Failure diagnosis for time-modulated arrays based on compressed sensing

Guo Bai, Cheng Liao, You-Feng Cheng, Yuanzhi Liu, Ju Feng and Xuanming Zhong

Journal of Electromagnetic Waves and Applications, 2024, vol. 38, issue 1, 17-33

Abstract: Time-modulated arrays (TMAs) have a high design degrees of freedom (DoFs) to improve radiation performance, while they are prone to failure due to their hardware characteristics. In this article, we propose a novel technique to diagnose impaired TMAs based on compressed sensing (CS). The TMA diagnosis problem is reformulated as a sparse signal recovery problem at the center frequency and sidebands. Then, a method based on the difference of convex sets theory and sequential convex programming (DCS-SCP) is developed to implement diagnosis for impaired TMAs. Using a small number of far-field measurements at the same position but different frequencies, the joint recovery of the equivalent excitations at the center frequency and sidebands is realized by a mixed $ l_{0} $ l0/ $ l_{2} $ l2-norm minimization method. The numerical simulation and the successful comparison with the state-of-the-art algorithms demonstrate the superiority of the proposed methods in terms of noise robustness and diagnosis accuracy.

Date: 2024
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DOI: 10.1080/09205071.2023.2270517

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