org.orekit.attitudes

Class SpinStabilized

java.lang.Object

org.orekit.attitudes.SpinStabilized

All Implemented Interfaces:

Serializable, AttitudeProvider, AttitudeProviderModifier

public class SpinStabilized
extends Object
implements AttitudeProviderModifier

This class handles a spin stabilized attitude provider.

Spin stabilized laws are handled as wrappers for an underlying non-rotating law. This underlying law is typically an instance of CelestialBodyPointed with the pointing axis equal to the rotation axis, but can in fact be anything.

Instances of this class are guaranteed to be immutable.

Author:

Luc Maisonobe

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SpinStabilized(AttitudeProvider nonRotatingLaw, AbsoluteDate start, Vector3D axis, double rate) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
Attitude	getAttitude(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame) Compute the attitude corresponding to an orbital state.
AttitudeProvider	getUnderlyingAttitudeProvider() Get the underlying attitude provider.

Methods inherited from class java.lang.Object

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

Constructor Detail

SpinStabilized

public SpinStabilized(AttitudeProvider nonRotatingLaw,
                      AbsoluteDate start,
                      Vector3D axis,
                      double rate)

Creates a new instance.

Parameters:

nonRotatingLaw - underlying non-rotating attitude provider

start - start date of the rotation

axis - rotation axis in satellite frame

rate - spin rate in radians per seconds

Method Detail

getUnderlyingAttitudeProvider

public AttitudeProvider getUnderlyingAttitudeProvider()

Get the underlying attitude provider.

Specified by:

getUnderlyingAttitudeProvider in interface AttitudeProviderModifier

Returns:

underlying attitude provider

getAttitude

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

Compute the attitude corresponding to an orbital state.

Specified by:

getAttitude in interface AttitudeProvider

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