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Interference Mitigation Using a Focal Plane Array
| Citations: | 9 - 7 self |
BibTeX
@MISC{Hansen_interferencemitigation,
author = {Chad K. Hansen and Karl F. Warnick and Brian D. Jeffs and J. Richard Fisher and Richard Bradley},
title = { Interference Mitigation Using a Focal Plane Array},
year = {}
}
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Abstract
We consider the use of spatial filtering algorithms for radio frequency interference (RFI) mitigation in conjunction with a focal plane feed array of electrically small elements. Numerical simulations are used to study the performance of 7 and 19 element hexagonal dipole arrays with a 25 meter reflector at an operating frequency of 1612 MHz. Using the maximum-SNR algorithm to generate array weights, an interfering signal was attenuated by 40 dB or more. The effective sensitivity of the system, including interferer power in the system noise temperature, was comparable to the sensitivity attained in the absence of RFI. Moving the interferer through the reflector pattern sidelobes caused fluctuations in the gain and system sensitivity. This effect was exacerbated by a reflector model with random surface distortions. These results indicate that array feeds are a promising approach for RFI migitation, but achieving stable radiation patterns in the presence of an interferer may require a tradeoff between pattern control and maximum attainable sensitivity.
Keyphrases
radio science focal plane array interference mitigation stable radiation pattern spatial filtering algorithm system sensitivity rfi migitation small element random surface distortion effective sensitivity operating frequency reflector pattern sidelobes system noise temperature pattern control element hexagonal dipole array meter reflector focal plane reflector model array feed array weight maximum-snr algorithm numerical simulation maximum attainable sensitivity interfering signal promising approach interferer power radio frequency interference
