org.orekit.attitudes
Class FixedStepAttitudeEphemerisGenerator

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

public final class FixedStepAttitudeEphemerisGenerator
extends AbstractAttitudeEphemerisGenerator

This class handles the generation of attitude ephemeris from an attitude laws sequence AttitudeLegsSequence, using a fixed time step.
The ephemeris generation can be done 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: FixedStepAttitudeEphemerisGenerator.java 8580 2013-04-22 08:32:59Z ClaudeD $

Author:

Tiziana Sabatini

Concurrency :

not thread-safe

Concurrency comment :

The AttitudeLegsSequence attribute is mutable.

Field Summary

Fields inherited from class org.orekit.attitudes.AbstractAttitudeEphemerisGenerator

NO_TRANSITIONS, sequence, START_END_TRANSITIONS, START_TRANSITIONS, transitions

Constructor Summary

FixedStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence, double fixedStep)
Builds an attitude ephemeris generator using a fixed time step and ignoring the attitude law transition points of the sequence.

FixedStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence, double fixedStep, int transitions)
Builds an attitude ephemeris generator using a fixed time step and choosing the treatment to apply to the transition points of the sequence.

Method Summary

protected boolean	addLastPoint(AbsoluteDateInterval ephemerisInterval) Decide if adding the last point of the time interval to the ephemeris list.
protected double	computeStep(AbsoluteDate date, AbsoluteDateInterval ephemerisInterval) Computes the step used during attitude ephemeris generation.

Methods inherited from class org.orekit.attitudes.AbstractAttitudeEphemerisGenerator

generateEphemeris, generateEphemeris

Methods inherited from class java.lang.Object

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

Constructor Detail

FixedStepAttitudeEphemerisGenerator

public FixedStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence,
                                           double fixedStep)

Builds an attitude ephemeris generator using a fixed time step and ignoring the attitude law transition points of the sequence.

Parameters:

legsSequence - the sequence of attitude legs.

fixedStep - the fixed time step.

FixedStepAttitudeEphemerisGenerator

public FixedStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence,
                                           double fixedStep,
                                           int transitions)

Builds an attitude ephemeris generator using a fixed time step and choosing the treatment to apply to the transition points of the sequence.

Parameters:

legsSequence - the sequence of attitude legs.

fixedStep - the fixed time step

transitions - what to do with the attitude laws transition points:

• AbstractAttitudeEphemerisGenerator.NO_TRANSITIONS to ignore the transition points of the sequence
• AbstractAttitudeEphemerisGenerator.START_TRANSITIONS to compute the initial dates of the attitude laws
• AbstractAttitudeEphemerisGenerator.START_END_TRANSITIONS to compute the initial and final dates of the attitude laws.

Method Detail

computeStep

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

Description copied from class: AbstractAttitudeEphemerisGenerator

Computes the step used during attitude ephemeris generation.

Specified by:

computeStep in class AbstractAttitudeEphemerisGenerator

Parameters:

date - the date

ephemerisInterval - the interval of validity of the ephemeris

Returns:

the computed step

Throws:

OrekitException - an orekit exception

addLastPoint

protected boolean addLastPoint(AbsoluteDateInterval ephemerisInterval)

Description copied from class: AbstractAttitudeEphemerisGenerator

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

Specified by:

addLastPoint in class AbstractAttitudeEphemerisGenerator

Parameters:

ephemerisInterval - the interval of validity of the ephemeris.

Returns:

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