Package org.orekit.attitudes

Class Attitude

  • 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

    • Constructor Detail

      • Attitude

        public Attitude​(Frame referenceFrame,
                TimeStampedAngularCoordinates orientation)
        Creates a new instance.
        Parameters:
        referenceFrame - reference frame from which attitude is defined
        orientation - complete orientation between reference frame and satellite frame, including rotation rate

      • Attitude

        public Attitude​(AbsoluteDate date,
                Frame referenceFrame,
                AngularCoordinates orientation)
        Creates a new instance.
        Parameters:
        date - date at which attitude is defined
        referenceFrame - reference frame from which attitude is defined
        orientation - complete orientation between reference frame and satellite frame, including rotation rate

      • Attitude

        public Attitude​(AbsoluteDate date,
                Frame referenceFrame,
                Rotation attitude,
                Vector3D spin,
                Vector3D acceleration)
        Creates a new instance.
        Parameters:
        date - date at which attitude is defined
        referenceFrame - reference frame from which attitude is defined
        attitude - rotation between reference frame and satellite frame
        spin - satellite spin (axis and velocity, in satellite frame)
        acceleration - satellite rotation acceleration (in satellite frame)

    • Method Detail

      • 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 interface TimeShiftable<Attitude>
        Parameters:
        dt - time shift in seconds
        Returns:
        a new attitude, shifted with respect to the instance (which is immutable)

      • shiftedBy

        public Attitude shiftedBy​(TimeOffset 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 interface TimeShiftable<Attitude>
        Parameters:
        dt - time shift
        Returns:
        a new attitude, shifted with respect to the instance (which is immutable)
        Since:
        13.0

      • 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

      • getDate

        public AbsoluteDate getDate()
        Get the date of attitude parameters.
        Specified by:
        getDate in interface TimeStamped
        Returns:
        date of the attitude parameters

      • getReferenceFrame

        public Frame getReferenceFrame()
        Get the reference frame.
        Returns:
        referenceFrame reference frame from which attitude is defined.

      • getRotation

        public Rotation getRotation()
        Get the attitude rotation.
        Returns:
        attitude satellite rotation from reference frame.
        See Also:
        getOrientation(), getSpin()

      • 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()

      • 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()