SpectralWindow

class SpectralWindow(spw_id: int, name: str, spw_type: str, bandwidth: float, ref_freq: dict, mean_freq: float, chan_freqs: ndarray, chan_widths: ndarray, chan_effective_bws: ndarray, sideband: int, baseband: int, receiver: str | None, freq_lo: list[float] | ndarray | None, band: str = 'Unknown', spectralspec: str | None = None, transitions: list[str] | None = None, sdm_num_bin: int | None = None, correlation_bits: str | None = None, median_receptor_angle: ndarray | None = None, specline_window: bool = False, grouping_id: str | None = None)[source]

Bases: object

A logical representation of a spectral window (spw).

id: The numerical identifier of this spectral window within the SPECTRAL_WINDOW subtable of the MeasurementSet.

band: Frequency band.

bandwidth: The total bandwidth.

baseband: The baseband.

channels: Frequency information of each channel in spectral window, i.e., frequencies, channel width, effective bandwidth.

freq_lo: A list of LO frequencies.

intents: the observing intents that have been observed using this spectral window.

mean_frequency: Mean frequency of spectral window.

name: Spectral window name.

receiver: Receiver type, e.g., 'TSB'.

ref_frequency: The reference frequency.

sideband: Side band.

transitions: Spectral transitions recorded associated with spectral window.

type: Spectral window type, e.g., 'TDM'.

sdm_num_bin: Number of bins for online spectral averaging.

correlation_bits: Number of bits used for correlation.

median_receptor_angle: Median feed receptor angle.

specline_window: Whether spw is intended for spectral line or continuum (VLA only).

grouping_id: Grouping ID to uniquely identify this spw in different MOUS within the same GOUS (ALMA-only, introduced in Cycle 12).

Attributes Summary

`band`
`bandwidth`
`baseband`
`centre_frequency`	Return the center frequency of the SpectralWindow.
`channels`
`correlation_bits`
`frame`	Return the reference frame code of the SpectralWindow.
`freq_lo`
`grouping_id`
`id`
`intents`
`max_frequency`	Return the maximum frequency of the SpectralWindow.
`mean_frequency`
`median_receptor_angle`
`min_frequency`	Return the minimum frequency of the SpectralWindow.
`name`
`num_channels`	Return the number of channels in the SpectralWindow.
`receiver`
`ref_frequency`
`sdm_num_bin`
`sideband`
`specline_window`
`spectralspec`
`transitions`
`type`

Methods Summary

channel_range(minfreq, maxfreq)

Return the channel range for given minimum/maximum frequency.

Attributes Documentation

band

bandwidth

baseband

centre_frequency: Return the center frequency of the SpectralWindow.

channels

correlation_bits

frame: Return the reference frame code of the SpectralWindow.

freq_lo

grouping_id

id

intents

max_frequency: Return the maximum frequency of the SpectralWindow.

mean_frequency

median_receptor_angle

min_frequency: Return the minimum frequency of the SpectralWindow.

name

num_channels: Return the number of channels in the SpectralWindow.

receiver

ref_frequency

sdm_num_bin

sideband

specline_window

spectralspec

transitions

type

Methods Documentation

channel_range(minfreq: Frequency, maxfreq: Frequency) → tuple[int, int] | tuple[None, None][source]

Return the channel range for given minimum/maximum frequency.

Parameters:

minfreq -- Minimum frequency as measures.Frequency object.
maxfreq -- Maximum frequency as measures.Frequency object.

Returns:

2-Tuple of integers representing indices (min, max) of channel range end-points corresponding to given min/max frequency.