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

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 latitude, double lambda) Create a new Mendes-Pavlis model for the troposphere.

Method Summary

Modifier and Type	Method and Description
double[]	computeZenithDelay(double height, double[] parameters, AbsoluteDate date) This method allows the computation of the zenith hydrostatic and zenith wet delay.
<T extends RealFieldElement<T>> T[]	computeZenithDelay(T height, T[] parameters, FieldAbsoluteDate<T> 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 latitude, double lambda) Create a new Mendes-Pavlis model using a standard atmosphere model.
double[]	mappingFactors(double elevation, double height, double[] parameters, AbsoluteDate date) With the Mendes Pavlis tropospheric model, the mapping function is not split into hydrostatic and wet component.
<T extends RealFieldElement<T>> T[]	mappingFactors(T elevation, T height, T[] parameters, FieldAbsoluteDate<T> date) This method allows the computation of the hydrostatic and wet mapping functions.
double	pathDelay(double elevation, double height, double[] parameters, AbsoluteDate date) Calculates the tropospheric path delay for the signal path from a ground station to a satellite.
<T extends RealFieldElement<T>> T	pathDelay(T elevation, T height, 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.MappingFunction

getParameters, getParameters

Constructor Detail

MendesPavlisModel

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

latitude - geodetic latitude of the station, radians

lambda - laser wavelength, µm

Method Detail

getStandardModel

public static MendesPavlisModel getStandardModel(double latitude,
                                                 double lambda)

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

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

Parameters:

latitude - site latitude, radians

lambda - laser wavelength, µm

Returns:

a Mendes-Pavlis model with standard environmental values

pathDelay

public double pathDelay(double elevation,
                        double height,
                        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

height - the height of the station in m above sea level

parameters - tropospheric model parameters.

date - current date

Returns:

the path delay due to the troposphere in m

pathDelay

public <T extends RealFieldElement<T>> T pathDelay(T elevation,
                                                   T height,
                                                   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

height - the height of the station in m above sea level

parameters - tropospheric model parameters.

date - current date

Returns:

the path delay due to the troposphere in m

computeZenithDelay

public double[] computeZenithDelay(double height,
                                   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

Specified by:

computeZenithDelay in interface DiscreteTroposphericModel

Parameters:

height - the height of the station in m above sea level.

parameters - tropospheric model parameters.

date - current date

Returns:

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

computeZenithDelay

public <T extends RealFieldElement<T>> T[] computeZenithDelay(T height,
                                                              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

Specified by:

computeZenithDelay in interface DiscreteTroposphericModel

Type Parameters:

T - type of the elements

Parameters:

height - the height of the station in m above sea level.

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,
                               double height,
                               double[] parameters,
                               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.

height - the height of the station in m above sea level.

parameters - tropospheric model parameters.

date - current date

Returns:

a two components array containing the hydrostatic and wet mapping functions.

mappingFactors

public <T extends RealFieldElement<T>> T[] mappingFactors(T elevation,
                                                          T height,
                                                          T[] parameters,
                                                          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.

height - the height of the station in m above sea level.

parameters - tropospheric model parameters.

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 MappingFunction

Returns:

drivers for tropospheric model parameters