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Improving the Calibration Efficiency of an Array Fed Reflector Antenna through Con-strained Beamforming

A. Young ; Marianna Ivashina (Institutionen för signaler och system, Antenner) ; Rob Maaskant (Institutionen för signaler och system, Antenner) ; Oleg Iupikov (Institutionen för signaler och system, Antenner) ; D.B. Davidson
IEEE Transactions on Antennas and Propagation (0018-926X). Vol. 61 (2013), 7, p. 3538 - 3545.
[Artikel, refereegranskad vetenskaplig]

Calibrating for the radiation pattern of a multi-beam Phased array feed (PAF) based radio telescope largely depends on the accuracy of the pattern model, and the availability of suitable reference sources to solve for the unknown parameters in the pattern model. It is shown how the efficiency of this pattern calibration for PAF antennas can be improved by conforming the beamformed far field patterns to a two-parameter physics-based analytic reference model through the use of a linearly constrained minimum variance (LCMV) beamformer. Through this approach, which requires only a few calibration measurements, an accurate and simple pattern model is obtained. The effects of the model parameters on the directivity and sidelobe levels of multiple scanned beams are investigated, and these results are used in an example PAF beamformer design for the proposed MeerKAT antenna. Compared to a typically used maximum directivity (MaxDir) beamformer, the proposed constrained beamforming method is able to produce beam patterns over a wide Field-of-View (FoV) that are modeled with a higher degree of accuracy and result in a significant reduction in pattern calibration complexity.



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Denna post skapades 2014-09-18. Senast ändrad 2017-06-28.
CPL Pubid: 202944

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Antenner (2005-2014)

Ämnesområden

Informations- och kommunikationsteknik
Elektroteknik och elektronik

Chalmers infrastruktur

Onsala rymdobservatorium

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