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• W2107376985 abstract "We describe the design and construction of a dual-polarized phased-array feed (PAF) with the purpose of demonstrating this technology as a means of expanding the instantaneous field-of-view of radio telescopes. The PAF beamformer is calibrated with observations of an unpolarized astronomical radio source, the covariance matrix of all receiver channels is calculated, and the two dominant eigenvectors are then used as beamformer weights. We show measurements demonstrating the capabilities of this instrument as a polarimeter, and confirm that the calibration method does produce orthogonally-polarized beams. These results are then analyzed to show the sensitivity to fluctuations in gain and phase in the multiple parallel receiver chains making up the phased-array feed. We also compare the performance of PAFs that beamform all array elements with PAFs that beamform only co-polarized elements." @default.
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• W2107376985 date "2011-06-01" @default.
• W2107376985 modified "2023-10-16" @default.
• W2107376985 title "Demonstration of a Dual-Polarized Phased-Array Feed" @default.
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• W2107376985 doi "https://doi.org/10.1109/tap.2011.2122231" @default.
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