test_imaging_params.py 文件源码

def setUp(self):
        self.dir = './test_results'
        os.makedirs(self.dir, exist_ok=True)

        self.vnchan = 5
        self.lowcore = create_named_configuration('LOWBD2-CORE')
        self.times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 7)
        self.frequency = numpy.linspace(8e7, 1.2e8, self.vnchan)
        self.startfrequency = numpy.array([8e7])
        self.channel_bandwidth = numpy.array(self.vnchan * [self.frequency[1] - self.frequency[0]])
        self.phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox='J2000')
        self.vis = create_visibility(self.lowcore, times=self.times, frequency=self.frequency,
                                     phasecentre=self.phasecentre, weight=1.0,
                                     polarisation_frame=PolarisationFrame('stokesI'),
                                     channel_bandwidth=self.channel_bandwidth)
        self.model = create_image_from_visibility(self.vis, npixel=512, cellsize=0.001,
                                                  nchan=self.vnchan,
                                                  frequency=self.startfrequency)