def test_create_gaintable_from_pointingtable_dynamic(self):
comp = create_skycomponent(
direction=self.phasecentre,
flux=[[1.0]],
frequency=self.frequency,
polarisation_frame=PolarisationFrame('stokesI'))
pt = create_pointingtable_from_blockvisibility(self.vis)
pt = simulate_pointingtable(pt,
pointing_error=0.01,
static_pointing_error=None,
global_pointing_error=[0.0, 0.0])
vp = create_vp(self.model, 'MID')
gt = simulate_gaintable_from_pointingtable(self.vis, [comp], pt, vp)
if self.doplot:
import matplotlib.pyplot as plt
plt.clf()
plt.plot(gt[0].time, numpy.real(1.0 / gt[0].gain[:, 0, 0, 0, 0]),
'.')
plt.plot(gt[0].time, numpy.imag(1.0 / gt[0].gain[:, 0, 0, 0, 0]),
'.')
plt.title('test_create_gaintable_from_pointingtable_dynamic')
plt.show()
assert gt[0].gain.shape == (self.ntimes, self.nants, 1, 1,
1), gt[0].gain.shape
def test_readwritepointingtable(self):
self.vis = create_blockvisibility(
self.midcore,
self.times,
self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
polarisation_frame=PolarisationFrame("linear"),
weight=1.0)
pt = create_pointingtable_from_blockvisibility(self.vis,
timeslice='auto')
pt = simulate_pointingtable(pt, pointing_error=0.1)
config = {
"buffer": {
"directory": self.dir
},
"pointingtable": {
"name": "test_bufferpointingtable.hdf",
"data_model": "PointingTable"
}
}
bdm = BufferPointingTable(config["buffer"], config["pointingtable"],
pt)
bdm.sync()
new_bdm = BufferPointingTable(config["buffer"],
config["pointingtable"])
new_bdm.sync()
newpt = bdm.memory_data_model
assert pt.data.shape == newpt.data.shape
assert numpy.max(numpy.abs(pt.pointing - newpt.pointing)) < 1e-15
def test_create_gaintable_from_pointingtable_global(self):
s3_components = [
create_test_skycomponents_from_s3(
flux_limit=5.0,
phasecentre=self.phasecentre,
frequency=self.frequency,
polarisation_frame=PolarisationFrame('stokesI'),
radius=0.2)[0]
]
pt = create_pointingtable_from_blockvisibility(self.vis)
pt = simulate_pointingtable(pt,
pointing_error=0.0,
static_pointing_error=0.0,
global_pointing_error=[0.0001, 0.0001],
config=self.vis.configuration)
import matplotlib.pyplot as plt
plt.clf()
plt.plot(pt.pointing[..., 0].flat, pt.pointing[..., 1].flat, '.')
plt.show()
vp = create_vp(self.model, 'MID')
gt = create_gaintable_from_pointingtable(self.vis, s3_components, pt,
vp)
assert gt[0].gain.shape == (3, 63, 1, 1, 1), gt[0].gain.shape
import matplotlib.pyplot as plt
plt.clf()
plt.plot(numpy.real(gt[0].gain.flat), numpy.imag(gt[0].gain.flat), '.')
plt.show()
def test_simulate_gaintable_from_time_series(self):
numpy.random.seed(18051955)
offset_phasecentre = SkyCoord(ra=+15.0 * u.deg,
dec=-44.58 * u.deg,
frame='icrs',
equinox='J2000')
component = [
Skycomponent(frequency=self.frequency,
direction=offset_phasecentre,
polarisation_frame=PolarisationFrame("stokesI"),
flux=[[1.0]])
]
for type in ['wind']:
pt = create_pointingtable_from_blockvisibility(self.vis)
import matplotlib.pyplot as plt
ant = 15
plt.clf()
plt.plot(pt.time, pt.nominal[:, ant, 0, 0, 0], '.')
plt.plot(pt.time, pt.nominal[:, ant, 0, 0, 1], '.')
plt.xlabel('Time (s)')
plt.ylabel('Nominal (rad)')
plt.title("Nominal pointing for %s" % (type))
plt.show()
for reference_pointing in [False, True]:
pt = simulate_pointingtable_from_timeseries(
pt, type=type, reference_pointing=reference_pointing)
import matplotlib.pyplot as plt
ant = 15
plt.clf()
r2a = 180.0 * 3600.0 / numpy.pi
plt.plot(pt.time, r2a * pt.pointing[:, ant, 0, 0, 0], '.')
plt.plot(pt.time, r2a * pt.pointing[:, ant, 0, 0, 1], '.')
plt.xlabel('Time (s)')
plt.ylabel('Pointing (arcsec)')
plt.title("Pointing for %s, reference pointing %s" %
(type, reference_pointing))
plt.show()
vp = create_vp(self.model, 'MID')
gt = simulate_gaintable_from_pointingtable(
self.vis, component, pt, vp)
assert gt[0].gain.shape == (self.ntimes, self.nants, 1, 1,
1), gt[0].gain.shape
plt.clf()
plt.plot(gt[0].time,
1.0 / numpy.real(gt[0].gain[:, ant, 0, 0, 0]), '.')
plt.xlabel('Time (s)')
plt.ylabel('Gain')
plt.title("Gain for %s, reference pointing %s" %
(type, reference_pointing))
plt.show()
def test_create_pointingtable(self):
beam = create_test_image(cellsize=0.0015,
phasecentre=self.vis.phasecentre,
frequency=self.frequency)
for telescope in ['MID', 'LOW', 'ASKAP']:
vp = create_vp(beam, telescope)
pt = create_pointingtable_from_blockvisibility(self.vis, vp)
pt = simulate_pointingtable(pt, 0.1, static_pointing_error=0.01)
assert pt.pointing.shape == (3, 63, 1, 1, 2), pt.pointing.shape
def test_readwritepointingtable(self):
self.vis = create_blockvisibility(self.lowcore, self.times, self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
polarisation_frame=PolarisationFrame("linear"),
weight=1.0)
gt = create_pointingtable_from_blockvisibility(self.vis, timeslice='auto')
gt = simulate_pointingtable(gt, pointing_error=0.001)
export_pointingtable_to_hdf5(gt, '%s/test_data_model_helpers_pointingtable.hdf' % self.dir)
newgt = import_pointingtable_from_hdf5('%s/test_data_model_helpers_pointingtable.hdf' % self.dir)
for key in gt.data.dtype.fields:
assert numpy.max(numpy.abs(newgt.data[key] - gt.data[key])) < 1e-15
assert gt.data.shape == newgt.data.shape
assert numpy.max(numpy.abs(gt.pointing - newgt.pointing)) < 1e-15
def test_create_gaintable_from_pointingtable(self):
s3_components = create_test_skycomponents_from_s3(
flux_limit=5.0,
phasecentre=self.phasecentre,
frequency=self.frequency,
polarisation_frame=PolarisationFrame('stokesI'),
radius=0.2)
pt = create_pointingtable_from_blockvisibility(self.vis)
pt = simulate_pointingtable(pt,
pointing_error=0.01,
static_pointing_error=[0.001, 0.0001])
vp = create_vp(self.model, 'MID')
gt = simulate_gaintable_from_pointingtable(self.vis, s3_components, pt,
vp)
assert gt[0].gain.shape == (self.ntimes, self.nants, 1, 1,
1), gt[0].gain.shape
def test_create_gaintable_from_pointingtable_circlecut(self):
self.sidelobe = SkyCoord(ra=+15.0 * u.deg,
dec=-49.4 * u.deg,
frame='icrs',
equinox='J2000')
comp = create_skycomponent(
direction=self.sidelobe,
flux=[[1.0]],
frequency=self.frequency,
polarisation_frame=PolarisationFrame('stokesI'))
telescopes = ['MID', 'MID_GAUSS', 'MID_GRASP']
for telescope in telescopes:
pt = create_pointingtable_from_blockvisibility(self.vis)
pt = simulate_pointingtable(pt,
pointing_error=0.0,
global_pointing_error=[0.0, 0.0])
vp = create_vp(self.model, telescope)
gt = simulate_gaintable_from_pointingtable(self.vis, [comp], pt,
vp)
if self.doplot:
import matplotlib.pyplot as plt
plt.clf()
plt.plot(gt[0].time,
numpy.real(1.0 / gt[0].gain[:, 0, 0, 0, 0]),
'.',
label='Real')
plt.plot(gt[0].time,
numpy.imag(1.0 / gt[0].gain[:, 0, 0, 0, 0]),
'.',
label='Imaginary')
plt.legend()
plt.xlabel('Time (s)')
plt.ylabel('Gain')
plt.title('test_create_gaintable_from_pointingtable_%s' %
telescope)
plt.show()
assert gt[0].gain.shape == (self.ntimes, self.nants, 1, 1,
1), gt[0].gain.shape
