Built-in Scan Pattern Reference

This page contains the API reference for the built-in scan patterns of gateau. More...

Functions
Union[np.ndarray, np.ndarray]	gateau.scan_patterns.stare (np.ndarray times, Union[float, np.ndarray] az0, Union[float, np.ndarray] el0)
	Get scanning pattern for a stare. More...
Union[np.ndarray, np.ndarray]	gateau.scan_patterns.chop (np.ndarray times, Union[float, np.ndarray] az0, Union[float, np.ndarray] el0, float duty_cycle, float throw)
	Get scanning pattern for a sky chopper, alternating between two points on sky. More...
Union[np.ndarray, np.ndarray]	gateau.scan_patterns.daisy (np.ndarray times, Union[float, np.ndarray] az0, Union[float, np.ndarray] el0, float r_petal, float f_cycle, float f_petal)
	Get scanning pattern for a daisy scan. More...
Union[np.ndarray, np.ndarray]	gateau.scan_patterns.chopnod (np.ndarray times, Union[float, np.ndarray] az0, Union[float, np.ndarray] el0, float chop_duty_cycle, float nod_duty_cycle, float throw)
	Get scanning pattern for chopping and nodding. More...

Detailed Description

This page contains the API reference for the built-in scan patterns of gateau.

Function Documentation

chop()

Union[np.ndarray, np.ndarray] gateau.scan_patterns.chop	(	np.ndarray	times,
		Union[float, np.ndarray]	az0,
		Union[float, np.ndarray]	el0,
		float	duty_cycle,
		float	throw
	)

Get scanning pattern for a sky chopper, alternating between two points on sky.

Currently, only chopping in azimuth direction is supported.

Parameters

times	Numpy array containing times of scan. Units: seconds.
az0	Azimuth co-ordinate of the reference chop position. Units: deg.
el0	Elevation co-ordinate to stare at. Units: deg.
duty_cycle	Frequency of a full revolution of the chopper blade. Units: Hz.
throw	Angular distance between reference chop and other chop. Units: deg.

Returns

Array of azimuth and elevation co-ordinates for the observation.

chopnod()

Union[np.ndarray, np.ndarray] gateau.scan_patterns.chopnod	(	np.ndarray	times,
		Union[float, np.ndarray]	az0,
		Union[float, np.ndarray]	el0,
		float	chop_duty_cycle,
		float	nod_duty_cycle,
		float	throw
	)

Get scanning pattern for chopping and nodding.

In this observation mode, the telescope observes 3 positions: one on-source and two off-source. It first rapidly chops between the on-source and one of the off-source position. Then it moves to alternating between on-source and the other off-source position. Currently, only chopping and nodding in azimuth direction is supported.

Parameters

times	Numpy array containing times of scan. Units: seconds.
az0	Azimuth co-ordinate of the reference chop position. Units: deg.
el0	Elevation co-ordinate to stare at. Units: deg.
chop_duty_cycle	Frequency of a full revolution of the chopper blade. Units: Hz.
nod_duty_cycle	Frequency of a full nod cycle (both telescope positions). Units: Hz.
throw	Angular distance between reference chop and other chop. Units: deg.

Returns

Array of azimuth and elevation co-ordinates for the observation.

daisy()

Union[np.ndarray, np.ndarray] gateau.scan_patterns.daisy	(	np.ndarray	times,
		Union[float, np.ndarray]	az0,
		Union[float, np.ndarray]	el0,
		float	r_petal,
		float	f_cycle,
		float	f_petal
	)

Get scanning pattern for a daisy scan.

Parameters

times	Numpy array containing times of scan. Units: seconds.
az0	Azimuth co-ordinate of the center of the daisy scan. Units: deg.
el0	Elevation co-ordinate of the center of the daisy scan. Units: deg.
r_petal	Distance of center of scan to edge of the petal. Units: deg.
f_cycle	Frequency of a full cycle. Units: Hz.
f_petal	Frequency of a single petal. Units: Hz.

Returns

Array of azimuth and elevation co-ordinates for the observation.

stare()

Union[np.ndarray, np.ndarray] gateau.scan_patterns.stare	(	np.ndarray	times,
		Union[float, np.ndarray]	az0,
		Union[float, np.ndarray]	el0
	)

Get scanning pattern for a stare.

Parameters

times	Numpy array containing times of scan.
az0	Azimuth co-ordinate to stare at.
el0	Elevation co-ordinate to stare at.

Returns

Array of azimuth and elevation co-ordinates for the observation.