Null Steering in Failed Antenna Arrays. (14th June 2011)

• Record Type: Journal Article
• Authors: Acharya, Om Prakash; Patnaik, Amalendu; Sinha, Sachendra N.
• Other Names: Yang Miin-Shen Academic Editor.
• Is Part Of: Applied computational intelligence and soft computing. Volume 2011(2011)
• Publication Date: 2011-06-14
• Subjects: Computational intelligence -- Periodicals; Soft computing -- Periodicals; 006.305
• DOI: 10.1155/2011/692197
• Languages: English
• ISSNs: 1687-9724

Abstract

Abstract : Antenna array pattern nulling is desirable in order to suppress the interfering signals. But in large antenna arrays, there is always a possibility of failure of some elements, which may degrade the radiation pattern with an increase in side lobe level (SLL) and removal of the nulls from desired position. In this paper a correction procedure is introduced based on Particle Swarm Optimization (PSO) which maintains the nulling performance of the failed antenna array. Considering the faulty elements as nonradiating elements, PSO reoptimizes the weights of the remaining radiating elements to reshape the pattern. Simulation results for a Chebyshev array with imposed single, multiple, and broad nulls with failed antenna array are presented.