org.orekit.attitudes
Class VariableStepAttitudeEphemerisGenerator

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

public class VariableStepAttitudeEphemerisGenerator
extends AbstractAttitudeEphemerisGenerator

This class handles the generation of attitude ephemeris from an attitude laws sequence AttitudeLegsSequence, using a variable 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: VariableStepAttitudeEphemerisGenerator.java 8434 2013-04-10 15:34:31Z SabatiniT $

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

VariableStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence, double stepMin, double stepMax, double angDistMax)
Builds an attitude ephemeris generator using a variable time step and ignoring the attitude law transition points of the sequence.

VariableStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence, double stepMin, double stepMax, double angDistMax, int transitions)
Builds an attitude ephemeris generator using a variable 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 the variable step 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

VariableStepAttitudeEphemerisGenerator

public VariableStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence,
                                              double stepMin,
                                              double stepMax,
                                              double angDistMax)

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

Parameters:

legsSequence - the sequence of attitude legs.

stepMin - the minimum time step

stepMax - the maximum time step

angDistMax - the maximum allowed angular distance between two consecutive attitude ephemeris

VariableStepAttitudeEphemerisGenerator

public VariableStepAttitudeEphemerisGenerator(AttitudeLegsSequence legsSequence,
                                              double stepMin,
                                              double stepMax,
                                              double angDistMax,
                                              int transitions)

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

Parameters:

legsSequence - the sequence of attitude legs.

stepMin - the minimum time step

stepMax - the maximum time step

angDistMax - the maximum allowed angular distance between two consecutive attitude ephemeris

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

Computes the step used during the variable step ephemeris generation.

Specified by:

computeStep in class AbstractAttitudeEphemerisGenerator

Parameters:

date - the initial 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.