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A Duvall Beamformer with Spatial Interpolation to Solve Coherent Interferences Problem  

Yun, Dong-Hyeon (School of Electronic & Electrical Engineering, Kyungpook National University)
Han, Dong-Seok (School of Electronic & Electrical Engineering, Kyungpook National University)
Go, Gwang-Sik (School of Electronic & Electrical Engineering, Kyungpook National University)
Jo, Myeong-Je (Agency for Defense Development)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.1, 2002 , pp. 77-86 More about this Journal
Abstract
This paper proposes a modified Duvall beamformer performing spatial smoothing with spatial interpolation. In the proposed beamformer, virtual array signals are generated by spatial interpolation between each neighbor array elements, then all signals are used to perform spatial smoothing. The proposed beamformer overcomes the loss of degrees of freedom caused by spatial smoothing by forming subarrays with interpolated signals. Mathematical description shows that the proposed beamformer can restore the rank of away covariance matrix. Accordingly, the proposed beamformer can minimize the loss of degrees of freedom. Simulation results show that the proposed beamformer can remove all coherent interferences while conventional beamformers cannot.
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