Todo
Insert todo’s here
sensitivity_calculator.mid_utilities
Module holding functions useful to the MidCalculator
- sensitivity_calculator.mid_utilities.Tgal(target, obs_freq, dish_type, alpha)[source]
Brightness temperature of Galactic background in target direction at observing frequency.
- sensitivity_calculator.mid_utilities.Trcv(obs_freq, obs_band, dish_type)[source]
Receiver temperature for specified freq, band and dish.
- sensitivity_calculator.mid_utilities.Tsky(Tgal, obs_freq, elevation, weather)[source]
Brightness temperature of sky in target direction.
- Parameters
Tgal (astropy.units.Quantity) – brightness temperature of Galactic background
obs_freq (astropy.units.Quantity) – the observing frequency
elevation (astropy.units.Quantity) – the observing elevation
weather (float) – the atmosphere PWV
- Returns
the brightness temperature of the sky
- Return type
astropy.units.Quantity
- sensitivity_calculator.mid_utilities.Tspl(dish_type)[source]
Spillover temperature for specified dish type.
- Parameters
dish_type (DishType) – the type of dish
- Returns
the spillover temperature
- Return type
astropy.units.Quantity
- sensitivity_calculator.mid_utilities.Tsys_dish(Trcv, Tspl, Tsky, obs_freq)[source]
System temperature.
- Parameters
Trcv (astropy.units.Quantity) – the receiver temperature
Tspl (astropy.units.Quantity) – the spillover temperature
Tsky (astropy.units.Quantity) – the sky temperature
obs_freq (astropy.units.Quantity) – the observing frequency
- Returns
the dish system temperature
- Return type
astropy.units.Quantity
- sensitivity_calculator.mid_utilities.eta_bandpass()[source]
Efficiency factor for due to the departure of the bandpass from an ideal, rectangular shape. For now this is a placeholder.
- Returns
the efficiency, eta
- Return type
- sensitivity_calculator.mid_utilities.eta_coherence(obs_freq)[source]
Efficiency factor for the sensitivity degradation due to the incoherence on a baseline.
- Parameters
obs_freq (astropy.units.Quantity) – the observing frequency
- Returns
the efficiency, eta
- Return type
- sensitivity_calculator.mid_utilities.eta_correlation()[source]
Efficiency factor due to imperfection in the correlation algorithm, e.g. truncation error.
- Returns
the efficiency, eta
- Return type
- sensitivity_calculator.mid_utilities.eta_digitisation(obs_band)[source]
Efficiency factor due to losses from quantisation during signal digitisation. This process is independent of the telescope and environment, but only depends on the ‘effective number of bits’ (ENOB) of the system, which depends in turn on digitiser quality and clock jitter, and on band flatness.
- sensitivity_calculator.mid_utilities.eta_dish(obs_freq, dish_type)[source]
Efficiency factor due to losses for specified dish type.
- sensitivity_calculator.mid_utilities.eta_point(obs_freq, dish_type)[source]
Efficiency factor at the observing frequency due to the dish pointing error.
- sensitivity_calculator.mid_utilities.eta_rfi()[source]
Efficiency factor due to Radio Frequency Interference (RFI)
- Returns
the efficiency, eta
- Return type
- sensitivity_calculator.mid_utilities.eta_system(eta_point, eta_coherence, eta_digitisation, eta_correlation, eta_bandpass)[source]
System efficiency for SKA interferometer
- Parameters
eta_point (float) – efficiency loss due to pointing errors
eta_coherence (float) – efficiency due to loss of coherence
eta_digitisation (float) – efficiency loss due to errors in the digitisation process
eta_correlation (float) – efficiency loss due to errors in the correlation process
eta_bandpass (float) – efficiency loss due to the bandpass not being rectangular
- Returns
the system efficiency
- Return type