org.orekit.models.earth.troposphere

Class NiellMappingFunctionModel

java.lang.Object

org.orekit.models.earth.troposphere.NiellMappingFunctionModel

All Implemented Interfaces:

MappingFunction

public class NiellMappingFunctionModel
extends Object
implements MappingFunction

The Niell Mapping Function model for radio wavelengths. This model is an empirical mapping function. It only needs the values of the station latitude, height and the date for the computations.

With this model, the hydrostatic mapping function is time and latitude dependent whereas the wet mapping function is only latitude dependent.

Author:

Bryan Cazabonne

See Also:

"A. E. Niell(1996), Global mapping functions for the atmosphere delay of radio wavelengths, J. Geophys. Res., 101(B2), pp. 3227–3246, doi: 10.1029/95JB03048."

Constructor Summary

Constructors

Constructor and Description
NiellMappingFunctionModel() Builds a new instance.
NiellMappingFunctionModel(TimeScale utc) Builds a new instance.

Method Summary

Modifier and Type	Method and Description
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.

Methods inherited from class java.lang.Object

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

Constructor Detail

NiellMappingFunctionModel

@DefaultDataContext
public NiellMappingFunctionModel()

Builds a new instance.

This constructor uses the default data context.

See Also:

NiellMappingFunctionModel(TimeScale)

NiellMappingFunctionModel

public NiellMappingFunctionModel(TimeScale utc)

Builds a new instance.

Parameters:

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.