A sample antenna noise temperature file is provided for your reference, where antenna noise (in Kelvin) is a function of the elevation angle (in degrees). The elevation angle is measured as the angle between the detic nadir vector of the antenna's parent object and the relative position vector minus 90 degrees. The data following the NumberOfPoints keyword consists of the elevation angle in degrees (first column) and the corresponding noise temperature in Kelvin (second column). The values must be in increasing order by elevation angle. STK interpolates the table as necessary to determine the corresponding noise temperature for a given elevation angle. If the elevation angle is less than the first point in the table, the noise temperature of the first point is used. If the elevation angle is greater than the last point in the table, the noise temperature of the last point in the table is used.
A sample antenna noise temperature file
NumberOfPoints 10
0.0 100.0
5.0 80.0
10.0 70.0
20.0 60.0
30.0 55.0
45.0 50.0
60.0 45.0
70.0 43.0
80.0 41.0
90.0 40.0
If the above sample appears small, bear in mind that the number of lines in a file of this type depends, in part, on its granularity. The above sample runs through a range of 0 to 90 degrees in elevation angle by increments of 5-15 degrees. Obviously, smaller increments over the same range would yield a larger file.
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