Returns the radius of the first Fresnel ellipsoid at a point on a path, in
millimeters.
This is Recommendation ITU-R P.526-16, equation (2). The radius is widest halfway
along the path, and the diffraction zone starts where the clearance falls to 60%
of it.
Parameters
nearM: number
The distance from one antenna to the point, in meters.
farM: number
The distance from the point to the other antenna, in meters.
Returns the radius of the first Fresnel ellipsoid at a point on a path, in millimeters.
This is Recommendation ITU-R P.526-16, equation (2). The radius is widest halfway along the path, and the diffraction zone starts where the clearance falls to 60% of it.