

Returns:

state at specified date

Throws:

PropagationException - if propagation cannot reach specified date

basicPropagateOrbit

public Orbit basicPropagateOrbit(AbsoluteDate date)
                          throws PropagationException

Propagate an orbit without any fancy features.

This method is similar in spirit to the AbstractPropagator.propagate(fr.cnes.sirius.patrius.time.AbsoluteDate) method, except that it does not call any handler during propagation, nor any discrete events. It always stop exactly at the specified date.

Parameters:

date - target date for propagation

Returns:

orbit at specific date

Throws:

PropagationException - if entries are not chronologically sorted or if new data cannot be generated if the sample points are inconsistent

propagateOrbit

protected Orbit propagateOrbit(AbsoluteDate date)
                        throws PropagationException

Extrapolate an orbit up to a specific target date.

Specified by:

propagateOrbit in class AbstractPropagator

Parameters:

date - target date for the orbit

Returns:

extrapolated parameters

Throws:

PropagationException - if some parameters are out of bounds

getPVCoordinates

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

Default implementation for PVCoordinatesProvider feature using the SpacecraftState object's orbit.

Get the PVCoordinates of the body in the selected frame.

Specified by:

getPVCoordinates in interface PVCoordinatesProvider

Specified by:

getPVCoordinates in interface SpacecraftStateProvider

Overrides:

getPVCoordinates in class AbstractPropagator

Parameters:

date - current date

frame - the frame where to define the position

Returns:

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

Throws:

PatriusException - if position cannot be computed in given frame

getSpacecraftState

public SpacecraftState getSpacecraftState(AbsoluteDate date)
                                   throws PropagationException

Get the SpacecraftState at provided date.

Specified by:

getSpacecraftState in interface SpacecraftStateProvider

Overrides:

getSpacecraftState in class AbstractPropagator

Parameters:

date - target date

Returns:

spacecraft state

Throws:

PropagationException - if state cannot be computed

resetInitialState

public void resetInitialState(SpacecraftState state)
                       throws PropagationException

Try (and fail) to reset the initial state.

This method always throws an exception, as ephemerides cannot be reset.

Specified by:

resetInitialState in interface Propagator

Overrides:

resetInitialState in class AbstractPropagator

Parameters:

state - new initial state to consider

Throws:

PropagationException - always thrown as ephemerides cannot be reset

getInitialState

public SpacecraftState getInitialState()
                                throws PropagationException

Get the propagator initial state.

Specified by:

getInitialState in interface Propagator

Overrides:

getInitialState in class AbstractPropagator

Returns:

initial state

Throws:

PropagationException