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Spatial filtering of RF interference in radio astronomy

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3 Author(s)
Raza, J. ; Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands ; Boonstra, A.-J. ; van der Veen, A.-J.

We investigate spatial filtering techniques for interference removal in multichannel radio astronomical observations. The techniques are based on the estimation of the spatial signature vector of the interferer from short-term spatial covariance matrices followed by a subspace projection to remove that dimension from the covariance matrix, and by further averaging. The projections will also modify the astronomical data, and hence a correction has to be applied to the long-term average to compensate for this. As shown by experimental results, the proposed technique leads to significantly improved estimates of the interference-free covariance matrix.

Published in:

Signal Processing Letters, IEEE  (Volume:9 ,  Issue: 2 )