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Convert radiation pattern from phi-theta coordinates to azimuth-elevation coordinates

converts the antenna radiation pattern, `pat_azel`

= phitheta2azelpat(`pat_phitheta`

,`phi`

,`theta`

)`pat_phitheta`

, from phi
and theta coordinates to the pattern `pat_azel`

in azimuth and
elevation coordinates. `phi`

and `theta`

are
the phi and theta coordinates at which `pat_phitheta`

values are
defined. The `pat_azel`

matrix covers azimuth values from –180 to
180 degrees and elevation values from –90 to 90 degrees in one degree increments.
The function interpolates the `pat_phitheta`

matrix to estimate
the response of the antenna in a given direction.