drift.telescope.exotic_cylinder

Classes

`CylinderExtra`([latitude, longitude])	Initialise a telescope object.
`CylinderPerturbed`([latitude, longitude])	A base for a polarised telescope.
`CylinderShift`([latitude, longitude])	Initialise a telescope object.
`GradientCylinder`([latitude, longitude])	Initialise a telescope object.
`RandomCylinder`([latitude, longitude])	Initialise a telescope object.

class drift.telescope.exotic_cylinder.CylinderExtra(latitude=45, longitude=0, **kwargs)

Bases: UnpolarisedCylinderTelescope

Initialise a telescope object.

Parameters:

latitude (scalar) – Position on the Earths surface of the telescope (in degrees).
longitude (scalar) – Position on the Earths surface of the telescope (in degrees).

feed_positions_cylinder(cylinder_index)

Get the feed positions on the specified cylinder.

Parameters:: cylinder_index (integer) – The cylinder index, an integer from 0 to self.num_cylinders.
Returns:: feed_positions – The positions in the telescope plane of the receivers. Packed as [[u1, v1], [u2, v2], …].
Return type:: np.ndarray

class drift.telescope.exotic_cylinder.CylinderPerturbed(latitude=45, longitude=0, **kwargs)

Bases: PolarisedCylinderTelescope

A base for a polarised telescope.

Again, an abstract class, but the only things that require implementing are the feedpositions, _get_unique and the beam functions beamx and beamy.

beamx, beamy : methods: (abstract methods) Routines giving the field pattern for the x and y feeds.

Initialise a telescope object.

Parameters:

latitude (scalar) – Position on the Earths surface of the telescope (in degrees).
longitude (scalar) – Position on the Earths surface of the telescope (in degrees).

property beamclass: Simple beam mode of dual polarisation feeds.

beamx(feed, freq)

Beam for the x polarisation feed.

Parameters:

feed (integer) – Index for the feed.
freq (integer) – Index for the frequency.

Returns:

beam – Healpix maps (of size [self._nside, 2]) of the field pattern in the theta and phi directions.

Return type:

np.ndarray

beamy(feed, freq)

Beam for the x polarisation feed.

Parameters:

feed (integer) – Index for the feed.
freq (integer) – Index for the frequency.

Returns:

beam – Healpix maps (of size [self._nside, 2]) of the field pattern in the theta and phi directions.

Return type:

np.ndarray

property feedpositions: An (nfeed,2) array of the feed positions relative to an arbitary point (in m)

class drift.telescope.exotic_cylinder.CylinderShift(latitude=45, longitude=0, **kwargs)

Bases: UnpolarisedCylinderTelescope

Initialise a telescope object.

Parameters:

latitude (scalar) – Position on the Earths surface of the telescope (in degrees).
longitude (scalar) – Position on the Earths surface of the telescope (in degrees).

feed_positions_cylinder(cylinder_index)

Get the feed positions on the specified cylinder.

Parameters:: cylinder_index (integer) – The cylinder index, an integer from 0 to self.num_cylinders.
Returns:: feed_positions – The positions in the telescope plane of the receivers. Packed as [[u1, v1], [u2, v2], …].
Return type:: np.ndarray

class drift.telescope.exotic_cylinder.GradientCylinder(latitude=45, longitude=0, **kwargs)

Bases: UnpolarisedCylinderTelescope

Initialise a telescope object.

Parameters:

latitude (scalar) – Position on the Earths surface of the telescope (in degrees).
longitude (scalar) – Position on the Earths surface of the telescope (in degrees).

feed_positions_cylinder(cylinder_index)

Get the feed positions on the specified cylinder.

Parameters:: cylinder_index (integer) – The cylinder index, an integer from 0 to self.num_cylinders.
Returns:: feed_positions – The positions in the telescope plane of the receivers. Packed as [[u1, v1], [u2, v2], …].
Return type:: np.ndarray

class drift.telescope.exotic_cylinder.RandomCylinder(latitude=45, longitude=0, **kwargs)

Bases: UnpolarisedCylinderTelescope

Initialise a telescope object.

Parameters:

latitude (scalar) – Position on the Earths surface of the telescope (in degrees).
longitude (scalar) – Position on the Earths surface of the telescope (in degrees).

feed_positions_cylinder(cylinder_index)

Get the feed positions on the specified cylinder.

Parameters:: cylinder_index (integer) – The cylinder index, an integer from 0 to self.num_cylinders.
Returns:: feed_positions – The positions in the telescope plane of the receivers. Packed as [[u1, v1], [u2, v2], …].
Return type:: np.ndarray