An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas
Artikel i vetenskaplig tidskrift, 2011

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.

phased

reflector antenna

noise

Antenna arrays

array feeds (PAFs)

feeds

polarimetry

array signal processing

system modeling techniques

radio astronomy

efficiency

focal plane arrays

Författare

Marianna Ivashina

Chalmers

Netherlands Institute for Radio Astronomy (ASTRON)

O. Iupikov

Sevastopol National Technical University

Rob Maaskant

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Antennsystem

W. van Cappellen

Netherlands Institute for Radio Astronomy (ASTRON)

T. Oosterloo

Netherlands Institute for Radio Astronomy (ASTRON)

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 59 6 1864-1875 5725169

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/tap.2011.2123865

Mer information

Senast uppdaterat

2018-09-10