org.orekit.propagation.analytical

Class AbstractAnalyticalMatricesHarvester

java.lang.Object

org.orekit.propagation.AbstractMatricesHarvester

org.orekit.propagation.analytical.AbstractAnalyticalMatricesHarvester

All Implemented Interfaces:

MatricesHarvester

public abstract class AbstractAnalyticalMatricesHarvester
extends AbstractMatricesHarvester

Base class harvester between two-dimensional Jacobian matrices and analytical orbit propagator.

Since:

11.1

Author:

Thomas Paulet, Bryan Cazabonne

Field Summary

Fields inherited from class org.orekit.propagation.AbstractMatricesHarvester

STATE_DIMENSION

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractAnalyticalMatricesHarvester(AbstractAnalyticalPropagator propagator, String stmName, RealMatrix initialStm, DoubleArrayDictionary initialJacobianColumns) Simple constructor.

Method Summary

Modifier and Type	Method and Description
void	freezeColumnsNames() Freeze the names of the Jacobian columns.
abstract AbstractAnalyticalGradientConverter	getGradientConverter() Get the gradient converter related to the analytical orbit propagator.
List<String>	getJacobiansColumnsNames() Get the names of the parameters in the matrix returned by MatricesHarvester.getParametersJacobian(org.orekit.propagation.SpacecraftState).
RealMatrix	getParametersJacobian(SpacecraftState state) Get the Jacobian with respect to propagation parameters.
RealMatrix	getStateTransitionMatrix(SpacecraftState state) Extract state transition matrix from state.
void	setReferenceState(SpacecraftState reference) Set up reference state.

Methods inherited from class org.orekit.propagation.AbstractMatricesHarvester

getConversionJacobian, getInitialJacobianColumn, getInitialStateTransitionMatrix, getStmName

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractAnalyticalMatricesHarvester

protected AbstractAnalyticalMatricesHarvester(AbstractAnalyticalPropagator propagator,
                                              String stmName,
                                              RealMatrix initialStm,
                                              DoubleArrayDictionary initialJacobianColumns)

Simple constructor.

The arguments for initial matrices must be compatible with the orbit type and position angle that will be used by propagator

Parameters:

propagator - propagator bound to this harvester

stmName - State Transition Matrix state name

initialStm - initial State Transition Matrix ∂Y/∂Y₀, if null (which is the most frequent case), assumed to be 6x6 identity

initialJacobianColumns - initial columns of the Jacobians matrix with respect to parameters, if null or if some selected parameters are missing from the dictionary, the corresponding initial column is assumed to be 0

Method Detail

getJacobiansColumnsNames

public List<String> getJacobiansColumnsNames()

Get the names of the parameters in the matrix returned by MatricesHarvester.getParametersJacobian(org.orekit.propagation.SpacecraftState).

Beware that the names of the parameters are fully known only once all force models have been set up and their parameters properly selected. Applications that retrieve the matrices harvester first and select the force model parameters to retrieve afterwards (but obviously before starting propagation) must take care to wait until the parameters have been set up before they call this method. Calling the method too early would return wrong results.

The names are returned in the Jacobians matrix columns order

Returns:

names of the parameters (i.e. columns) of the Jacobian matrix

freezeColumnsNames

public void freezeColumnsNames()

Freeze the names of the Jacobian columns.

This method is called when propagation starts, i.e. when configuration is completed

Specified by:

freezeColumnsNames in class AbstractMatricesHarvester

getStateTransitionMatrix

public RealMatrix getStateTransitionMatrix(SpacecraftState state)

Extract state transition matrix from state.

Specified by:

getStateTransitionMatrix in interface MatricesHarvester

Overrides:

getStateTransitionMatrix in class AbstractMatricesHarvester

Parameters:

state - spacecraft state

Returns:

state transition matrix, with semantics consistent with propagation, or null if no state transition matrix is available orbit type.

getParametersJacobian

public RealMatrix getParametersJacobian(SpacecraftState state)

Get the Jacobian with respect to propagation parameters.

Specified by:

getParametersJacobian in interface MatricesHarvester

Overrides:

getParametersJacobian in class AbstractMatricesHarvester

Parameters:

state - spacecraft state

Returns:

Jacobian with respect to propagation parameters, or null if there are no parameters

setReferenceState

public void setReferenceState(SpacecraftState reference)

Set up reference state.

This method is called whenever the global propagation reference state changes. This corresponds to the start of propagation in batch least squares orbit determination or at prediction step for each measurement in Kalman filtering. Its goal is to allow the harvester to compute some internal data. Analytical models like TLE use it to compute analytical derivatives, semi-analytical models like DSST use it to compute short periodic terms, numerical models do not use it at all.

Specified by:

setReferenceState in interface MatricesHarvester

Overrides:

setReferenceState in class AbstractMatricesHarvester

Parameters:

reference - reference state to set

getGradientConverter

public abstract AbstractAnalyticalGradientConverter getGradientConverter()

Get the gradient converter related to the analytical orbit propagator.

Returns:

the gradient converter