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Range-dependent loss for rapidly scanning beam

calculates the range-dependent beam-dwell factor
`fbd`

= beamdwellfactor(`r`

,`hpbw`

,`scanrate`

)`fbd`

for an antenna at the specified range `r`

,
half-power beamwidth `hpbw`

, and scan rate `scanrate`

.
The `beamdwellfactor`

function assumes that the transmitter and receiver
antennas have equal beamwidth and an ideal Gaussian antenna pattern with no side
lobes.

[1] Barton, David Knox. "Beam-Dwell
Factor *F _{bd}*." In

[2] Barton, David Knox. "Antenna
Patterns." In *Radar Equations for Modern Radar*, 147. Artech House Radar
Series. Boston, Mass: Artech House, 2013.