test_visibility_operations.py 文件源码

def setUp(self):
        self.lowcore = create_named_configuration('LOWBD2-CORE')
        self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 300.0, 30.0)
        self.frequency = numpy.linspace(1.0e8, 1.1e8, 3)
        self.channel_bandwidth = numpy.array([1e7, 1e7, 1e7])
        # Define the component and give it some spectral behaviour
        f = numpy.array([100.0, 20.0, -10.0, 1.0])
        self.flux = numpy.array([f, 0.8 * f, 0.6 * f])

        # The phase centre is absolute and the component is specified relative (for now).
        # This means that the component should end up at the position phasecentre+compredirection
        self.phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
        self.compabsdirection = SkyCoord(ra=+181.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
        pcof = self.phasecentre.skyoffset_frame()
        self.compreldirection = self.compabsdirection.transform_to(pcof)
        self.comp = Skycomponent(direction=self.compreldirection, frequency=self.frequency, flux=self.flux)