Package org.orekit.models.earth.troposphere

Class GlobalMappingFunctionModel

java.lang.Object

org.orekit.models.earth.troposphere.GlobalMappingFunctionModel

All Implemented Interfaces:

TroposphereMappingFunction

public class GlobalMappingFunctionModel
extends Object
implements TroposphereMappingFunction

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

The Global Mapping Function is based on spherical harmonics up to degree and order of 9. It was developed to be consistent with the Vienna1 mapping function model.

Author:

Bryan Cazabonne

See Also:

• "Boehm, J., A.E. Niell, P. Tregoning, H. Schuh (2006), Global Mapping Functions (GMF): A new empirical mapping function based on numerical weather model data, Geoph. Res. Letters, Vol. 33, L07304, doi:10.1029/2005GL025545."
• "Petit, G. and Luzum, B. (eds.), IERS Conventions (2010), IERS Technical Note No. 36, BKG (2010)"

Constructor Summary

Constructors

Constructor	Description
GlobalMappingFunctionModel()	Build a new instance.
GlobalMappingFunctionModel(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 java.lang.Object

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

Constructor Details

GlobalMappingFunctionModel

@DefaultDataContext
public GlobalMappingFunctionModel()

Build a new instance.

This constructor uses the default data context.

See Also:

• GlobalMappingFunctionModel(TimeScale)

GlobalMappingFunctionModel

public GlobalMappingFunctionModel(TimeScale utc)

Build a new instance.

Parameters:

utc - UTC time scale.

Since:

10.1

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

Specified by:

mappingFactors in interface TroposphereMappingFunction

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

Specified by:

mappingFactors in interface TroposphereMappingFunction

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.