Package org.orekit.propagation.relative.clohessywiltshire

Class ClohessyWiltshireMatrices

java.lang.Object

org.orekit.propagation.relative.clohessywiltshire.ClohessyWiltshireMatrices

public class ClohessyWiltshireMatrices
extends Object

This class stores the 4 sub-matrices of the 6x6 state transition matrix of the Clohessy-Wiltshire equations.

Since:

14.0

Author:

Jérôme Tabeaud, Romain Cuvillon

Constructor Summary

Constructors

Constructor	Description
ClohessyWiltshireMatrices(double timeSinceEpoch, RealMatrix phiRR, RealMatrix phiRV, RealMatrix phiVR, RealMatrix phiVV)	Constructor of the 4 sub-matrices of the 6x6 state transition matrix of the Clohessy-Wiltshire equations.

Method Summary

Modifier and Type	Method	Description
RealMatrix	getPhiRR()	Get the sub-matrix of the transition matrix φrr(t).
RealMatrix	getPhiRV()	Get the sub-matrix of the transition matrix φrv(t).
RealMatrix	getPhiVR()	Get the sub-matrix of the transition matrix φvr(t).
RealMatrix	getPhiVV()	Get the sub-matrix of the transition matrix φvv(t).
PVCoordinates	transform(PVCoordinates pv)	Transforms the input initial PV expressed in the target's QSW LOF to the PV at the time encoded in the Clohessy-Wiltshire matrices contained in the object.
TimeStampedPVCoordinates	transform(TimeStampedPVCoordinates pvt)	Transforms the input initial PVT expressed in the target's QSW LOF to the PVT at the time encoded in the Clohessy-Wiltshire matrices contained in the object.

Methods inherited from class java.lang.Object

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

Constructor Details

ClohessyWiltshireMatrices

public ClohessyWiltshireMatrices(double timeSinceEpoch,
 RealMatrix phiRR,
 RealMatrix phiRV,
 RealMatrix phiVR,
 RealMatrix phiVV)

Constructor of the 4 sub-matrices of the 6x6 state transition matrix of the Clohessy-Wiltshire equations.

δr(t) = φ_rr(t) δr₀ + φ_rv(t) δv₀

δv(t) = φ_vr(t) δr₀ + φ_vv(t) δv₀

Parameters:

timeSinceEpoch - duration in seconds since epoch

phiRR - position to position transition sub-matrix

phiRV - velocity to position transition sub-matrix

phiVR - position to velocity transition sub-matrix

phiVV - velocity to velocity transition sub-matrix

Method Details

getPhiRR

public RealMatrix getPhiRR()

Get the sub-matrix of the transition matrix φ_rr(t).

Returns:

φ_rr(t) sub-matrix

getPhiRV

public RealMatrix getPhiRV()

Get the sub-matrix of the transition matrix φ_rv(t).

Returns:

φ_rv(t) sub-matrix

getPhiVR

public RealMatrix getPhiVR()

Get the sub-matrix of the transition matrix φ_vr(t).

Returns:

φ_vr(t) sub-matrix

getPhiVV

public RealMatrix getPhiVV()

Get the sub-matrix of the transition matrix φ_vv(t).

Returns:

φ_vv(t) sub-matrix

transform

public TimeStampedPVCoordinates transform(TimeStampedPVCoordinates pvt)

Transforms the input initial PVT expressed in the target's QSW LOF to the PVT at the time encoded in the Clohessy-Wiltshire matrices contained in the object.

pos(t) = Φrr * pos(0) + Φrv * vel(0)

vel(t) = Φvr * pos(0) + Φvv * vel(0)

Parameters:

pvt - input initial PVT expressed in the target's QSW LOF.

Returns:

PVT at the time encoded in the Clohessy-Wiltshire matrices, expressed in the target's QSW LOF.

transform

public PVCoordinates transform(PVCoordinates pv)

Transforms the input initial PV expressed in the target's QSW LOF to the PV at the time encoded in the Clohessy-Wiltshire matrices contained in the object.

pos(t) = Φrr * pos(0) + Φrv * vel(0)

vel(t) = Φvr * pos(0) + Φvv * vel(0)

Parameters:

pv - input initial PV expressed in the target's QSW LOF.

Returns:

PV at the time encoded in the Clohessy-Wiltshire matrices, expressed in the target's QSW LOF.