Robust astronomical imaging in the presence of radio frequency interference

Shuimei Zhang, Yujie Gu, Yimin D. Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Radio astronomical observations are increasingly contaminated by radio frequency interference (RFI), rendering the development of effective RFI suppression techniques a pressing task. In practice, the existence of model mismatch makes the observing environment more challenging. In this paper, we develop a robust astronomical imaging method in the presence of RFI and model mismatch. The key contribution of the proposed method is the accurate estimation of the actual signal steering vector by maximizing the beamformer output power subject to a constraint that prevents the estimated steering vector from converging to the interference steering vectors. The proposed method is formulated as a quadratically constrained quadratic programming problem that can be solved using efficient numerical approaches. Simulation results demonstrate the effectiveness of the proposed method.

Original languageEnglish
Article number1940012
JournalJournal of Astronomical Instrumentation
Volume8
Issue number1
DOIs
StatePublished - 1 Mar 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 World Scientific Publishing Company.

Funding

This work is supported in part by the National Science Foundation (NSF) under Grant AST-1547420.

FundersFunder number
National Science FoundationAST-1547420

    Keywords

    • Robust adaptive beamforming
    • astronomical imaging
    • radio interference
    • synthetic aperture

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