adf antenna files format polar or azimuth elevation

#ADF ANTENNA FILES FORMAT POLAR OR AZIMUTH ELEVATION FULL#

Parabolic - an azimuth cut that is based on a parabolic dish antenna pattern is generated by STK.

Sinc - an azimuth profile cut based on a Sinc pattern is generated by STK.

The data follows the elevation cut as described below after the NumberOfAzimuthData keyword.

UserAzimuthCutData - user supplies the azimuth profile cut data.

If this keyword is omitted, STK substitutes an analytical azimuth profile cut. The following keywords define the data profile for a particular numbered beam.ĪzimuthCutType Ĭonfirms that an azimuth profile cut data is available for this beam and is provided with the elevation profile cut data. However, it is a good practice to stack beams from the low elevation to high elevation.īeam number. Signifies that the antenna beam(s) profile data follows. Number of elevation beams provided in the data file. These values are applied to the back hemisphere of the antenna pattern (i.e., azimuth or elevation values are more than 90 degrees). Provides the gain values to be used while STK is computing beyond +- 90 degrees in elevation and azimuth.īacklobe gain values are substituted in case the elevation and/or azimuth cut data does not extend to ± 180 degrees. The antenna’s main-lobe 3dB beam-width in degrees or radians as specified by the AngleUnits keyword. The size of the antenna diameter or the broadside size of a rectangular dish specified in meters.

You can specify that no data values to be used, as described below for the beam level keyword NoGainDataValue. No extrapolation is attempted outside the data limits. STK uses 1D linear interpolation to interpolate the data in between the gain samples. By default, gain values are interpolated in dB scale. Gain values may be interpolated in linear scale. By default, the gain values are expected in dBs. The “beam” gain values may be specified in linear scale. After this keyword, all angle data is expected in degrees or radians, and changed to radians for internal use.

This keyword is required and must be the first line in the file.ĭegrees or Radians. Indicates the data format and version of the data format. For non-overlapping beams, the max beam elevation angle should be slightly less (on the order of 1.0e-6 deg) than the low angle of the next higher beam.Īntenna keywords apply to all the beams in the file.īeam keywords apply to individual beams. In areas where beam patterns overlap, gain is additive. The Elevation Azimuth Cuts data file format supports multi-beam data input. Please note that elevation cuts are required while the azimuth cuts are desired and may be substituted internally by STK. It is required that both elevation and azimuth profile data be measured at the beam’s maximum gain point. In the case where only an elevation profile cut is available, STK will substitute an analytical gain profile in the azimuth direction.

#ADF ANTENNA FILES FORMAT POLAR OR AZIMUTH ELEVATION FULL#

When the data is available for a full circle cut (e.g., 0 to 360 degrees, or -180 degrees to +180 degrees) you must provide both end points (i.e., 0 and 360 points, or -180 and +180 points) for proper interpolation of the data. For example, the azimuth is -90 degrees to +90 degrees and/or the elevation is -10 degrees to +40 degrees. If the elevation or the azimuth data is restricted to the front hemisphere of the gain pattern, it is required that the gain cut data be specified from -x1 to +x2 degrees across the boresight. It does not have to be the maximum gain value of the gain pattern. Point (Elevation =0, Azimuth = 0) in the data file is taken as the antenna's mechanical boresight value. STK will attempt to create a 3D pattern by combining the profiles and interpolating the data.Īzimuth is measured off the antenna boresight (z-axis) in the y,z-plane, and elevation is measured off the antenna boresight in the z,x-plane. The Elevation Azimuth Cuts Antenna file contains an elevation profile cut and, optionally, an azimuth profile cut, from a gain pattern. External Antenna Models Elevation Azimuth Cuts Antenna File

Adf antenna files format polar or azimuth elevation