Package org.orekit.models.earth.ionosphere

Class NeQuickModel

java.lang.Object

org.orekit.models.earth.ionosphere.NeQuickModel

All Implemented Interfaces:

IonosphericModel, ParameterDriversProvider

public class NeQuickModel
extends Object
implements IonosphericModel

NeQuick ionospheric delay model.

Since:

10.1

Author:

Bryan Cazabonne

See Also:

"European Union (2016). European GNSS (Galileo) Open Service-Ionospheric Correction Algorithm for Galileo Single Frequency Users. 1.2."

Constructor Summary

Constructors

Constructor	Description
NeQuickModel(double[] alpha)	Build a new instance.
NeQuickModel(double[] alpha, TimeScale utc)	Build a new instance.

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.
double	stec(AbsoluteDate date, GeodeticPoint recP, GeodeticPoint satP)	This method allows the computation of the Stant Total Electron Content (STEC).
<T extends CalculusFieldElement<T>> T	stec(FieldAbsoluteDate<T> date, FieldGeodeticPoint<T> recP, FieldGeodeticPoint<T> satP)	This method allows the computation of the Stant Total Electron Content (STEC).

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

NeQuickModel

@DefaultDataContext
public NeQuickModel(double[] alpha)

Build a new instance.

This constructor uses the default data context.

Parameters:

alpha - effective ionisation level coefficients

See Also:

NeQuickModel(double[], TimeScale)

NeQuickModel

public NeQuickModel(double[] alpha,
                    TimeScale utc)

Build a new instance.

Parameters:

alpha - effective ionisation level coefficients

utc - UTC time scale.

Since:

10.1

Method Detail

pathDelay

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

Description copied from interface: IonosphericModel

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)

Description copied from interface: IonosphericModel

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()

Description copied from interface: ParameterDriversProvider

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters

stec

public double stec(AbsoluteDate date,
                   GeodeticPoint recP,
                   GeodeticPoint satP)

This method allows the computation of the Stant Total Electron Content (STEC).

This method follows the Gauss algorithm exposed in section 2.5.8.2.8 of the reference document.

Parameters:

date - current date

recP - receiver position

satP - satellite position

Returns:

the STEC in TECUnits

stec

public <T extends CalculusFieldElement<T>> T stec(FieldAbsoluteDate<T> date,
                                                  FieldGeodeticPoint<T> recP,
                                                  FieldGeodeticPoint<T> satP)

This method allows the computation of the Stant Total Electron Content (STEC).

This method follows the Gauss algorithm exposed in section 2.5.8.2.8 of the reference document.

Type Parameters:

T - type of the elements

Parameters:

date - current date

recP - receiver position

satP - satellite position

Returns:

the STEC in TECUnits