RFI mitigation with phase-only adaptive beamforming

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 fa...

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Bibliographic Details
Published in:arXiv.org 2010-11
Main Author: Fridman, P A
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Beamforming
Computer simulation
Evolutionary algorithms
Interferometers
Pulsars
Radio frequency
Radio frequency interference
Radio interferometers
Radio signals
Radio sources (astronomy)
Signal processing
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1011.1816