GTD 6.2.9

6.1. Simulation

When the user selects this option, the following panel is shown:


Simulation parameters panel

Simulation parameters panel

 

In this panel, the user can set the main parameters of the simulation:

  • Simulation Type. There are three types of simulations:
    • A far field simulation calculates the Far Field in the directions specified in the Output → Observation Directions option.
    • A near field simulation calculates the Near Field of a set of points specified by the user, in the Output → Observation Points option.
    • A coupling simulation calculates the coupling between two antennas. The user will have to introduce one or more active antennas and one passive antenna.
    • A MIMO simulation calculates the same parameters as the coupling simulation, as well as the MIMO channel transfer matrix, the channel correlation and overall system capacity.
    • A Doppler simulation calculates the Doppler shift. The user will have to introduce the Doppler parameters.
  • Frequency Sweep. To set the simulation frequency. The following parameters may be modified:
    • Enable Sweep: select this option to simulate a range of frequencies.
    • Units: to set the magnitude of the frequency. Hz, KHz, MHz and GHz are available.
    • Initial frequency: the first step in the frequency range, in the selected Units. If the frequency Sweep is disabled, this value coincides with the simulation frequency.
    • Final frequency: the last step in the frequency range, in the selected Units. This parameter may be only modified when the frequency Sweep is enabled.
    • Samples: number of frequency samples to be analyzed on the frequency SweepThis parameter may be only modified when the frequency Sweep is enabled.
  • Additional Effects. It is also possible to specify additional effects.
    • Number of bounces: It is possible to define the number of interactions (bounces) to be taken into account in the simulation for each observation point.
    • Diffracted: if this option is selected, the simulation will be performed taken into account diffraction.
    • Creeping: it this option is selected, the simulation will be performed taken into account creeping waves.
    • Transmission: if this option is selected, the simulation will be performed taken into account transmission.
    • Output Ray-Tracing: if this option is selected, the .ray file will be generated in the simulation and the View Ray option in Show Results menu will be available.
    • Selecting Advanced Parameters button, the following dialog will appear:

 

Advanced parameters dialog

 

In this dialog the user can modify several advanced parameters of the simulation, most of them relative to the analysis of the creeping waves:

  • Max. contributions: maximum number of contributions to taken into account. A contribution is for instance that due to a given double ray-path.
  • Max. iterations: maximum number of contributions that are taken into account.
  • Max. candidates: maximum number of surfaces that can shadow other surfaces.
  • Max. Silhoutte Points: maximum number of points for the silhoutte when creeping wave paths are computed.
  • Max. Geodesic Points: maximum number of geodesic points when computed a creeping wave path.
  • Max Antenna facets: maximum number of facets to be stored in the anxel of Z-Buffer matrix of the antenna.
  • Max. Surface facets: maximum number of facets to be stored in the anxel of Z-Buffer matrix of every surface.
  • Max Creeping Distance: maximum distance between a surface and the antenna to increase the creeping sample resolution.
  • Creeping Square Size: size edge of the square where the creeping sample resolution is increased near the antenna.
  • Creeping Higher Resolution: higher sampling resolution per surface used to compute the creeping silhoutte.
  • Creeping Lower Resolution: lower sampling resolution per surface used to compute the creeping silhoutte.

After setting up the simulation parameters, press the Save button to save the configuration.

 

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