org.orekit.orbits

Class FieldOrbitBlender<KK extends org.hipparchus.CalculusFieldElement<KK>>

java.lang.Object

org.orekit.time.AbstractFieldTimeInterpolator<FieldOrbit<KK>,KK>

org.orekit.orbits.AbstractFieldOrbitInterpolator<KK>

org.orekit.orbits.FieldOrbitBlender<KK>

Type Parameters:

KK - type of field element

All Implemented Interfaces:

FieldTimeInterpolator<FieldOrbit<KK>,KK>

public class FieldOrbitBlender<KK extends org.hipparchus.CalculusFieldElement<KK>>
extends AbstractFieldOrbitInterpolator<KK>

Orbit blender.

Its purpose is to interpolate orbit state between tabulated orbit states using the concept of blending, exposed in : "Efficient Covariance Interpolation using Blending of Approximate State Error Transitions" by Sergei Tanygin, and applying it to orbit states instead of covariances.

It propagates tabulated values to the interpolating time using given analytical propagator and then blend each propagated states using a smoothstep function. It gives especially good results as explained here compared to Hermite interpolation when time steps between tabulated values get significant (In LEO, > 10 mn for example).

Author:

Vincent Cucchietti

See Also:

SmoothStepFactory, SmoothStepFactory.FieldSmoothStepFunction

Nested Class Summary

Nested classes/interfaces inherited from class org.orekit.time.AbstractFieldTimeInterpolator

AbstractFieldTimeInterpolator.InterpolationData

Field Summary

Fields inherited from class org.orekit.time.AbstractFieldTimeInterpolator

DEFAULT_EXTRAPOLATION_THRESHOLD_SEC, DEFAULT_INTERPOLATION_POINTS

Constructor Summary

Constructors

Constructor and Description
FieldOrbitBlender(org.hipparchus.analysis.polynomials.SmoothStepFactory.FieldSmoothStepFunction<KK> blendingFunction, FieldAbstractAnalyticalPropagator<KK> analyticalPropagator, Frame outputInertialFrame) Default constructor.

Method Summary

Modifier and Type	Method and Description
FieldOrbit<KK>	interpolate(AbstractFieldTimeInterpolator.InterpolationData interpolationData) Interpolate instance from given interpolation data.

Methods inherited from class org.orekit.orbits.AbstractFieldOrbitInterpolator

getOutputInertialFrame, interpolate

Methods inherited from class org.orekit.time.AbstractFieldTimeInterpolator

addOptionalSubInterpolatorIfDefined, checkInterpolatorCompatibilityWithSampleSize, getCentralDate, getExtrapolationThreshold, getNbInterpolationPoints, getSubInterpolators, getTimeParameter, interpolate

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.time.FieldTimeInterpolator

interpolate, interpolate

Constructor Detail

FieldOrbitBlender

public FieldOrbitBlender(org.hipparchus.analysis.polynomials.SmoothStepFactory.FieldSmoothStepFunction<KK> blendingFunction,
                         FieldAbstractAnalyticalPropagator<KK> analyticalPropagator,
                         Frame outputInertialFrame)

Default constructor.

Parameters:

blendingFunction - smoothstep function used for blending

analyticalPropagator - analytical propagator used to propagate tabulated orbits to interpolating time

outputInertialFrame - output inertial frame

Throws:

OrekitException - if output frame is not inertial

Method Detail

interpolate

public FieldOrbit<KK> interpolate(AbstractFieldTimeInterpolator.InterpolationData interpolationData)

Interpolate instance from given interpolation data.

Specified by:

interpolate in class AbstractFieldTimeInterpolator<FieldOrbit<KK extends org.hipparchus.CalculusFieldElement<KK>>,KK extends org.hipparchus.CalculusFieldElement<KK>>

Parameters:

interpolationData - interpolation data

Returns:

interpolated instance from given interpolation data.