RFI mitigation with phase-only adaptive beamforming
Abstract
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.
Cite
@article{arxiv.1011.1816,
title = {RFI mitigation with phase-only adaptive beamforming},
author = {P. A. Fridman},
journal= {arXiv preprint arXiv:1011.1816},
year = {2010}
}
Comments
7 pages, 11 figures