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Performance of polarimetric beamformers for phased array radio telescopes

Marianna Ivashina (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling) ; S. J. Wijnholds ; Rob Maaskant (Institutionen för signaler och system, Antenner) ; K. F. Warnick
30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, Istanbul, 13-20 August 2011 (2011)
[Konferensbidrag, refereegranskat]

The results of four recently introduced beamforming schemes for phased array systems are discussed, each of which is capable to provide high sensitivity and accurate polarimetric performance of array-based radio telescopes. Ideally, a radio polarimeter should recover the actual polarization state of the celestial source, and thus compensate for unwanted polarization degradation effects which are intrinsic to the instrument. In this paper, we compare the proposed beamforming schemes through an example of a practical phased array system (APERTIF prototype) and demonstrate that the optimal beamformer, the max-SLNR beamformer, the eigenvector beamformer, and the bi-scalar beamformer are sensitivity equivalent but lead to different polarization state solutions, some of which are sub-optimal.



Denna post skapades 2011-12-29. Senast ändrad 2017-03-21.
CPL Pubid: 151161

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling (2010-2017)
Institutionen för signaler och system, Antenner (2005-2014)

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur