org.orekit.propagation.analytical.tle.generation

Class FixedPointTleGenerationAlgorithm

java.lang.Object

org.orekit.propagation.analytical.tle.generation.FixedPointTleGenerationAlgorithm

All Implemented Interfaces:

TleGenerationAlgorithm

public class FixedPointTleGenerationAlgorithm
extends Object
implements TleGenerationAlgorithm

Fixed Point method to reverse SGP4 and SDP4 propagation algorithm and generate a usable TLE from a spacecraft state.

Using this algorithm, the B* value is not computed. In other words, the B* value from the template TLE is set to the generated one.

Since:

12.0

Author:

Thomas Paulet, Bryan Cazabonne

Field Summary

Fields

Modifier and Type	Field and Description
static double	EPSILON_DEFAULT Default value for epsilon.
static int	MAX_ITERATIONS_DEFAULT Default value for maxIterations.
static double	SCALE_DEFAULT Default value for scale.

Constructor Summary

Constructors

Constructor and Description
FixedPointTleGenerationAlgorithm() Default constructor.
FixedPointTleGenerationAlgorithm(double epsilon, int maxIterations, double scale) Constructor.
FixedPointTleGenerationAlgorithm(double epsilon, int maxIterations, double scale, TimeScale utc, Frame teme) Constructor.

Method Summary

Modifier and Type	Method and Description
<T extends org.hipparchus.CalculusFieldElement<T>> FieldTLE<T>	generate(FieldSpacecraftState<T> state, FieldTLE<T> templateTLE) Generate a TLE from a given spacecraft state and a template TLE.
TLE	generate(SpacecraftState state, TLE templateTLE) Generate a TLE from a given spacecraft state and a template TLE.

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON_DEFAULT

public static final double EPSILON_DEFAULT

Default value for epsilon.

See Also:

Constant Field Values

MAX_ITERATIONS_DEFAULT

public static final int MAX_ITERATIONS_DEFAULT

Default value for maxIterations.

See Also:

Constant Field Values

SCALE_DEFAULT

public static final double SCALE_DEFAULT

Default value for scale.

See Also:

Constant Field Values

Constructor Detail

FixedPointTleGenerationAlgorithm

@DefaultDataContext
public FixedPointTleGenerationAlgorithm()

Default constructor.

Uses the default data context as well as EPSILON_DEFAULT, MAX_ITERATIONS_DEFAULT, SCALE_DEFAULT for method convergence.

FixedPointTleGenerationAlgorithm

@DefaultDataContext
public FixedPointTleGenerationAlgorithm(double epsilon,
                                                            int maxIterations,
                                                            double scale)

Constructor.

Uses the default data context.

Parameters:

epsilon - used to compute threshold for convergence check

maxIterations - maximum number of iterations for convergence

scale - scale factor of the Fixed Point algorithm

FixedPointTleGenerationAlgorithm

public FixedPointTleGenerationAlgorithm(double epsilon,
                                        int maxIterations,
                                        double scale,
                                        TimeScale utc,
                                        Frame teme)

Constructor.

Parameters:

epsilon - used to compute threshold for convergence check

maxIterations - maximum number of iterations for convergence

scale - scale factor of the Fixed Point algorithm

utc - UTC time scale

teme - TEME frame

Method Detail

generate

public TLE generate(SpacecraftState state,
                    TLE templateTLE)

Generate a TLE from a given spacecraft state and a template TLE.

The template TLE is only used to get identifiers like satellite number, launch year, etc. In other words, the keplerian elements contained in the generate TLE a based on the provided state and not the template TLE.

Specified by:

generate in interface TleGenerationAlgorithm

Parameters:

state - spacecraft state

templateTLE - template TLE

Returns:

a TLE corresponding to the given state

generate

public <T extends org.hipparchus.CalculusFieldElement<T>> FieldTLE<T> generate(FieldSpacecraftState<T> state,
                                                                               FieldTLE<T> templateTLE)

Generate a TLE from a given spacecraft state and a template TLE.

The template TLE is only used to get identifiers like satellite number, launch year, etc. In other words, the keplerian elements contained in the generate TLE a based on the provided state and not the template TLE.

Specified by:

generate in interface TleGenerationAlgorithm

Type Parameters:

T - type of the elements

Parameters:

state - spacecraft state

templateTLE - template TLE

Returns:

a TLE corresponding to the given state