Package org.orekit.propagation.analytical.tle

Class FieldSGP4<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.FieldSGP4<T>

Type Parameters:

T - type of the field elements

All Implemented Interfaces:

FieldPropagator<T>, FieldPVCoordinatesProvider<T>, ParameterDriversProvider

public class FieldSGP4<T extends CalculusFieldElement<T>>
extends FieldTLEPropagator<T>

This class contains methods to compute propagated coordinates with the SGP4 model.

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 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
FieldSGP4(FieldTLE<T> initialTLE, AttitudeProvider attitudeProvider, T mass, Frame teme)	Constructor for a unique initial TLE.

Method Summary

Modifier and Type	Method	Description
protected void	sxpInitialize(T bStar)	Initialization proper to each propagator (SGP or SDP).
protected void	sxpPropagate(T tSince, T bStar)	Propagation proper to each propagator (SGP or SDP).

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

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

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, getBaseInitialState, 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, getParameterDriverWithSubstring, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported

Constructor Details

FieldSGP4

public FieldSGP4(FieldTLE<T> initialTLE,
 AttitudeProvider attitudeProvider,
 T mass,
 Frame teme)

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.

Since:

14.0

Method Details

sxpInitialize

protected void sxpInitialize(T bStar)

Initialization proper to each propagator (SGP or SDP).

Specified by:

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

Parameters:

bStar - value of the ballistic coefficient to use for propagation

sxpPropagate

protected void sxpPropagate(T tSince,
 T bStar)

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 (min)

bStar - value of the ballistic coefficient to use for propagation