wiki:Manual/Seamcat/ant_az_elev_setting

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How to set antenna height, pointing azimuth and elevation

The 'General' scenario tab sheets for all participating transmitters and receivers in both victim and interfering links have the 'Antenna pointing' selection fields, allowing user to set:

  • height of subject antenna,
  • antenna pointing azimuth, and
  • antenna pointing elevation.

    The height of antenna should correspond to its definition in the selected propagation model for that link (e.g. it might be the height above ground, effective height or height above local clutter).

    The antenna pointing azimuth effectively means antenna de-pointing, i.e. angle between the direction of main beam and the direction towards the calculated position of corresponding pair transceiver of the victim or interfering link. E.g. for Vr antenna the pointing azimuth value should describe the angle between direction of Vr's antenna main beam and the path to Wt. This parameter may be used either to add certain variable parameter to the final link budget due to random de-pointing of antennas (e.g. in mobile environment), or to show deliberate de-pointing of antenna (e.g. choosing a particular gain point on the antenna directivity pattern).

The antenna pointing elevation means the same de-pointing as the above described azimuth parameter, but applied in vertical plane. In real life this parameter would correspond to the impact of antenna down-tilt. The meaning of these parameters is illustrated in the figure below:

Note that the plane of the figure is horizontal for the azimuth angle and vertical for the elevation angle. It should be noted that these antenna pointing azimuth and elevation angles have impact only on the ultimate antenna gain applied in calculation of the link budget, but not on the mutual physical positioning of transceivers. The latter is impacted by the Path azimuth angle parameter.

Note that unless some intentional meaning of antenna de-pointing is foreseen in simulation scenario, it is recommended to always set the antenna pointing and elevation angle parameters to const=0, meaning that the main beam of the antenna is directed towards the corresponding pair transceiver in a link.

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