Spatial filtering of RF interference in radio astronomy

被引:61
作者
Raza, J [1 ]
Boonstra, AJ
van der Veen, AJ
机构
[1] Delft Univ Technol, Dept Elect Engn, NL-2628 CD Delft, Netherlands
[2] Netherlands Fdn Res Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands
关键词
antenna arrays; array signal processing; interference suppression; interferometry; radio astronomy; spatial filtering;
D O I
10.1109/97.991140
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:64 / 67
页数:4
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