RFI mitigation with phase-only adaptive beamforming

Details RFI mitigation with phase-only adaptive beamforming RFI mitigation with phase-only adaptive beamforming

2010-11-08

arxiv.org/abs/1011.1816v1

Radio Science, vol.40, RS5S08, 2005

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

7 pages, 11 figures

Scientific paper

10.1029/2004RS003142

Connected radio interferometers are sometimes used in the tied-array mode: signals from antenna elements are coherently added and the sum signal applied to a VLBI backend or pulsar processing machine. Usually there is no computer-controlled amplitude weighting in the existing radio interferometer facilities. Radio frequency interference (RFI) mitigation with phase-only adaptive beamforming is proposed for this mode of observation. Small phase perturbations are introduced in each of the antenna's signal. The values of these perturbations are optimized in such a way that the signal from a radio source of interest is preserved and RFI signals suppressed. An evolutionary programming algorithm is used for this task. Computer simulations, made for both one-dimensional and two-dimensional array set-ups, show considerable suppression of RFI and acceptable changes to the main array beam in the radio source direction.

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