LyapunovOrbit.java
/* Copyright 2002-2020 CS GROUP
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* CS licenses this file to You under the Apache License, Version 2.0
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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package org.orekit.orbits;
import org.orekit.bodies.CR3BPSystem;
import org.orekit.utils.PVCoordinates;
/** Class calculating different parameters of a Lyapunov Orbit.
* @author Vincent Mouraux
* @since 10.2
*/
public class LyapunovOrbit extends LibrationOrbit {
/**
* Simple Constructor.
* <p>
* This constructor can be used if the user wants to use a first guess from
* any other sources or if he has the initial conditions of a well defined Lyapunov Orbit.
* In that case, it is assumed that the user knows the
* characteristics of the Lyapunov Orbit leading to this first guess/point. Also, the
* orbital period of this Lyapunov Orbit has to be specified for further
* computation.
* </p>
* @param syst CR3BP System considered
* @param pv PVCoordinates of the initial point or of the first guess
* @param orbitalPeriod Normalized orbital period linked to the given Lyapunov Orbit first guess
*/
public LyapunovOrbit(final CR3BPSystem syst,
final PVCoordinates pv, final double orbitalPeriod) {
super(syst, pv, orbitalPeriod);
}
/**
* Simple Constructor.
* <p>
* Standard constructor, the first guess will be computed with both start
* time and phase equal to zero.
* </p>
* @param richardson third-Order Richardson Expansion
* @param ay y-axis amplitude of the required Lyapunov Orbit, meters
*/
public LyapunovOrbit(final RichardsonExpansion richardson,
final double ay) {
super(richardson.getCr3bpSystem(),
richardson.computeLyapunovFirstGuess(ay, 0.0, 0.0),
richardson.getLyapunovOrbitalPeriod(ay));
}
/** {@inheritDoc} */
@Override
protected PVCoordinates applyCorrectionOnPV(final CR3BPDifferentialCorrection diff) {
return diff.compute(LibrationOrbitType.LYAPUNOV);
}
}