Package org.orekit.propagation.analytical.tle

Class FieldDeepSDP4<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.propagation.FieldAbstractPropagator<T>

org.orekit.propagation.analytical.FieldAbstractAnalyticalPropagator<T>

org.orekit.propagation.analytical.tle.FieldTLEPropagator<T>

org.orekit.propagation.analytical.tle.FieldDeepSDP4<T>

Type Parameters:

T - type of the field elements

All Implemented Interfaces:

FieldPropagator<T>, FieldPVCoordinatesProvider<T>, ParameterDriversProvider

public class FieldDeepSDP4<T extends CalculusFieldElement<T>>
extends FieldTLEPropagator<T>

This class contains the methods that compute deep space perturbation terms.

The user should not bother in this class since it is handled internaly by the TLEPropagator.

This implementation is largely inspired from the paper and source code Revisiting Spacetrack Report #3 and is fully compliant with its results and tests cases.

Since:

11.0

Author:

Felix R. Hoots, Ronald L. Roehrich, December 1980 (original fortran), David A. Vallado, Paul Crawford, Richard Hujsak, T.S. Kelso (C++ translation and improvements), Fabien Maussion (java translation), Thomas Paulet (field translation)

Field Summary

Fields

Modifier and Type	Field	Description
protected T	em	New eccentricity.
protected T	omgadf	New perigee argument.
protected T	xinc	New inclination.
protected T	xll	Parameter for xl computation.
protected T	xn	New mean motion.

Fields inherited from class org.orekit.propagation.analytical.tle.FieldTLEPropagator

a, a0dp, beta0, beta02, c1, c2, c4, coef, coef1, cosi0, e, e0sq, eeta, eta, etasq, i, omega, omgdot, perige, s4, sini0, t2cof, theta2, tle, tsi, utc, xl, xmdot, xn0dp, xnodcf, xnode, xnodot

Fields inherited from interface org.orekit.propagation.FieldPropagator

DEFAULT_MASS

Constructor Summary

Constructors

Constructor	Description
FieldDeepSDP4(FieldTLE<T> initialTLE, AttitudeProvider attitudeProvider, T mass, Frame teme, T[] parameters)	Constructor for a unique initial TLE.
FieldDeepSDP4(FieldTLE<T> initialTLE, AttitudeProvider attitudeProvider, T mass, T[] parameters)	Constructor for a unique initial TLE.

Method Summary

Modifier and Type	Method	Description
protected void	deepPeriodicEffects(T t)	Computes periodic terms from current coordinates and epoch.
protected void	deepSecularEffects(T t)	Computes secular terms from current coordinates and epoch.
protected void	luniSolarTermsComputation()	Computes luni - solar terms from initial coordinates and epoch.
protected void	sxpInitialize(T[] parameters)	Initialization proper to each propagator (SGP or SDP).
protected void	sxpPropagate(T tSince, T[] parameters)	Propagation proper to each propagator (SGP or SDP).
protected double	thetaG(FieldAbsoluteDate<T> date)	Computes SPACETRACK#3 compliant earth rotation angle.

Methods inherited from class org.orekit.propagation.analytical.tle.FieldTLEPropagator

getFrame, getMass, getMU, getParametersDrivers, getPVCoordinates, getTLE, propagateOrbit, resetInitialState, resetIntermediateState, selectExtrapolator, selectExtrapolator, selectExtrapolator, selectExtrapolator

Methods inherited from class org.orekit.propagation.analytical.FieldAbstractAnalyticalPropagator

acceptStep, addEventDetector, basicPropagate, clearEventsDetectors, getEphemerisGenerator, getEventDetectors, propagate

Methods inherited from class org.orekit.propagation.FieldAbstractPropagator

addAdditionalDataProvider, getAdditionalDataProviders, getAttitudeProvider, getField, getInitialState, getManagedAdditionalData, getMultiplexer, getStartDate, initializeAdditionalData, initializePropagation, isAdditionalDataManaged, propagate, removeAdditionalDataProvider, setAttitudeProvider, setStartDate, stateChanged, updateAdditionalData, updateUnmanagedData

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.FieldPropagator

clearStepHandlers, getPosition, getPVCoordinates, getVelocity, setStepHandler, setStepHandler

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported

Field Details

omgadf

protected T extends CalculusFieldElement<T> omgadf

New perigee argument.

xn

protected T extends CalculusFieldElement<T> xn

New mean motion.

xll

protected T extends CalculusFieldElement<T> xll

Parameter for xl computation.

em

protected T extends CalculusFieldElement<T> em

New eccentricity.

xinc

protected T extends CalculusFieldElement<T> xinc

New inclination.

Constructor Details

FieldDeepSDP4

@DefaultDataContext
public FieldDeepSDP4(FieldTLE<T> initialTLE,
 AttitudeProvider attitudeProvider,
 T mass,
 T[] parameters)

Constructor for a unique initial TLE.

This constructor uses the default data context.

Parameters:

initialTLE - the TLE to propagate.

attitudeProvider - provider for attitude computation

mass - spacecraft mass (kg)

parameters - SGP4 and SDP4 model parameters

See Also:

• FieldDeepSDP4(FieldTLE, AttitudeProvider, CalculusFieldElement, Frame, CalculusFieldElement[])

FieldDeepSDP4

public FieldDeepSDP4(FieldTLE<T> initialTLE,
 AttitudeProvider attitudeProvider,
 T mass,
 Frame teme,
 T[] parameters)

Constructor for a unique initial TLE.

Parameters:

initialTLE - the TLE to propagate.

attitudeProvider - provider for attitude computation

mass - spacecraft mass (kg)

teme - the TEME frame to use for propagation.

parameters - SGP4 and SDP4 model parameters

Method Details

luniSolarTermsComputation

protected void luniSolarTermsComputation()

Computes luni - solar terms from initial coordinates and epoch.

deepSecularEffects

protected void deepSecularEffects(T t)

Computes secular terms from current coordinates and epoch.

Parameters:

t - offset from initial epoch (minutes)

deepPeriodicEffects

protected void deepPeriodicEffects(T t)

Computes periodic terms from current coordinates and epoch.

Parameters:

t - offset from initial epoch (min)

sxpInitialize

protected void sxpInitialize(T[] parameters)

Initialization proper to each propagator (SGP or SDP).

Specified by:

sxpInitialize in class FieldTLEPropagator<T extends CalculusFieldElement<T>>

Parameters:

parameters - model parameters

sxpPropagate

protected void sxpPropagate(T tSince,
 T[] parameters)

Propagation proper to each propagator (SGP or SDP).

Specified by:

sxpPropagate in class FieldTLEPropagator<T extends CalculusFieldElement<T>>

Parameters:

tSince - the offset from initial epoch (minutes)

parameters - model parameters

thetaG

protected double thetaG(FieldAbsoluteDate<T> date)

Computes SPACETRACK#3 compliant earth rotation angle.

Parameters:

date - the current date

Returns:

the ERA (rad)