Package org.orekit.models.earth.troposphere

Class ViennaThreeModel

java.lang.Object

org.orekit.models.earth.troposphere.ViennaThreeModel

All Implemented Interfaces:

DiscreteTroposphericModel, MappingFunction, ParameterDriversProvider

public class ViennaThreeModel
extends Object
implements DiscreteTroposphericModel, MappingFunction

The Vienna3 tropospheric delay model for radio techniques. The Vienna model data are given with a time interval of 6 hours.

The empirical coefficients b_h, b_w, c_h and c_w are computed with spherical harmonics. In that respect, they are considerably more advanced than those of VMF1 model.

Author:

Bryan Cazabonne

See Also:

"Landskron, D. & Böhm, J. J Geod (2018) VMF3/GPT3: refined discrete and empirical troposphere mapping functions 92: 349. https://doi.org/10.1007/s00190-017-1066-2", "Landskron D (2017) Modeling tropospheric delays for space geodetic techniques. Dissertation, Department of Geodesy and Geoinformation, TU Wien, Supervisor: J. Böhm. http://repositum.tuwien.ac.at/urn:nbn:at:at-ubtuw:1-100249"

Constructor Summary

Constructors

Constructor	Description
ViennaThreeModel(double[] coefficientA, double[] zenithDelay)	Build a new instance.
ViennaThreeModel(double[] coefficientA, double[] zenithDelay, TimeScale utc)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
<T extends CalculusFieldElement<T>> T[]	computeZenithDelay(FieldGeodeticPoint<T> point, T[] parameters, FieldAbsoluteDate<T> date)	This method allows the computation of the zenith hydrostatic and zenith wet delay.
double[]	computeZenithDelay(GeodeticPoint point, double[] parameters, AbsoluteDate date)	This method allows the computation of the zenith hydrostatic and zenith wet delay.
List<ParameterDriver>	getParametersDrivers()	Get the drivers for parameters.
double[]	mappingFactors(double elevation, GeodeticPoint point, AbsoluteDate date)	This method allows the computation of the hydrostatic and wet mapping functions.
<T extends CalculusFieldElement<T>> T[]	mappingFactors(T elevation, FieldGeodeticPoint<T> point, FieldAbsoluteDate<T> date)	This method allows the computation of the hydrostatic and wet mapping functions.
double	pathDelay(double elevation, GeodeticPoint point, double[] parameters, AbsoluteDate date)	Calculates the tropospheric path delay for the signal path from a ground station to a satellite.
<T extends CalculusFieldElement<T>> T	pathDelay(T elevation, FieldGeodeticPoint<T> point, T[] parameters, FieldAbsoluteDate<T> date)	Calculates the tropospheric 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

ViennaThreeModel

@DefaultDataContext
public ViennaThreeModel(double[] coefficientA,
                        double[] zenithDelay)

Build a new instance.

This constructor uses the default data context.

Parameters:

coefficientA - The a coefficients for the computation of the wet and hydrostatic mapping functions.

zenithDelay - Values of hydrostatic and wet delays

See Also:

ViennaThreeModel(double[], double[], TimeScale)

ViennaThreeModel

public ViennaThreeModel(double[] coefficientA,
                        double[] zenithDelay,
                        TimeScale utc)

Build a new instance.

Parameters:

coefficientA - The a coefficients for the computation of the wet and hydrostatic mapping functions.

zenithDelay - Values of hydrostatic and wet delays

utc - UTC time scale.

Since:

10.1

Method Detail

mappingFactors

public double[] mappingFactors(double elevation,
                               GeodeticPoint point,
                               AbsoluteDate date)

This method allows the computation of the hydrostatic and wet mapping functions. The resulting element is an array having the following form:

• double[0] = m_h(e) → hydrostatic mapping function
• double[1] = m_w(e) → wet mapping function

Specified by:

mappingFactors in interface MappingFunction

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

date - current date

Returns:

a two components array containing the hydrostatic and wet mapping functions.

mappingFactors

public <T extends CalculusFieldElement<T>> T[] mappingFactors(T elevation,
                                                              FieldGeodeticPoint<T> point,
                                                              FieldAbsoluteDate<T> date)

This method allows the computation of the hydrostatic and wet mapping functions. The resulting element is an array having the following form:

• T[0] = m_h(e) → hydrostatic mapping function
• T[1] = m_w(e) → wet mapping function

Specified by:

mappingFactors in interface MappingFunction

Type Parameters:

T - type of the elements

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

date - current date

Returns:

a two components array containing the hydrostatic and wet mapping functions.

pathDelay

public double pathDelay(double elevation,
                        GeodeticPoint point,
                        double[] parameters,
                        AbsoluteDate date)

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

Specified by:

pathDelay in interface DiscreteTroposphericModel

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

the path delay due to the troposphere in m

pathDelay

public <T extends CalculusFieldElement<T>> T pathDelay(T elevation,
                                                       FieldGeodeticPoint<T> point,
                                                       T[] parameters,
                                                       FieldAbsoluteDate<T> date)

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

Specified by:

pathDelay in interface DiscreteTroposphericModel

Type Parameters:

T - type of the elements

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

parameters - tropospheric model parameters at current date

date - current date

Returns:

the path delay due to the troposphere in m

computeZenithDelay

public double[] computeZenithDelay(GeodeticPoint point,
                                   double[] parameters,
                                   AbsoluteDate date)

This method allows the computation of the zenith hydrostatic and zenith wet delay. The resulting element is an array having the following form:

• T[0] = D_hz → zenith hydrostatic delay
• T[1] = D_wz → zenith wet delay

Parameters:

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

a two components array containing the zenith hydrostatic and wet delays.

computeZenithDelay

public <T extends CalculusFieldElement<T>> T[] computeZenithDelay(FieldGeodeticPoint<T> point,
                                                                  T[] parameters,
                                                                  FieldAbsoluteDate<T> date)

This method allows the computation of the zenith hydrostatic and zenith wet delay. The resulting element is an array having the following form:

• T[0] = D_hz → zenith hydrostatic delay
• T[1] = D_wz → zenith wet delay

Type Parameters:

T - type of the elements

Parameters:

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

a two components array containing the zenith hydrostatic and wet delays.

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters