High-Resolution Techniques in Signal Processing Antennas

Yasutaka OGAWA  Nobuyoshi KIKUMA  

IEICE TRANSACTIONS on Communications   Vol.E78-B   No.11   pp.1435-1442
Publication Date: 1995/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Adaptive Signal Processing Technology in Antennas)
null steering,  superresolution technique,  MUSIC algorithm,  Root MUSIC,  radar imaging,  

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Signal processing antennas have been studied not only for interference suppression but also for high-resolution estimation of radio environment such as directions-of-arrival of incident signals. These two applications are based on the common technique, that is, null steering. This tutorial paper reviews the MUSIC algorithm which is one of the typical high-resolution techniques. Examining the eigenvector beam patterns, we demonstrate that the high-resolution capability is realized by steering nulls. The considerations will be useful for understanding the high-resolution techniques in the signal processing antennas. We then describe a modified version of MUSIC (Root MUSIC). We show the performance and robustness of the method. Furthermore, we introduce radar target identification and two-dimensional radar target imaging. These study fields are new applications of the signal processing antennas, to which a great deal of attention has been devoted recently.