## Description

Calculate for a set of beam elevations elev the altitudinal normalized distribution of radiated energy by those beams.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```beam_profile( height, distance, elev, antenna = 0, beam_angle = 1, k = 4/3, lat = 35, re = 6378, rp = 6357 ) ```

## Arguments

 `height` numeric. Height in meter. `distance` numeric. Distance from the radar as measured along sea level (down range) in m. `elev` numeric vector. Beam elevation(s) in degrees. `antenna` numeric. Height of the center of the radar antenna in meters `beam_angle` numeric. Beam opening angle in degrees, typically the angle between the half-power (-3 dB) points of the main lobe `k` Standard refraction coefficient. `lat` Geodetic latitude of the radar in degrees. `re` Earth equatorial radius in km. `rp` Earth polar radius in km.

## Details

Beam profile is calculated using beam_height and beam_width. Returns a beam profile as a function of height relative to ground level.

Returns the normalized altitudinal pattern of radiated energy as a function of altitude at a given distance from the radar, assuming the beams are emitted at antenna level.

## Value

numeric vector. Normalized radiated energy at each of the specified heights.

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18``` ```# plot the beam profile, for a 0.5 degree elevation beam at 50 km distance from the radar: plot(beam_profile(height = 0:4000, 50000, 0.5), 0:4000, xlab = "normalized radiated energy", ylab = "height [m]", main = "beam elevation: 0.5 deg, distance=50km" ) # plot the beam profile, for a 2 degree elevation beam at 50 km distance from the radar: plot(beam_profile(height = 0:4000, 50000, 2), 0:4000, xlab = "normalized radiated energy", ylab = "height [m]", main = "beam elevation: 2 deg, distance=50km" ) # plot the combined beam profile for a 0.5 and 2.0 degree elevation beam # at 50 km distance from the radar: plot(beam_profile(height = 0:4000, 50000, c(0.5, 2)), 0:4000, xlab = "normalized radiated energy", ylab = "height [m]", main = "beam elevations: 0.5,2 deg, distance=50km" ) ```

bioRad documentation built on July 1, 2020, 10:18 p.m.