Package org.orekit.models.earth.ionosphere

Class SsrVtecIonosphericModel

java.lang.Object

org.orekit.models.earth.ionosphere.SsrVtecIonosphericModel

All Implemented Interfaces:

IonosphericModel, ParameterDriversProvider

public class SsrVtecIonosphericModel
extends Object
implements IonosphericModel

Ionospheric model based on SSR IM201 message.

Within this message, the ionospheric VTEC is provided using spherical harmonic expansions. For a given ionospheric layer, the slant TEC value is calculated using the satellite elevation and the height of the corresponding layer. The total slant TEC is computed by the sum of the individual slant TEC for each layer.

Since:

11.0

Author:

Bryan Cazabonne

See Also:

"IGS State Space Representation (SSR) Format, Version 1.00, October 2020."

Constructor Summary

Constructors

Constructor	Description
SsrVtecIonosphericModel(SsrIm201 vtecMessage)	Constructor.

Method Summary

Modifier and Type	Method	Description
List<ParameterDriver>	getParametersDrivers()	Get the drivers for parameters.
<T extends CalculusFieldElement<T>> T	pathDelay(FieldSpacecraftState<T> state, TopocentricFrame baseFrame, double frequency, T[] parameters)	Calculates the ionospheric path delay for the signal path from a ground station to a satellite.
double	pathDelay(SpacecraftState state, TopocentricFrame baseFrame, double frequency, double[] parameters)	Calculates the ionospheric path delay for the signal path from a ground station to a satellite.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

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

Constructor Detail

SsrVtecIonosphericModel

public SsrVtecIonosphericModel(SsrIm201 vtecMessage)

Constructor.

Parameters:

vtecMessage - SSR Ionosphere VTEC Spherical Harmonics Message.

Method Detail

pathDelay

public double pathDelay(SpacecraftState state,
                        TopocentricFrame baseFrame,
                        double frequency,
                        double[] parameters)

Calculates the ionospheric path delay for the signal path from a ground station to a satellite.

This method is intended to be used for orbit determination issues. In that respect, if the elevation is below 0° the path delay will be equal to zero.

For individual use of the ionospheric model (i.e. not for orbit determination), another method signature can be implemented to compute the path delay for any elevation angle.

Specified by:

pathDelay in interface IonosphericModel

Parameters:

state - spacecraft state

baseFrame - base frame associated with the station

frequency - frequency of the signal in Hz

parameters - ionospheric model parameters at state date

Returns:

the path delay due to the ionosphere in m

pathDelay

public <T extends CalculusFieldElement<T>> T pathDelay(FieldSpacecraftState<T> state,
                                                       TopocentricFrame baseFrame,
                                                       double frequency,
                                                       T[] parameters)

Calculates the ionospheric path delay for the signal path from a ground station to a satellite.

This method is intended to be used for orbit determination issues. In that respect, if the elevation is below 0° the path delay will be equal to zero.

For individual use of the ionospheric model (i.e. not for orbit determination), another method signature can be implemented to compute the path delay for any elevation angle.

Specified by:

pathDelay in interface IonosphericModel

Type Parameters:

T - type of the elements

Parameters:

state - spacecraft state

baseFrame - base frame associated with the station

frequency - frequency of the signal in Hz

parameters - ionospheric model parameters at state date

Returns:

the path delay due to the ionosphere in m

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters