Performance Study of NVL Technique Based Robust Uniform Concentric Circular Array Beamformer under Mismatch Condition

The performance of Uniform Concentric Circular Array (UCCA) by adopting robust technique is analyzed in this paper. The inter-element spacing and the interring spacing this UCCA structure is kept uniformly as half wavelength. UCCA is chosen because of its circular structure and it has the ability to scan the desired signal from 0° to 360°. If there is any mismatch between actual signal and steering directions, the performance of Minimum Variance Distortion-less Response (MVDR) will degrade will degrade. Different loading techniques can resolve the problem for mismatch and make the system robust enough to receive the anticipated signal in the presence of inequality between actual and steering direction. A New Variable Loading (NVL) based UCCA beamformer is proposed in this work and compared the performance with existing loading technique-based UCCA beamformers. It is observed that the proposed UCCA beamformer exhibits better interference attenuation capability and offers better robustness against mismatch compared to the existing beamformers. The performance of proposed NVL based beamformer is analyzed using MATLAB software.