def test_sample_lm_broadcast(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
l = np.array([0.01, 0.02])
m = np.array([0.03, -0.04, 0.01])
frequency = 1500 * u.MHz
actual = aperture_plane_model.sample(l[np.newaxis, :], m[:, np.newaxis],
frequency, primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
expected = np.zeros((len(m), len(l), 2, 2), np.complex64)
for i in range(len(m)):
for j in range(len(l)):
expected[i, j] = aperture_plane_model.sample(
l[j], m[i], frequency, primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
# It isn't exact, presumably because the matrix multiplications sum
# in a different order depending on size.
np.testing.assert_allclose(actual, expected, atol=1e-7)
# Also check with RADecFrame
actual = aperture_plane_model.sample(
-l[np.newaxis, :], m[:, np.newaxis], frequency,
primary_beam.RADecFrame.from_parallactic_angle(0 * u.deg),
primary_beam.OutputType.JONES_HV)
np.testing.assert_allclose(actual, expected, atol=1e-7)
def test_sample_scalar_lm(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
l = 0.01
m = 0.02
frequency = 1500 * u.MHz
scalar = aperture_plane_model.sample(l, m, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
vector = aperture_plane_model.sample(np.array([l]), np.array([m]),
frequency, primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
assert scalar.shape == (2, 2)
np.testing.assert_array_equal(scalar, vector[0])
def test_sample_radec(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane,
lat: u.Quantity) -> None:
model = aperture_plane_model
location = EarthLocation.from_geodetic(18 * u.deg,
lat=lat,
height=100 * u.m)
obstime = Time('2021-04-22T13:00:00Z')
frequency = 1 * u.GHz
altaz_frame = AltAz(obstime=obstime, location=location)
target_altaz = SkyCoord(alt=70 * u.deg, az=150 * u.deg, frame=altaz_frame)
l_altaz = [-0.002, 0.001, 0.0, 0.0, 0.0]
m_altaz = [0.0, 0.02, 0.0, -0.03, 0.01]
coords_altaz = _lm_to_coords(l_altaz, m_altaz, target_altaz)
target_icrs = target_altaz.icrs
coords_icrs = coords_altaz.icrs
l_icrs, m_icrs = _coords_to_lm(coords_icrs, target_icrs)
out_radec = model.sample(
l_icrs, m_icrs, frequency,
primary_beam.RADecFrame.from_sky_coord(target_icrs),
primary_beam.OutputType.JONES_HV)
out_altaz = model.sample(l_altaz, m_altaz, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
# Tolerance is high because RADecFrame doesn't account for aberration
np.testing.assert_allclose(out_radec, out_altaz, atol=1e-4)
def test_sample_out_of_range(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane, l: float,
m: float, frequency: u.Quantity) -> None:
actual = aperture_plane_model.sample(l, m, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
expected = np.full((2, 2), np.nan)
np.testing.assert_array_equal(actual, expected)
def test_sample_multi_dim_lm(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
rs = np.random.RandomState(1)
shape = (2, 3, 4)
l = rs.random(shape) * 0.05
m = rs.random(shape) * 0.05
frequency = 1500 * u.MHz
multi = aperture_plane_model.sample(l, m, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
flat = aperture_plane_model.sample(l.ravel(), m.ravel(), frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
np.testing.assert_array_equal(multi, flat.reshape(multi.shape))
# Make sure that we're comparing meaningful values, not just NaNs
assert not np.any(np.isnan(multi))
def test_sample_lm_np_flags(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
"""Check that flags on l and m arrays are not modified."""
l = np.array([0.01, 0.02])
m = np.array([0.03, 0.04])
aperture_plane_model.sample(l, m, 1500 * u.MHz, primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
assert l.flags.writeable
assert m.flags.writeable
def test_sample_frequency_array(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
l = np.array([0.01])
m = np.array([0.02])
frequency = np.array([[1000, 1200], [1100, 1500]]) * u.MHz
# Evaluate one frequency at a time
expected = np.zeros(frequency.shape + (1, 2, 2), np.complex64)
# Astropy units don't work with np.ndenumerate, hence npindex instead
for idx in np.ndindex(frequency.shape):
expected[idx] = aperture_plane_model.sample(
l, m, frequency[idx], primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
# Evaluate them all together
actual = aperture_plane_model.sample(l, m, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
np.testing.assert_array_equal(actual, expected)
def test_sample_bad_out(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane,
out: np.ndarray, expectation) -> None:
model = aperture_plane_model
l = np.array([0.01])
m = np.array([0.02])
frequency = np.array([[1000, 1200], [1100, 1500]]) * u.MHz
with expectation:
model.sample(l,
m,
frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV,
out=out)
def test_sample_interp_scalar_freq(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
model = aperture_plane_model
l = [0.0, 0.05, -0.02]
m = [0.0, 0.03, 0.04]
frequency_idx = 50
frequency = np.mean(model.frequency[frequency_idx:frequency_idx + 2])
actual = aperture_plane_model.sample(l, m, frequency,
primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
samples = np.mean(model.samples[frequency_idx:frequency_idx + 2], axis=0)
expected = _compute_expected(model, samples, l, m, frequency)
# atol is more appropriate than rtol since there is cancellation of small terms
np.testing.assert_allclose(actual, expected, rtol=0, atol=1e-6)
# Check that we get identity matrix at the origin
np.testing.assert_allclose(actual[0], np.eye(2), rtol=0, atol=1e-6)
def test_sample_partially_out_of_range(
aperture_plane_model: primary_beam.PrimaryBeamAperturePlane) -> None:
model = aperture_plane_model
l = [0.1, -0.19, 0.21] # 0.2 is (roughly) the limit at 1.5 GHz
m = [0.0]
frequency = [1000, 1500, 1630, 2000] * u.MHz
actual = model.sample(l, m, frequency, primary_beam.AltAzFrame(),
primary_beam.OutputType.JONES_HV)
expected_nan = np.array([
[False, False, False],
[False, False, True],
[False, True, True],
[True, True, True] # frequency is out of range
])
for i in range(2):
for j in range(2):
np.testing.assert_array_equal(np.isnan(actual[..., i, j]),
expected_nan)
from astropy.coordinates import EarthLocation, AltAz, SkyCoord, CartesianRepresentation
from astropy.time import Time
import numpy as np
try:
from numpy.typing import ArrayLike
except ImportError:
ArrayLike = Any # type: ignore
import h5py
import pytest
from katsdpmodels import models, primary_beam
import katsdpmodels.fetch.requests as fetch_requests
FRAME_OUTPUT_TYPE_COMBOS = [
(frame, output_type) for frame in [
primary_beam.AltAzFrame(),
primary_beam.RADecFrame.from_parallactic_angle(40 * u.deg),
primary_beam.RADecFrame.from_parallactic_angle([[40], [80]] * u.deg)
] for output_type in primary_beam.OutputType
if (isinstance(frame, primary_beam.RADecFrame) or output_type in {
primary_beam.OutputType.JONES_HV,
primary_beam.OutputType.UNPOLARIZED_POWER
})
]
@pytest.fixture
def aperture_plane_model_file(tmp_path) -> h5py.File:
"""Create an aperture-plane model for testing.
It writes the model directly rather than using the PrimaryBeam API