org.orekit.attitudes
Class IsisSunPointing

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

All Implemented Interfaces:

Serializable, AttitudeLaw, AttitudeProvider

public class IsisSunPointing
extends AbstractAttitudeLaw

Implementation of ISIS Sun pointing attitude law. This class implements AttitudeProvider, so the associated service AttitudeProvider.getAttitude(PVCoordinatesProvider, AbsoluteDate, Frame) is available. ISIS Sun pointing law corresponds to an ordered attitude matching with the Sun axis (X_sun, Y_sun, Z_sun) computed in GCRF frame by specific formulae.

Since:

3.3

Version:

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

Author:

rodriguest

See Also:

Serialized Form

Concurrency :

not thread-safe

Constructor Summary

IsisSunPointing(CelestialBody sunBody)
Build a new instance of the class.

IsisSunPointing(IDirection sunDir)
Build a new instance of the class.

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

IsisSunPointing

public IsisSunPointing(IDirection sunDir)
                throws OrekitException

Build a new instance of the class.

Parameters:

sunDir - the Sun direction in the inertial frame

Throws:

OrekitException - if the Sun cannot be built

IsisSunPointing

public IsisSunPointing(CelestialBody sunBody)

Build a new instance of the class.

Parameters:

sunBody - the Sun body.

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