Package org.orekit.models.earth.troposphere

Class ModifiedHopfieldModel

java.lang.Object

org.orekit.models.earth.troposphere.ModifiedHopfieldModel

All Implemented Interfaces:

TroposphericModel, ParameterDriversProvider

public class ModifiedHopfieldModel
extends Object
implements TroposphericModel

The modified Hopfield model.

This model from Hopfield 1969, 1970, 1972 is described in equations 5.105, 5.106, 5.107 and 5.108 in Guochang Xu, GPS - Theory, Algorithms and Applications, Springer, 2007.

Since:

12.1

Author:

Luc Maisonobe

See Also:

"Guochang Xu, GPS - Theory, Algorithms and Applications, Springer, 2007"

Constructor Summary

Constructors

Constructor	Description
ModifiedHopfieldModel()	Create a new Hopfield 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, FieldPressureTemperatureHumidity<T> weather, 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, PressureTemperatureHumidity weather, 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

Constructor Detail

ModifiedHopfieldModel

public ModifiedHopfieldModel()

Create a new Hopfield model.

Method Detail

pathDelay

public TroposphericDelay pathDelay(TrackingCoordinates trackingCoordinates,
                                   GeodeticPoint point,
                                   PressureTemperatureHumidity weather,
                                   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

weather - weather parameters for constant default values)

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,
                                                                               FieldPressureTemperatureHumidity<T> weather,
                                                                               T[] parameters,
                                                                               FieldAbsoluteDate<T> date)

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

The Saastamoinen model is not defined for altitudes below 0.0. for continuity reasons, we use the value for h = 0 when altitude is negative.

There are also numerical issues for elevation angles close to zero. For continuity reasons, elevations lower than a threshold will use the value obtained for the threshold itself.

Specified by:

pathDelay in interface TroposphericModel

Type Parameters:

T - type of the elements

Parameters:

trackingCoordinates - tracking coordinates of the satellite

point - station location

weather - weather parameters for constant default values)

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