Improving the Calibration Efficiency of an Array Fed Reflector Antenna through Con-strained Beamforming
Journal article, 2013

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.

Author

A. Young

Stellenbosch University

Marianna Ivashina

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

Rob Maaskant

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

Oleg Iupikov

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

D. B. Davidson

Stellenbosch University

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 61 7 3538 - 3545 6490015

Areas of Advance

Information and Communication Technology

Infrastructure

Onsala Space Observatory

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TAP.2013.2255577

More information

Created

10/8/2017