pipeline.extern.sensitivity_improvement¶
Functions
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For Cycle 3-onward data, determines the channel averaging factor from the ratio of the effective channel bandwidth to the channel width. |
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Computes the expected factor of improvement in sensitivity expected when making images of ALMA data with channel widths wider than the observed width. vis: name of measurement set spw: single spw index (integer) newchanwidth: width of image channel in units of the uvdata channel width, or a string with any common frequency units (‘MHz’ etc.) or ‘km/s’ useCAS8534: if True, use the approximate formula developed for the imaging pipeline; if False, use a spline fit to the integral table of values (1,2,4,8,16) cubechanwidth: if specified, then compute the improvement with respect to this chanwidth (which might be larger than the observed chanwidth). Units: Width of image channel in units of the uvdata channel width, or a string with any common frequency units (‘MHz’ etc.) or ‘km/s’ -Todd Hunter. |
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Print the FWHM and Effective sensitivity bandwidth of each of the ALMA correlator window functions, or return the value for a specific choice. The values are taken from the tables in Richard Hills’ note of April 8, 2012. window: one of [‘’, ‘uniform’,’hanning’,’welch’,’cosine’,’hamming’,’bartlett’, ‘blackmann’,’blackmann-harris’] ‘’=prints the whole table channelAveraging: 1, 2, 4, 8, or 16; >16 will return channelAveraging, other values will be spline interpolated returnValue: ‘FWHM’ or ‘EffectiveBW’ or ‘dictionary’ splineDegree: passed as the k parameter to scipy.interpolate.UnivariateSpline splineSmoothing: passed as the s parameter to scipy.interpolate.UnivariateSpline ratio: if True, then divide by the channelAveraging factor useCAS8534: uses the approximate formula developed for the pipeline rather than a spline spwchan: number of channels in spw (only used if useCAS8534=True) nchan: number of channels being combined (only used if useCAS8534=True) Returns: The effective number of native channels supplied by a single channel. -Todd Hunter. |