Package org.orekit.utils

Class AbsolutePVCoordinates

java.lang.Object

org.orekit.utils.AbsolutePVCoordinates

All Implemented Interfaces:

TimeShiftable<ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>>, TimeStamped, PVCoordinatesProvider, ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>

public class AbsolutePVCoordinates
extends Object
implements ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>, PVCoordinatesProvider

Position - Velocity - Acceleration linked to a date and a frame.

Constructor Summary

Constructors

Constructor	Description
AbsolutePVCoordinates(Frame frame, AbsoluteDate date, FieldVector3D<U> p)	Builds a AbsolutePVCoordinates triplet from a FieldVector3D<Derivative>.
AbsolutePVCoordinates(Frame frame, AbsoluteDate date, Vector3D position, Vector3D velocity)	Build from position and velocity.
AbsolutePVCoordinates(Frame frame, AbsoluteDate date, Vector3D position, Vector3D velocity, Vector3D acceleration)	Build from position, velocity, acceleration.
AbsolutePVCoordinates(Frame frame, AbsoluteDate date, PVCoordinates pva)	Build from frame, date and PVA coordinates.
AbsolutePVCoordinates(Frame frame, TimeStampedPVCoordinates pva)	Build from frame and TimeStampedPVCoordinates.
AbsolutePVCoordinates(AbsoluteDate date, double a, AbsolutePVCoordinates absPva)	Multiplicative constructor
AbsolutePVCoordinates(AbsoluteDate date, double a1, AbsolutePVCoordinates absPv1, double a2, AbsolutePVCoordinates absPv2)	Linear constructor
AbsolutePVCoordinates(AbsoluteDate date, double a1, AbsolutePVCoordinates absPv1, double a2, AbsolutePVCoordinates absPv2, double a3, AbsolutePVCoordinates absPv3)	Linear constructor
AbsolutePVCoordinates(AbsoluteDate date, double a1, AbsolutePVCoordinates absPv1, double a2, AbsolutePVCoordinates absPv2, double a3, AbsolutePVCoordinates absPv3, double a4, AbsolutePVCoordinates absPv4)	Linear constructor
AbsolutePVCoordinates(AbsoluteDate date, AbsolutePVCoordinates start, AbsolutePVCoordinates end)	Subtractive constructor

Method Summary

Modifier and Type	Method	Description
Vector3D	getAcceleration()	Getter for the acceleration vector.
AbsoluteDate	getDate()	Get the date.
Frame	getFrame()	Get the frame in which the coordinates are defined.
Vector3D	getPosition(AbsoluteDate otherDate, Frame outputFrame)	Get the position of the body in the selected frame.
TimeStampedPVCoordinates	getPVCoordinates()	Get the TimeStampedPVCoordinates.
AbsolutePVCoordinates	shiftedBy(double dt)	Get a time-shifted state.
AbsolutePVCoordinates	shiftedBy(TimeOffset dt)	Get a time-shifted state.
String	toString()
PVCoordinatesProvider	toTaylorProvider()	Create a local provider using simply Taylor expansion through shiftedBy(double).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.utils.ShiftablePVCoordinatesHolder

getPosition, getPosition, getPVCoordinates, getPVCoordinates, getVelocity, getVelocity, getVelocity

Methods inherited from interface org.orekit.time.TimeStamped

durationFrom

Constructor Details

AbsolutePVCoordinates

public AbsolutePVCoordinates(Frame frame,
 AbsoluteDate date,
 Vector3D position,
 Vector3D velocity,
 Vector3D acceleration)

Build from position, velocity, acceleration.

Parameters:

frame - the frame in which the coordinates are defined

date - coordinates date

position - the position vector (m)

velocity - the velocity vector (m/s)

acceleration - the acceleration vector (m/sÂý)

AbsolutePVCoordinates

public AbsolutePVCoordinates(Frame frame,
 AbsoluteDate date,
 Vector3D position,
 Vector3D velocity)

Build from position and velocity. Acceleration is set to zero.

Parameters:

frame - the frame in which the coordinates are defined

date - coordinates date

position - the position vector (m)

velocity - the velocity vector (m/s)

AbsolutePVCoordinates

public AbsolutePVCoordinates(Frame frame,
 AbsoluteDate date,
 PVCoordinates pva)

Build from frame, date and PVA coordinates.

Parameters:

frame - the frame in which the coordinates are defined

date - date of the coordinates

pva - TimeStampedPVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(Frame frame,
 TimeStampedPVCoordinates pva)

Build from frame and TimeStampedPVCoordinates.

Parameters:

frame - the frame in which the coordinates are defined

pva - TimeStampedPVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(AbsoluteDate date,
 double a,
 AbsolutePVCoordinates absPva)

Multiplicative constructor

Build a AbsolutePVCoordinates from another one and a scale factor.

The TimeStampedPVCoordinates built will be a * AbsPva

Parameters:

date - date of the built coordinates

a - scale factor

absPva - base (unscaled) AbsolutePVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(AbsoluteDate date,
 AbsolutePVCoordinates start,
 AbsolutePVCoordinates end)

Subtractive constructor

Build a relative AbsolutePVCoordinates from a start and an end position.

The AbsolutePVCoordinates built will be end - start.

In case start and end use two different pseudo-inertial frames, the new AbsolutePVCoordinates arbitrarily be defined in the start frame.

Parameters:

date - date of the built coordinates

start - Starting AbsolutePVCoordinates

end - ending AbsolutePVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(AbsoluteDate date,
 double a1,
 AbsolutePVCoordinates absPv1,
 double a2,
 AbsolutePVCoordinates absPv2)

Linear constructor

Build a AbsolutePVCoordinates from two other ones and corresponding scale factors.

The AbsolutePVCoordinates built will be a1 * u1 + a2 * u2

In case the AbsolutePVCoordinates use different pseudo-inertial frames, the new AbsolutePVCoordinates arbitrarily be defined in the first frame.

Parameters:

date - date of the built coordinates

a1 - first scale factor

absPv1 - first base (unscaled) AbsolutePVCoordinates

a2 - second scale factor

absPv2 - second base (unscaled) AbsolutePVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(AbsoluteDate date,
 double a1,
 AbsolutePVCoordinates absPv1,
 double a2,
 AbsolutePVCoordinates absPv2,
 double a3,
 AbsolutePVCoordinates absPv3)

Linear constructor

Build a AbsolutePVCoordinates from three other ones and corresponding scale factors.

The AbsolutePVCoordinates built will be a1 * u1 + a2 * u2 + a3 * u3

In case the AbsolutePVCoordinates use different pseudo-inertial frames, the new AbsolutePVCoordinates arbitrarily be defined in the first frame.

Parameters:

date - date of the built coordinates

a1 - first scale factor

absPv1 - first base (unscaled) AbsolutePVCoordinates

a2 - second scale factor

absPv2 - second base (unscaled) AbsolutePVCoordinates

a3 - third scale factor

absPv3 - third base (unscaled) AbsolutePVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(AbsoluteDate date,
 double a1,
 AbsolutePVCoordinates absPv1,
 double a2,
 AbsolutePVCoordinates absPv2,
 double a3,
 AbsolutePVCoordinates absPv3,
 double a4,
 AbsolutePVCoordinates absPv4)

Linear constructor

Build a AbsolutePVCoordinates from four other ones and corresponding scale factors.

The AbsolutePVCoordinates built will be a1 * u1 + a2 * u2 + a3 * u3 + a4 * u4

In case the AbsolutePVCoordinates use different pseudo-inertial frames, the new AbsolutePVCoordinates arbitrarily be defined in the first frame.

Parameters:

date - date of the built coordinates

a1 - first scale factor

absPv1 - first base (unscaled) AbsolutePVCoordinates

a2 - second scale factor

absPv2 - second base (unscaled) AbsolutePVCoordinates

a3 - third scale factor

absPv3 - third base (unscaled) AbsolutePVCoordinates

a4 - fourth scale factor

absPv4 - fourth base (unscaled) AbsolutePVCoordinates

AbsolutePVCoordinates

public AbsolutePVCoordinates(Frame frame,
 AbsoluteDate date,
 FieldVector3D<U> p)

Builds a AbsolutePVCoordinates triplet from a FieldVector3D<Derivative>.

The vector components must have time as their only derivation parameter and have consistent derivation orders.

Type Parameters:

U - type of the derivative

Parameters:

frame - the frame in which the parameters are defined

date - date of the built coordinates

p - vector with time-derivatives embedded within the coordinates

Method Details

shiftedBy

public AbsolutePVCoordinates shiftedBy(double dt)

Get a time-shifted state.

The state can be slightly shifted to close dates. This shift is based on a simple Taylor expansion. It is not intended as a replacement for proper orbit propagation (it is not even Keplerian!) but should be sufficient for either small time shifts or coarse accuracy.

Specified by:

shiftedBy in interface TimeShiftable<ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>>

Parameters:

dt - time shift in seconds

Returns:

a new state, shifted with respect to the instance (which is immutable)

shiftedBy

public AbsolutePVCoordinates shiftedBy(TimeOffset dt)

Get a time-shifted state.

The state can be slightly shifted to close dates. This shift is based on a simple Taylor expansion. It is not intended as a replacement for proper orbit propagation (it is not even Keplerian!) but should be sufficient for either small time shifts or coarse accuracy.

Specified by:

shiftedBy in interface TimeShiftable<ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>>

Parameters:

dt - time shift in seconds

Returns:

a new state, shifted with respect to the instance (which is immutable)

Since:

13.0

toTaylorProvider

public PVCoordinatesProvider toTaylorProvider()

Create a local provider using simply Taylor expansion through shiftedBy(double).

The time evolution is based on a simple Taylor expansion. It is not intended as a replacement for proper orbit propagation (it is not even Keplerian!) but should be sufficient for either small time shifts or coarse accuracy.

Returns:

provider based on Taylor expansion, for small time shifts around instance date

getFrame

public Frame getFrame()

Get the frame in which the coordinates are defined.

Specified by:

getFrame in interface ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>

Returns:

frame in which the coordinates are defined

getDate

public AbsoluteDate getDate()

Get the date.

Specified by:

getDate in interface TimeStamped

Returns:

date attached to the object

getPVCoordinates

public TimeStampedPVCoordinates getPVCoordinates()

Get the TimeStampedPVCoordinates.

Specified by:

getPVCoordinates in interface ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>

Returns:

TimeStampedPVCoordinates

getAcceleration

public Vector3D getAcceleration()

Getter for the acceleration vector.

Returns:

acceleration

getPosition

public Vector3D getPosition(AbsoluteDate otherDate,
 Frame outputFrame)

Get the position of the body in the selected frame.

Specified by:

getPosition in interface PVCoordinatesProvider

Specified by:

getPosition in interface ShiftablePVCoordinatesHolder<AbsolutePVCoordinates>

Parameters:

otherDate - current date

outputFrame - the frame where to define the position

Returns:

position of the body (m and)

toString

@DefaultDataContext
public String toString()

Overrides:

toString in class Object