argosim.beam_utils module

Beam utils.

This module contains the beam class to generate the primary beam of the antennas.

Authors:

Ezequiel Centofanti <ezequiel.centofanti@cea.fr>

class argosim.beam_utils.CosCubeBeam(c=0.2, f=1.0, n_pix=100, fov_deg=1.0)

Bases: object

Cosine cubed beam.

Class to model the primary beam of the antennas using a cosine cubed function.

c

The multiplicative constant of the cosine argument.

Type:

float

f

The frequency in GHz at which the beam is evaluated.

Type:

float

grid_size

The number of pixels of the simulated field of view.

Type:

int

fov_deg

The simulated field of view in degrees.

Type:

float

Methods

Cf()	Cf.
__call__(l, m)	Cosine cubed beam.
beam_edge()	Beam edge.
check_fov()	Check FOV.
evaluate_beam_fit(freqs, norm_beam_list)	Evaluate beam fit.
fov_solid_angle([r_fov])	FOV solid angle.
get_beam()	Get beam.
get_mesh()	Get mesh.
plot_beam_1d(freqs)	Plot beam 1D.
plot_beam_2d()	Plot beam 2D.
r_fov()	FOV radius.
set_c(c)	Set c.
set_f(f)	Set f.
set_fov(fov_deg)	Set FOV.

Cf()

Cf.

Function to compute the Cf parameter.

Returns:

Cf – The Cf parameter.

Return type:

float

beam_edge()

Beam edge.

Function to compute the beam edge (where the beam reaches zero).

Returns:

beam_edge – The beam edge in degrees.

Return type:

float

check_fov()

Check FOV.

Function to check if the desired FOV is too large for the beam size.

evaluate_beam_fit(freqs, norm_beam_list)

Evaluate beam fit.

Function to evaluate the beam fit at the given frequencies and compare it with the beam measurements.

Parameters:

• freqs (list) – The list of frequencies in GHz at which the beam is evaluated.

• norm_beam_list (list) – The list of normalized beam measurements (amplitude not dB).

fov_solid_angle(r_fov=None)

FOV solid angle.

Compute the solid angle of the FOV.

Parameters:

r_fov (float) – The beam width at -3 dB in degrees.

Returns:

solid_angle – The solid angle of the FOV in square degrees.

Return type:

float

get_beam()

Get beam.

Function to compute the beam amplitude.

Returns:

z – The beam amplitude.

Return type:

np.ndarray

get_mesh()

Get mesh.

Function to compute the meshgrid of the lm image plane.

Returns:

• l (np.ndarray) – The l coordinate of the image plane.

• m (np.ndarray) – The m coordinate of the image plane.

plot_beam_1d(freqs)

Plot beam 1D.

Function to plot the simulated beam in 1D as a function of the angle.

Parameters:

freqs (list) – The list of frequencies in GHz at which the beam is evaluated.

plot_beam_2d()

Plot beam 2D.

Function to plot the simulated beam in 2D over the field of view.

r_fov()

FOV radius.

Function to compute the radius of the beam at -3 dB.

Returns:

r_fov – The radius of the beam at -3 dB.

Return type:

float

set_c(c)

Set c.

Parameters:

c (float) – The multiplicative constant of the cosine argument.

set_f(f)

Set f.

Parameters:

f (float) – The frequency in GHz at which the beam is evaluated.

set_fov(fov_deg)

Set FOV.

Parameters:

fov_deg (float) – The simulated field of view in degrees.