org.orekit.models.earth.troposphere

Class MendesPavlisModel

java.lang.Object

org.orekit.models.earth.troposphere.MendesPavlisModel

All Implemented Interfaces:

DiscreteTroposphericModel, MappingFunction

public class MendesPavlisModel
extends Object
implements DiscreteTroposphericModel, MappingFunction

The Mendes - Pavlis tropospheric delay model for optical techniques. It is valid for a wide range of wavelengths from 0.355µm to 1.064µm (Mendes and Pavlis, 2003)

Author:

Bryan Cazabonne

See Also:

"Mendes, V. B., & Pavlis, E. C. (2004). High‐accuracy zenith delay prediction at optical wavelengths. Geophysical Research Letters, 31(14).", "Petit, G. and Luzum, B. (eds.), IERS Conventions (2010), IERS Technical Note No. 36, BKG (2010)"

Constructor Summary

Constructors

Constructor and Description
MendesPavlisModel(double t0, double p0, double rh, double lambda) Create a new Mendes-Pavlis model for the troposphere.

Method Summary

Modifier and Type	Method and Description
<T extends CalculusFieldElement<T>> T[]	computeZenithDelay(FieldGeodeticPoint<T> point, T[] parameters, FieldAbsoluteDate<T> date) This method allows the computation of the zenith hydrostatic and zenith wet delay.
double[]	computeZenithDelay(GeodeticPoint point, double[] parameters, AbsoluteDate date) This method allows the computation of the zenith hydrostatic and zenith wet delay.
List<ParameterDriver>	getParametersDrivers() Get the drivers for tropospheric model parameters.
static MendesPavlisModel	getStandardModel(double lambda) Create a new Mendes-Pavlis model using a standard atmosphere model.
double[]	mappingFactors(double elevation, GeodeticPoint point, AbsoluteDate date) With the Mendes Pavlis tropospheric model, the mapping function is not split into hydrostatic and wet component.
<T extends CalculusFieldElement<T>> T[]	mappingFactors(T elevation, FieldGeodeticPoint<T> point, FieldAbsoluteDate<T> date) With the Mendes Pavlis tropospheric model, the mapping function is not split into hydrostatic and wet component.
double	pathDelay(double elevation, GeodeticPoint point, double[] parameters, AbsoluteDate date) Calculates the tropospheric path delay for the signal path from a ground station to a satellite.
<T extends CalculusFieldElement<T>> T	pathDelay(T elevation, FieldGeodeticPoint<T> point, T[] parameters, FieldAbsoluteDate<T> 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.models.earth.troposphere.DiscreteTroposphericModel

getParameters, getParameters

Constructor Detail

MendesPavlisModel

public MendesPavlisModel(double t0,
                         double p0,
                         double rh,
                         double lambda)

Create a new Mendes-Pavlis model for the troposphere. This initialisation will compute the water vapor pressure thanks to the values of the pressure, the temperature and the humidity

Parameters:

t0 - the temperature at the station, K

p0 - the atmospheric pressure at the station, hPa

rh - the humidity at the station, percent (50% → 0.5)

lambda - laser wavelength, µm

Method Detail

getStandardModel

public static MendesPavlisModel getStandardModel(double lambda)

Create a new Mendes-Pavlis model using a standard atmosphere model.

• temperature: 18 degree Celsius
• pressure: 1013.25 hPa
• humidity: 50%

Parameters:

lambda - laser wavelength, µm

Returns:

a Mendes-Pavlis model with standard environmental values

pathDelay

public double pathDelay(double elevation,
                        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 DiscreteTroposphericModel

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

the path delay due to the troposphere in m

pathDelay

public <T extends CalculusFieldElement<T>> T pathDelay(T elevation,
                                                       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 DiscreteTroposphericModel

Type Parameters:

T - type of the elements

Parameters:

elevation - the elevation of the satellite, in radians

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

the path delay due to the troposphere in m

computeZenithDelay

public double[] computeZenithDelay(GeodeticPoint point,
                                   double[] parameters,
                                   AbsoluteDate date)

This method allows the computation of the zenith hydrostatic and zenith wet delay. The resulting element is an array having the following form:

• double[0] = D_hz → zenith hydrostatic delay
• double[1] = D_wz → zenith wet delay

Parameters:

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

a two components array containing the zenith hydrostatic and wet delays.

computeZenithDelay

public <T extends CalculusFieldElement<T>> T[] computeZenithDelay(FieldGeodeticPoint<T> point,
                                                                  T[] parameters,
                                                                  FieldAbsoluteDate<T> date)

This method allows the computation of the zenith hydrostatic and zenith wet delay. The resulting element is an array having the following form:

• T[0] = D_hz → zenith hydrostatic delay
• T[1] = D_wz → zenith wet delay

Type Parameters:

T - type of the elements

Parameters:

point - station location

parameters - tropospheric model parameters

date - current date

Returns:

a two components array containing the zenith hydrostatic and wet delays.

mappingFactors

public double[] mappingFactors(double elevation,
                               GeodeticPoint point,
                               AbsoluteDate date)

With the Mendes Pavlis tropospheric model, the mapping function is not split into hydrostatic and wet component.

Therefore, the two components of the resulting array are equals.

• double[0] = m(e) → total mapping function
• double[1] = m(e) → total mapping function

The total delay will thus be computed as:
δ = D_hz * m(e) + D_wz * m(e)
δ = (D_hz + D_wz) * m(e) = δ_z * m(e)

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)

With the Mendes Pavlis tropospheric model, the mapping function is not split into hydrostatic and wet component.

Therefore, the two components of the resulting array are equals.

• double[0] = m(e) → total mapping function
• double[1] = m(e) → total mapping function

The total delay will thus be computed as:
δ = D_hz * m(e) + D_wz * m(e)
δ = (D_hz + D_wz) * m(e) = δ_z * m(e)

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.

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for tropospheric model parameters.

Specified by:

getParametersDrivers in interface DiscreteTroposphericModel

Returns:

drivers for tropospheric model parameters