Multichannel interference mitigation methods in radio astronomy

Abstract

Radio-astronomical observations are increasingly corrupted by RF interference, and online detection and filtering algorithms are becoming essential. To facilitate the introduction of such techniques into radio astronomy, we formulate the astronomical problem in an array signal processing language, and give an introduction to some elementary algorithms from that field. We consider two topics in detail: interference detection by rank estimation of short-term covariance matrices, and spatial filtering by subspace estimation and projection. We discuss experimental data collected at the Westerbork radio telescope, and illustrate the effectiveness of the space-time detection and blanking process on the recovery of a 3C48 absorption line in the presence of GSM mobile telephony interference.

39 pages, 18 figures.Enhanced figures can be downloaded from http://cas.et.tudelft.nl/~leshem/postscripts/leshem/figs34567.ps.gz To appear in Astrophysical Journal Supplements series

References in corpus (1)

• Radio astronomical imaging in the presence of strong radio interference

Cited by in corpus (22)

• A morphological algorithm for improving radio-frequency interference detection
• Post-correlation radio frequency interference classification methods
• VAST: An ASKAP Survey for Variables and Slow Transients
• Radio astronomical imaging in the presence of strong radio interference
• The LOFAR radio environment
• Image formation in synthetic aperture radio telescopes
• Calibration Challenges for Future Radio Telescopes
• Phased Array Feed Calibration, Beamforming and Imaging
• IQRM: real-time adaptive RFI masking for radio transient and pulsar searches
• Post-correlation filtering techniques for off-axis source and RFI removal
• Implementing RFI mitigation in Radio Science
• A new approach to mitigation of radio frequency interference in interferometric data
• Parametric high resolution techniques for radio astronomical imaging
• The brightness and spatial distributions of terrestrial radio sources
• The Application of Autocorrelation SETI Search Techniques in an ATA Survey
• Interstellar Communication: The Case for Spread Spectrum
• Radio Astronomical Image Formation using Constrained Least Squares and Krylov Subspaces
• Comparison of RFI Mitigation Strategies for Dispersed Pulse Detection
• Categorize Radio Interference using component and temporal analysis
• Near-field imaging of local interference in radio interferometric data: Impact on the redshifted 21 cm power spectrum
• Radio Frequency Interference Mitigation for Detection of Extended Sources with an Interferometer
• Operational Non-identifiability of Single-epoch Low-rank RFI Mitigation: Controlled Failure-mode Analysis and HERA Evidence