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

Performance of Polarimetric Beamformers for Phased Array Radio Telescopes