Package org.orekit.models.earth.troposphere

Class ViennaThree

java.lang.Object

org.orekit.models.earth.troposphere.AbstractVienna

org.orekit.models.earth.troposphere.ViennaThree

All Implemented Interfaces:

TroposphereMappingFunction, TroposphericModel, ParameterDriversProvider

public class ViennaThree
extends AbstractVienna

The Vienna 3 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
ViennaThree(ViennaAProvider aProvider, AzimuthalGradientProvider gProvider, TroposphericModel zenithDelayProvider, TimeScale utc)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
<T extends CalculusFieldElement<T>> T[]	mappingFactors(FieldTrackingCoordinates<T> trackingCoordinates, FieldGeodeticPoint<T> point, FieldAbsoluteDate<T> date)	This method allows the computation of the hydrostatic and wet mapping functions.
double[]	mappingFactors(TrackingCoordinates trackingCoordinates, GeodeticPoint point, AbsoluteDate date)	This method allows the computation of the hydrostatic and wet mapping functions.

Methods inherited from class org.orekit.models.earth.troposphere.AbstractVienna

getAProvider, getDayOfYear, getDayOfYear, getParametersDrivers, pathDelay, pathDelay

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 Details

ViennaThree

public ViennaThree(ViennaAProvider aProvider,
 AzimuthalGradientProvider gProvider,
 TroposphericModel zenithDelayProvider,
 TimeScale utc)

Build a new instance.

Parameters:

aProvider - provider for a_h and a_w coefficients

gProvider - provider for AzimuthalGradientCoefficients and FieldAzimuthalGradientCoefficients

zenithDelayProvider - provider for zenith delays

utc - UTC time scale

Method Details

mappingFactors

public double[] mappingFactors(TrackingCoordinates trackingCoordinates,
 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

Parameters:

trackingCoordinates - tracking coordinates of the satellite

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(FieldTrackingCoordinates<T> trackingCoordinates,
 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

Type Parameters:

T - type of the elements

Parameters:

trackingCoordinates - tracking coordinates of the satellite

point - station location

date - current date

Returns:

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