org.orekit.rugged.los

Class FixedRotation

java.lang.Object

org.orekit.rugged.los.FixedRotation

All Implemented Interfaces:

TimeIndependentLOSTransform, ParametricModel

public class FixedRotation
extends Object
implements TimeIndependentLOSTransform

LOS transform based on a fixed rotation.

Author:

Luc Maisonobe

See Also:

LOSBuilder

Constructor Summary

Constructors

Constructor and Description
FixedRotation(ParameterType type, Vector3D axis, double angle) Simple constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	getEstimatedParameters(double[] parameters, int start, int length) Get the current values of the estimated parameters.
int	getNbEstimatedParameters() Get the number of estimated parameters.
void	setEstimatedParameters(double[] parameters, int start, int length) Set new values for the estimated parameters.
FieldVector3D<DerivativeStructure>	transformLOS(int i, FieldVector3D<DerivativeStructure> los) Transform a line-of-sight and its partial derivatives.
Vector3D	transformLOS(int i, Vector3D los) Transform a line-of-sight.

Methods inherited from class java.lang.Object

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

Constructor Detail

FixedRotation

public FixedRotation(ParameterType type,
             Vector3D axis,
             double angle)

Simple constructor.

The single parameter is the rotation angle.

Parameters:

type - parameter type

axis - rotation axis

angle - rotation angle

Method Detail

getNbEstimatedParameters

public int getNbEstimatedParameters()

Get the number of estimated parameters.

Specified by:

getNbEstimatedParameters in interface ParametricModel

Returns:

number of estimated parameters

getEstimatedParameters

public void getEstimatedParameters(double[] parameters,
                          int start,
                          int length)
                            throws RuggedException

Get the current values of the estimated parameters.

The single parameter is the rotation angle.

Specified by:

getEstimatedParameters in interface ParametricModel

Parameters:

parameters - global array where to put the parameters

start - start index of the array slice to consider

length - number of elements in the array slice to consider

Throws:

RuggedException - if the size of the slice does not match the number of estimated parameters

setEstimatedParameters

public void setEstimatedParameters(double[] parameters,
                          int start,
                          int length)
                            throws RuggedException

Set new values for the estimated parameters.

The single parameter is the rotation angle.

Specified by:

setEstimatedParameters in interface ParametricModel

Parameters:

parameters - global array containing the parameters to set (among others)

start - start index of the array slice to consider

length - number of elements in the array slice to consider

Throws:

RuggedException - if the size of the slice does not match the number of estimated parameters

transformLOS

public Vector3D transformLOS(int i,
                    Vector3D los)

Transform a line-of-sight.

Specified by:

transformLOS in interface TimeIndependentLOSTransform

Parameters:

i - los pixel index

los - line-of-sight to transform

Returns:

transformed line-of-sight

transformLOS

public FieldVector3D<DerivativeStructure> transformLOS(int i,
                                              FieldVector3D<DerivativeStructure> los)

Transform a line-of-sight and its partial derivatives.

This method is used for LOS calibration purposes. It allows to compute the Jacobian matrix of the LOS with respect to the parameters, which are typically polynomials coefficients representing rotation angles. These polynomials can be used for example to model thermo-elastic effects.

Note that in order for the partial derivatives to be properly set up, the setEstimatedParameters must have been called at least once before this method and its start parameter will be used to ensure the partial derivatives are ordered in the same way in the returned vector as they were in the set parameters.

Specified by:

transformLOS in interface TimeIndependentLOSTransform

Parameters:

i - los pixel index

los - line-of-sight to transform

Returns:

line of sight, and its first partial derivatives with respect to the parameters