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• W3022551946 abstract "Future generations of radio interferometers targeting the 21,cm signal at cosmological distances with $Ngg 1000$ antennas could face a significant computational challenge in building correlators with the traditional architecture, whose computational resource requirement scales as $mathcal{O}(N^2)$ with array size. The fundamental output of such correlators is the cross-correlation products of all antenna pairs in the array. The FFT-correlator architecture reduces the computational resources scaling to $mathcal{O}(Nlog{N})$ by computing cross-correlation products through a spatial Fourier transform. However, the output of the FFT-correlator is meaningful only when the input antenna voltages are gain- and phase-calibrated. Traditionally, interferometric calibration has used the $mathcal{O}(N^2)$ cross-correlations produced by a standard correlator. This paper proposes two real-time calibration schemes that could work in parallel with an FFT-correlator as a self-contained $mathcal{O}(Nlog{N})$ correlator system that can be scaled to large-N redundant arrays. We compare the performance and scalability of these two calibration schemes and find that they result in antenna gains whose variance decreases as $1/log{N}$ with increase in the size of the array." @default.
• W3022551946 created "2020-05-13" @default.
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• W3022551946 date "2020-10-22" @default.
• W3022551946 modified "2023-09-23" @default.
• W3022551946 title "Calibration schemes with O(N log N) scaling for large-N radio interferometers built on a regular grid" @default.
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• W3022551946 doi "https://doi.org/10.1093/mnras/staa3229" @default.
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