beam_distance {bioRad}

Calculate radar beam distance

Description

Calculates the distance as measured over the earth's surface (the down range) for a given beam elevation and slant range.

Usage

beam_distance(range, elev, k = 4/3, lat = 35, re = 6378, rp = 6357)

Arguments

range

Numeric. Slant range, i.e. the length of the skywave path between target and the radar antenna, in m.

elev

Numeric. Beam elevation, in degrees.

k

Numeric. Standard refraction coefficient.

lat

Numeric. Geodetic latitude of the radar, in degrees.

re

Numeric. Earth equatorial radius, in km.

rp

Numeric. Earth polar radius, in km.

Details

depends on beam_height to calculate beam height.

Value

Beam distance (down range), in m.

See Also

• beam_height()

Other beam_functions: beam_height(), beam_profile(), beam_profile_overlap(), beam_range(), beam_width(), gaussian_beam_profile()

Examples

# Down range of the 5 degree elevation beam at a slant range of 100 km:
beam_distance(100000, 5)