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Redundant interferometric calibration as a complex optimization problem
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DOI：10.1093/mnras/sty357.png)
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Abstract
En 中文
Observations of the redshifted 21 cm line from the epoch of reionization have recently motivated the construction of low-frequency radio arrays with highly redundant configurations. These configurations provide an alternative calibration strategy - 'redundant calibration' and boost sensitivity on specific spatial scales. In this paper, we formulate calibration of redundant interferometric arrays as a complex optimization problem. We solve this optimization problem via the Levenberg-Marquardt algorithm. This calibration approach is more robust to initial conditions than current algorithms and, by leveraging an approximate matrix inversion, allows for further optimization and an efficient implementation ('redundant STEFCAL'). We also investigated using the preconditioned conjugate gradient method as an alternative to the approximate matrix inverse, but found that its computational performance is not competitive with respect to 'redundant STEFCAL'. The efficient implementation of this new algorithm is made publicly available.
Keywords:
instrumentation: interferometers
methods: data analysis
methods: numerical
techniques: interferometric
cosmology: observations
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