5.1.1.0 sd.apexcal

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sd.apexcal - Function

5.1.1 Calibration function specific for APEX data
Description

This method is properly defined for calibration of APEX data. Input data must be a scantable object. The calibration scheme is essentially same as ALMA data,

T* = T ON----OF-F-, a sys OF F

where T_a^* is an antenna temperature, T_sys is a system temperature, ON and OFF are raw (uncalibrated) spectral data that correspond to on-source and off-source position, respectively. Only difference with ALMA calibration is that T_sys doesn’t provided. Instead, it is computed from a calibration temperature and two calibration scans: a blank sky and a load with known temperature. The OFF scan is linearly interpolated in time if it exists in the vicinity of target ON scan. The calmode argument specifies calibration mode. Supported calibration modes are ’ps’ (position switch) and ’fs’ (frequency switch). The ’ps’ includes calibration for nutator switching as well as classical position switching.

Arguments


Inputs
scantab	input data as a scantable
	allowed:	scantable
	Default:
scannos	a list of scan numbers to be calibrated
	allowed:	(list of) integer, string
	Default:	[] (all data)
calmode	Calibration mode
	allowed:	string (’ps’, ’fs’, ’none’)
	Default:	’none’
verify	Verify calibration if True
	allowed:	bool
	Default:	False

Returns
scantable

Example

s=sd.scantable(’alma-scans.asap’,average=False,getpt=True)
scal=sd.apexcal(s,calmode=’ps’)

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