Class Attitude
- java.lang.Object
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- org.orekit.attitudes.Attitude
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- All Implemented Interfaces:
Serializable
,TimeShiftable<Attitude>
,TimeStamped
public class Attitude extends Object implements TimeStamped, TimeShiftable<Attitude>, Serializable
This class handles attitude definition at a given date.This class represents the rotation between a reference frame and the satellite frame, as well as the spin of the satellite (axis and rotation rate).
The state can be slightly shifted to close dates. This shift is based on a linear extrapolation for attitude taking the spin rate into account. It is not intended as a replacement for proper attitude propagation but should be sufficient for either small time shifts or coarse accuracy.
The instance
Attitude
is guaranteed to be immutable.- Author:
- Véronique Pommier-Maurussane
- See Also:
Orbit
,AttitudeProvider
, Serialized Form
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Constructor Summary
Constructors Constructor Description Attitude(Frame referenceFrame, TimeStampedAngularCoordinates orientation)
Creates a new instance.Attitude(AbsoluteDate date, Frame referenceFrame, Rotation attitude, Vector3D spin, Vector3D acceleration)
Creates a new instance.Attitude(AbsoluteDate date, Frame referenceFrame, AngularCoordinates orientation)
Creates a new instance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description AbsoluteDate
getDate()
Get the date of attitude parameters.TimeStampedAngularCoordinates
getOrientation()
Get the complete orientation including spin.Frame
getReferenceFrame()
Get the reference frame.Rotation
getRotation()
Get the attitude rotation.Vector3D
getRotationAcceleration()
Get the satellite rotation acceleration.Vector3D
getSpin()
Get the satellite spin.Attitude
shiftedBy(double dt)
Get a time-shifted attitude.Attitude
withReferenceFrame(Frame newReferenceFrame)
Get a similar attitude with a specific reference frame.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.orekit.time.TimeStamped
durationFrom
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Constructor Detail
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Attitude
public Attitude(Frame referenceFrame, TimeStampedAngularCoordinates orientation)
Creates a new instance.- Parameters:
referenceFrame
- reference frame from which attitude is definedorientation
- complete orientation between reference frame and satellite frame, including rotation rate
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Attitude
public Attitude(AbsoluteDate date, Frame referenceFrame, AngularCoordinates orientation)
Creates a new instance.- Parameters:
date
- date at which attitude is definedreferenceFrame
- reference frame from which attitude is definedorientation
- complete orientation between reference frame and satellite frame, including rotation rate
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Attitude
public Attitude(AbsoluteDate date, Frame referenceFrame, Rotation attitude, Vector3D spin, Vector3D acceleration)
Creates a new instance.- Parameters:
date
- date at which attitude is definedreferenceFrame
- reference frame from which attitude is definedattitude
- rotation between reference frame and satellite framespin
- satellite spin (axis and velocity, in satellite frame)acceleration
- satellite rotation acceleration (in satellite frame)
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Method Detail
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shiftedBy
public Attitude shiftedBy(double dt)
Get a time-shifted attitude.The state can be slightly shifted to close dates. This shift is based on a linear extrapolation for attitude taking the spin rate into account. It is not intended as a replacement for proper attitude propagation but should be sufficient for either small time shifts or coarse accuracy.
- Specified by:
shiftedBy
in interfaceTimeShiftable<Attitude>
- Parameters:
dt
- time shift in seconds- Returns:
- a new attitude, shifted with respect to the instance (which is immutable)
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withReferenceFrame
public Attitude withReferenceFrame(Frame newReferenceFrame)
Get a similar attitude with a specific reference frame.If the instance reference frame is already the specified one, the instance itself is returned without any object creation. Otherwise, a new instance will be created with the specified reference frame. In this case, the required intermediate rotation and spin between the specified and the original reference frame will be inserted.
- Parameters:
newReferenceFrame
- desired reference frame for attitude- Returns:
- an attitude that has the same orientation and motion as the instance, but guaranteed to have the specified reference frame
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getDate
public AbsoluteDate getDate()
Get the date of attitude parameters.- Specified by:
getDate
in interfaceTimeStamped
- Returns:
- date of the attitude parameters
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getReferenceFrame
public Frame getReferenceFrame()
Get the reference frame.- Returns:
- referenceFrame reference frame from which attitude is defined.
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getOrientation
public TimeStampedAngularCoordinates getOrientation()
Get the complete orientation including spin.- Returns:
- complete orientation including spin
- See Also:
getRotation()
,getSpin()
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getRotation
public Rotation getRotation()
Get the attitude rotation.- Returns:
- attitude satellite rotation from reference frame.
- See Also:
getOrientation()
,getSpin()
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getSpin
public Vector3D getSpin()
Get the satellite spin.The spin vector is defined in satellite frame.
- Returns:
- spin satellite spin (axis and velocity).
- See Also:
getOrientation()
,getRotation()
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getRotationAcceleration
public Vector3D getRotationAcceleration()
Get the satellite rotation acceleration.The rotation acceleration. vector is defined in satellite frame.
- Returns:
- rotation acceleration
- See Also:
getOrientation()
,getRotation()
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