An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas
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TLDR
An optimal beamforming strategy is proposed for performing large-field surveys with dual-polarized phased-array-fed reflector antennas and the obtained numerical results demonstrate a very good agreement with the measurements performed at the telescope.Abstract:
An optimal beamforming strategy is proposed for performing large-field surveys with dual-polarized phased-array-fed reflector antennas. This strategy uses signal-processing algorithms that maximize the beam sensitivity and the continuity of a field of view (FOV) that is formed by multiple closely overlapping beams. A mathematical framework and a newly developed numerical approach are described to analyze and optimize a phased array feed (PAF) system. The modeling approach has been applied to an experimental PAF system (APERTIF prototype) that is installed on the Westerbork Synthesis Radio Telescope. The resulting beam shapes, sensitivity, and polarization diversity characteristics (such as the beam orthogonality and the intrinsic cross-polarization ratio) are examined over a large FOV and frequency bandwidth. We consider weighting schemes to achieve a conjugate-field matched situation (max. received power), maximum signal-to-noise ratio (SNR), and a reduced SNR scenario but with constraints on the beam shape. The latter improves the rotational symmetry of the beam and reduces the sensitivity ripple, at a modest maximum sensitivity penalty. The obtained numerical results demonstrate a very good agreement with the measurements performed at the telescope.read more
Citations
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References
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TL;DR: The present work focuses on the characterization of Space-Time Processes of Array Processing Literature and its applications to Arrays and Spatial Filters and Parameter Estimation of Adaptive Beamformers.
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The definition of cross polarization
TL;DR: There are at least three different definitions of cross polarization used in the literature, and the definition which corresponds to one standard measurement practice is proposed as the best choice.
Journal ArticleDOI
Understanding radio polarimetry. I. Mathematical foundations
TL;DR: In this article, the authors show that the mathematical operation of outer matrix multiplication provides the missing link between radio interferometry and optical polarimetry, and propose a unified framework of Stokes parameters and Wolf coherency matrix, the Jones and Mueller calculi from optics, and the techniques of Radio Interferometry based on multiplying correlators.
Journal ArticleDOI
Australian SKA Pathfinder: A High-Dynamic Range Wide-Field of View Survey Telescope
David DeBoer,R. G. Gough,John D. Bunton,Tim J. Cornwell,Ron Beresford,Simon Johnston,Ilana Feain,Antony Schinckel,Carole Jackson,M. J. Kesteven,Aaron Chippendale,Grant Hampson,J. D. O'Sullivan,Stuart G. Hay,C. E. Jacka,T. Sweetnam,Michelle C. Storey,L. Ball,B. J. Boyle +18 more
TL;DR: The Australia SKA Pathfinder (ASKAP) as mentioned in this paper is a high-dynamic-range wide-field-of-view (WFOV) survey instrument that will utilize focal plane phased array feeds on the 36 12m antennas that will compose the array.