Package org.orekit.models.earth.troposphere

Class AskneNordiusModel

java.lang.Object

org.orekit.models.earth.troposphere.AskneNordiusModel

All Implemented Interfaces:

TroposphericModel, ParameterDriversProvider

public class AskneNordiusModel
extends Object
implements TroposphericModel

The Askne Nordius model.

The hydrostatic part is equivalent to Saastamoinen, whereas the wet part takes into account mean temperature weighted with water vapor pressure and water vapor decrease factor.

Since:

12.1

Author:

Luc Maisonobe

See Also:

• "J. Askne and H. Nordius, Estimation of tropospheric delay for microwaves from surface weather data, Radio Science, volume 22, number 3, pages 379-386, May-June 1987"
• "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"

Field Summary

Fields

Modifier and Type	Field	Description
static final double	LOW_ELEVATION_THRESHOLD	Lowest acceptable elevation angle [rad].

Constructor Summary

Constructors

Constructor	Description
AskneNordiusModel(TroposphereMappingFunction mappingFunction, PressureTemperatureHumidityProvider pthProvider)	Create a new Askne Nordius model.

Method Summary

Modifier and Type	Method	Description
List<ParameterDriver>	getParametersDrivers()	Get the drivers for parameters.
<T extends CalculusFieldElement<T>> FieldTroposphericDelay<T>	pathDelay(FieldTrackingCoordinates<T> trackingCoordinates, FieldGeodeticPoint<T> point, T[] parameters, FieldAbsoluteDate<T> date)	Calculates the tropospheric path delay for the signal path from a ground station to a satellite.
TroposphericDelay	pathDelay(TrackingCoordinates trackingCoordinates, GeodeticPoint point, double[] parameters, AbsoluteDate 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

Field Details

LOW_ELEVATION_THRESHOLD

public static final double LOW_ELEVATION_THRESHOLD

Lowest acceptable elevation angle [rad].

See Also:

• Constant Field Values

Constructor Details

AskneNordiusModel

public AskneNordiusModel(TroposphereMappingFunction mappingFunction,
 PressureTemperatureHumidityProvider pthProvider)

Create a new Askne Nordius model.

Parameters:

mappingFunction - mapping function

pthProvider - provider for pressure, temperature and humidity

Method Details

pathDelay

public TroposphericDelay pathDelay(TrackingCoordinates trackingCoordinates,
 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 TroposphericModel

Parameters:

trackingCoordinates - tracking coordinates of the satellite

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

the path delay due to the troposphere

pathDelay

public <T extends CalculusFieldElement<T>>
FieldTroposphericDelay<T> pathDelay(FieldTrackingCoordinates<T> trackingCoordinates,
 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 TroposphericModel

Type Parameters:

T - type of the elements

Parameters:

trackingCoordinates - tracking coordinates of the satellite

point - station location

parameters - tropospheric model parameters at current date

date - current date

Returns:

the path delay due to the troposphere

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters