Introduction to Interference Mitigation Techniques in Radio Astronomy
Amir Leshem, A. van Veen · 2000
Radio-astronomical observations are increasingly corrupted by RF interference. 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. Finally, we discuss modifications necessary in the deconvolution step after spatial filtering, and propose a simple algebraic solution for self-calibration.