Package org.orekit.models.earth.ionosphere

Class SsrVtecIonosphericModel

java.lang.Object
org.orekit.models.earth.ionosphere.AbstractIonosphericModel
org.orekit.models.earth.ionosphere.SsrVtecIonosphericModel
All Implemented Interfaces:
IonosphericModel, ParameterDriversProvider
public class SsrVtecIonosphericModel extends AbstractIonosphericModel
Ionospheric model based on SSR IM201 message.

Within this message, the ionospheric VTEC is provided using spherical harmonic expansions. For a given ionospheric layer, the slant TEC value is calculated using the satellite elevation and the height of the corresponding layer. The total slant TEC is computed by the sum of the individual slant TEC for each layer.

Since:
11.0
Author:
Bryan Cazabonne
See Also:
  • "IGS State Space Representation (SSR) Format, Version 1.00, October 2020."

  • Constructor Details

    • SsrVtecIonosphericModel

      public SsrVtecIonosphericModel(OneAxisEllipsoid earth, SsrIm201 vtecMessage)
      Constructor.
      Parameters:
      earth - earth body shape
      vtecMessage - SSR Ionosphere VTEC Spherical Harmonics Message.
      Since:
      14.0

  • Method Details

    • pathDelay

      public double pathDelay(Vector3D localP1, Vector3D localP2, TopocentricFrame baseFrame, AbsoluteDate receptionDate, double frequency, double[] parameters)
      Calculates the ionospheric path delay for the signal path from a ground station to an observing object (ground station or satellite).

      This method is intended to be used for orbit determination issues. In that respect, if the elevation is below 0° the path delay will be equal to zero.

      For individual use of the ionospheric model (i.e. not for orbit determination), another method signature can be implemented to compute the path delay for any elevation angle.

      Parameters:
      localP1 - position of path start point in baseFrame
      localP2 - position of path end point in baseFrame
      baseFrame - topocentric frame of point with lowest altitude between p1 and p2
      receptionDate - date at signal reception
      frequency - frequency of the signal in Hz
      parameters - ionospheric model parameters at state date
      Returns:
      the path delay due to the ionosphere in m

    • pathDelay

      public <T extends CalculusFieldElement<T>> T pathDelay(FieldVector3D<T> localP1, FieldVector3D<T> localP2, TopocentricFrame baseFrame, FieldAbsoluteDate<T> receptionDate, double frequency, T[] parameters)
      Calculates the ionospheric path delay for the signal path from a ground station to an observing object (ground station or satellite).

      This method is intended to be used for orbit determination issues. In that respect, if the elevation is below 0° the path delay will be equal to zero.

      For individual use of the ionospheric model (i.e. not for orbit determination), another method signature can be implemented to compute the path delay for any elevation angle.

      Type Parameters:
      T - type of the elements
      Parameters:
      localP1 - position of path start point in baseFrame
      localP2 - position of path end point in baseFrame
      baseFrame - topocentric frame of point with lowest altitude between p1 and p2
      receptionDate - date at signal reception
      frequency - frequency of the signal in Hz
      parameters - ionospheric model parameters at state date
      Returns:
      the path delay due to the ionosphere in m

    • getParametersDrivers

      public List<ParameterDriver> getParametersDrivers()
      Get the drivers for parameters.
      Returns:
      drivers for parameters