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Beam shape loss for Gaussian antenna pattern

calculates the beam shape loss
`lb`

= beamloss`lb`

for a radar that scans over one angular dimension (1-D). The
`beamloss`

function assumes the antenna has a Gaussian pattern and
densely samples the angular domain. For the angular domain to be densely sampled, beam
dwells must be spaced by less than 0.71 of the one-way half-power beamwidth.

You can use `lb`

as an accurate approximation of loss for antenna
patterns other than Gaussian patterns.

[1] Barton, David Knox. "Beamshape
Loss for Different Patterns." In *Radar Equations for Modern Radar*,
148–149. Artech House Radar Series. Boston, Mass: Artech House, 2013.