Package org.orekit.forces.maneuvers.jacobians

Class Duration

java.lang.Object

org.orekit.forces.maneuvers.jacobians.Duration

All Implemented Interfaces:

AdditionalStateProvider

public class Duration
extends Object
implements AdditionalStateProvider

Generator for one column of a Jacobian matrix for special case of maneuver duration.

Typical use cases for this are estimation of maneuver duration during either orbit determination or maneuver optimization.

Since:

11.1

Author:

Luc Maisonobe

See Also:

MedianDate, TriggerDate

Constructor Summary

Constructors

Constructor	Description
Duration(String startName, String stopName, String columnName)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
double[]	getAdditionalState(SpacecraftState state)	Get the additional state.
String	getName()	Get the name of the additional state.
boolean	yields(SpacecraftState state)	Check if this provider should yield so another provider has an opportunity to add missing parts.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.propagation.AdditionalStateProvider

init

Constructor Detail

Duration

public Duration(String startName,
                String stopName,
                String columnName)

Simple constructor.

Parameters:

startName - name of the parameter corresponding to the start date

stopName - name of the parameter corresponding to the stop date

columnName - name of the parameter corresponding to the column

Method Detail

getName

public String getName()

Get the name of the additional state.

Specified by:

getName in interface AdditionalStateProvider

Returns:

name of the additional state (names containing "orekit" with any case are reserved for the library internal use)

yields

public boolean yields(SpacecraftState state)

Check if this provider should yield so another provider has an opportunity to add missing parts.

Decision to yield is often based on an additional state being already available in the provided state (but it could theoretically also depend on an additional state derivative being already available, or any other criterion). If for example a provider needs the state transition matrix, it could implement this method as:

 public boolean yields(final SpacecraftState state) {
     return !state.getAdditionalStates().containsKey("STM");
 }
 

The default implementation returns false, meaning that state data can be generated immediately.

The column state can be computed only if the start and stop dates columns are available.

Specified by:

yields in interface AdditionalStateProvider

Parameters:

state - state to handle

Returns:

true if this provider should yield so another provider has an opportunity to add missing parts as the state is incrementally built up

getAdditionalState

public double[] getAdditionalState(SpacecraftState state)

Get the additional state.

Specified by:

getAdditionalState in interface AdditionalStateProvider

Parameters:

state - spacecraft state to which additional state should correspond

Returns:

additional state corresponding to spacecraft state