org.orekit.attitudes
Class TwoDirectionsAttitude

java.lang.Object
  org.orekit.attitudes.AbstractAttitudeLaw
      org.orekit.attitudes.TwoDirectionsAttitude

All Implemented Interfaces:

Serializable, AttitudeLaw, AttitudeProvider

Direct Known Subclasses:

SunPointing

public class TwoDirectionsAttitude
extends AbstractAttitudeLaw

This class implements a generic two directions attitude law. The first direction is aligned with a given satellite axis, the second direction is aligned at best with another given satellite axis.

Since:

1.2

Version:

$Id: TwoDirectionsAttitude.java 17582 2017-05-10 12:58:16Z bignon $

Author:

Julie Anton

See Also:

IDirection, Serialized Form

Concurrency :

unconditionally thread safe

Constructor Summary

TwoDirectionsAttitude(IDirection firstDirection, IDirection secondDirection, Vector3D firstAxis, Vector3D secondAxis)
Constructor with default step values for spin and spin derivatives computation using finite differences (0.2s for spin, 0.001s for spin derivative).

TwoDirectionsAttitude(IDirection firstDirection, IDirection secondDirection, Vector3D firstAxis, Vector3D secondAxis, double dtSpin, double dtAcc)
Constructor.

Method Summary

Attitude

getAttitude(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the attitude corresponding to an orbital state.

Methods inherited from class org.orekit.attitudes.AbstractAttitudeLaw

getAttitude, getSpinDerivativesComputation, setSpinDerivativesComputation

Methods inherited from class java.lang.Object

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

Constructor Detail

TwoDirectionsAttitude

public TwoDirectionsAttitude(IDirection firstDirection,
                             IDirection secondDirection,
                             Vector3D firstAxis,
                             Vector3D secondAxis)

Constructor with default step values for spin and spin derivatives computation using finite differences (0.2s for spin, 0.001s for spin derivative).

Parameters:

firstDirection - first direction

secondDirection - second direction

firstAxis - satellite axis that has to be aligned with the fisrt direction

secondAxis - satellite axis that has to be aligned at best with the second direction

TwoDirectionsAttitude

public TwoDirectionsAttitude(IDirection firstDirection,
                             IDirection secondDirection,
                             Vector3D firstAxis,
                             Vector3D secondAxis,
                             double dtSpin,
                             double dtAcc)

Constructor.

Parameters:

firstDirection - first direction

secondDirection - second direction

firstAxis - satellite axis that has to be aligned with the fisrt direction

secondAxis - satellite axis that has to be aligned at best with the second direction

dtSpin - step for finite differences spin computation

dtAcc - step for finite differences spin derivative computation

Method Detail

getAttitude

public Attitude getAttitude(PVCoordinatesProvider pvProv,
                            AbsoluteDate date,
                            Frame frame)
                     throws OrekitException

Compute the attitude corresponding to an orbital state.

Parameters:

pvProv - local position-velocity provider around current date

date - current date

frame - reference frame from which attitude is computed

Returns:

attitude attitude on the specified date and position-velocity state

Throws:

OrekitException - if attitude cannot be computed