org.orekit.attitudes
Class AbstractAttitudeEphemerisGenerator

java.lang.Object
  org.orekit.attitudes.AbstractAttitudeEphemerisGenerator

Direct Known Subclasses:

FixedStepAttitudeEphemerisGenerator, VariableStepAttitudeEphemerisGenerator

public abstract class AbstractAttitudeEphemerisGenerator
extends Object

This abstract class handles the generation of attitude ephemeris from an attitude laws sequence AttitudeLegsSequence.
The ephemeris generation can be done using a fixed time step or a variable time step, setting the generation time interval (the default value is the time interval of the sequence), and the treatment to apply to the transition points of the sequence (ignore them, compute the attitude of the initial date of the laws, compute the attitude of the initial and final date of the laws).

Since:

1.3

Version:

$Id: AbstractAttitudeEphemerisGenerator.java 15449 2016-03-01 10:15:05Z bignon $

Author:

Tiziana Sabatini

See Also:

FixedStepAttitudeEphemerisGenerator, VariableStepAttitudeEphemerisGenerator

Field Summary

static int	NO_TRANSITIONS The transition points are ignored.
protected AttitudeLegsSequence	sequence Attitude legs sequence.
static int	START_END_TRANSITIONS The start and the end point of the laws are computed.
static int	START_TRANSITIONS The start date of the laws are computed.
protected int	transitions Flag specifying what to do with the attitude laws transition points.

Constructor Summary

AbstractAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence, int transitionPoints)
Simple constructor.

Method Summary

protected abstract boolean	addLastPoint(AbsoluteDateInterval ephemerisInterval) Decide if adding the last point of the time interval to the ephemeris list.
protected abstract double	computeStep(AbsoluteDate date, AbsoluteDateInterval ephemerisInterval) Computes the step used during attitude ephemeris generation.
SortedSet<Attitude>	generateEphemeris(AbsoluteDateInterval ephemerisInterval, Frame frame) Computes attitude ephemeris using a fixed or variable time step and choosing the interval of validity.
SortedSet<Attitude>	generateEphemeris(Frame frame) Computes attitude ephemeris using a fixed or variable time step.

Methods inherited from class java.lang.Object

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

Field Detail

START_TRANSITIONS

public static final int START_TRANSITIONS

The start date of the laws are computed.

See Also:

Constant Field Values

START_END_TRANSITIONS

public static final int START_END_TRANSITIONS

The start and the end point of the laws are computed.

See Also:

Constant Field Values

NO_TRANSITIONS

public static final int NO_TRANSITIONS

The transition points are ignored.

See Also:

Constant Field Values

sequence

protected final AttitudeLegsSequence sequence

Attitude legs sequence.

transitions

protected final int transitions

Flag specifying what to do with the attitude laws transition points.

Constructor Detail

AbstractAttitudeEphemerisGenerator

public AbstractAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence,
                                          int transitionPoints)

Simple constructor.

Parameters:

legsSequence - the sequence of attitude legs.

transitionPoints - what to do with the attitude laws transition points.

Method Detail

generateEphemeris

public SortedSet<Attitude> generateEphemeris(Frame frame)
                                      throws OrekitException

Computes attitude ephemeris using a fixed or variable time step. The interval of validity coincides with the time interval of the sequence.

Parameters:

frame - the frame of the computed attitude ephemeris

Returns:

the attitude ephemeris

Throws:

OrekitException - an orekit exception

generateEphemeris

public SortedSet<Attitude> generateEphemeris(AbsoluteDateInterval ephemerisInterval,
                                             Frame frame)
                                      throws OrekitException

Computes attitude ephemeris using a fixed or variable time step and choosing the interval of validity.

Parameters:

ephemerisInterval - the interval of validity of the ephemeris

frame - the frame of the computed attitude ephemeris

Returns:

the attitude ephemeris

Throws:

OrekitException - an orekit exception

computeStep

protected abstract double computeStep(AbsoluteDate date,
                                      AbsoluteDateInterval ephemerisInterval)
                               throws OrekitException

Computes the step used during attitude ephemeris generation.

Parameters:

date - the date

ephemerisInterval - the interval of validity of the ephemeris

Returns:

the computed step

Throws:

OrekitException - an orekit exception

addLastPoint

protected abstract boolean addLastPoint(AbsoluteDateInterval ephemerisInterval)

Decide if adding the last point of the time interval to the ephemeris list.

Parameters:

ephemerisInterval - the interval of validity of the ephemeris.

Returns:

true if the attitude at the last point has to be computed.