def generate(self, epoch):
"""
@brief Calculate and update RA and Dec positions of all
beams in the tiling object.
@param epoch The epoch of tiling (unix time)
@param antennas The antennas to use when calculating the beam shape.
Note these are the antennas in katpoint CSV format.
"""
log.debug("Creating PSF simulator at reference frequency {} Hz".format(
self.reference_frequency))
psfsim = mosaic.PsfSim(self._antennas, self.reference_frequency)
log.debug(("Generating beam shape for target position {} "
"at epoch {}").format(self.target, epoch))
self.beam_shape = psfsim.get_beam_shape(self.target, epoch)
log.debug("Generating tiling of {} beams with an overlap of {}".format(
self.nbeams, self.overlap))
tiling = mosaic.generate_nbeams_tiling(
self.beam_shape, self.nbeams, self.overlap)
coordinates = tiling.get_equatorial_coordinates()
for ii in range(min(tiling.beam_num, self.nbeams)):
ra, dec = coordinates[ii]
self._beams[ii].target = Target('{},radec,{},{}'.format(
self.target.name, ra, dec))
return tiling
def generate_psf_png(self, target, reference_frequency, epoch):
psfsim = mosaic.PsfSim(self._antennas, reference_frequency)
beam_shape = psfsim.get_beam_shape(target, epoch)
png = StringIO.StringIO()
beam_shape.plot_psf(png, shape_overlay=True)
png.seek(0)
return png.read()
def generate(self, antennas, epoch):
"""
@brief Calculate and update RA and Dec positions of all
beams in the tiling object.
@param epoch The epoch of tiling (unix time)
@param antennas The antennas to use when calculating the beam shape.
Note these are the antennas in katpoint CSV format.
"""
psfsim = mosaic.PsfSim(antennas, self.reference_frequency)
beam_shape = psfsim.get_beam_shape(self.target, epoch)
tiling = mosaic.generate_nbeams_tiling(beam_shape, self.nbeams, self.overlap)
for ii in range(tiling.beam_num):
ra, dec = tiling.coordinates[ii]
self._beams[ii].target = Target('{},radec,{},{}'.format(self.target.name, ra, dec))