|Continuum centre frequency:||MHz|
|Specific zoom frequency:||MHz|
|Maximum baseline and configuration:|
|Number of 4cm receivers:|
|CABB frequency resolution:|
|Zoom channels to concatenate:|
|Line Rest Frequency:||GHz|
|Image Weighting Scheme:|
|Smoothing filter width:|
|Discard self-generated birdies?:|
|Discard known RFI frequency bands?:|
|Number of edge channels to discard:|
This is the Australia Telescope Compact Array (ATCA) sensitivity calculator. It provides a means of estimating the characteristics of ATCA observations with the Compact Array Broadband Backend (CABB) system. The calculator allows both available and planned CABB modes to be selected: please check the CABB webpage for the modes that have been implemented.
The pre-CABB sensitivity calculator is still available and may be useful for those considering archival ATCA data.
This page is specifically built to give fast access to all the available input parameters, but uses the same calculator as the user-friendly calculator found here. Users who require extra assistance may choose to use the alternate page.
This calculator stores the parameters as part of the address bar, allowing the user to bookmark this page and keep the calculation.
The calculator includes the theoretical RMS noise in a resultant image/cube (Stokes I, Q, U or V). The corresponding brightness temperature sensitivity is also calculated. These estimates are based on the expressions appearing in the ATNF technical document AT/01.17/025, the calculations of antenna efficiency as a function of frequency, revised (CABB era) measurements of system temperature as a function of frequency, and simulations of the effects of different weighting schemes on images made with different ATCA configurations. In calculating the effects of weighting, 30 second samples and Miriad default cell and image sizes were assumed.
It is assumed that the nominated integration time is evenly spread over the period the source is above the set elevation limit. Note the time given is the integration time: this does not account for overheads involved in calibration. Depending on the calibration scheme used, these overheads might vary between 5% for simple 16cm observations, to 50% for 3mm observations.
Questions, comments and issues should be addressed to Jamie (dot) Stevens (at) csiro (dot) au.
Calculation and Results
|Array||# Antenna: # Baselines: Antenna Efficiency:|
|Imaging||Velocity Reference Frequency: Weighting: Weighting Factor: x Natural Continuum Primary Beam FWHM: Specific Zoom Primary Beam FWHM: N/A Continuum Synthesised Beam FWHM: Specific Zoom Synthesised Beam FWHM: N/A|
|Continuum||Bandwidth: 2048 MHz Velocity Width: Effective Bandwidth:|
|Spectral||Frequency Resolution: Velocity Resolution:|
|Zoom||# Concatenated Channels: Total Bandwidth: # Channels: Frequency Resolution: Velocity Width: Velocity Resolution:|