Abstract-A deterministic method for detecting faulty elements in phased arrays is proposed and tested against experimental and numerical data. The solution approach assumes as input the amplitude and phase of the near-field distributions and allows to determine both positions and currents of radiating elements. The corresponding non linear inverse problem is properly solved by exploiting the distributional approach, which allows to cast the initial problem to the solution of a linear one, whose solution is made stable by adopting a proper regularization scheme based on the Truncated Singular Value Decomposition tool. The results fully confirm accuracy of the proposed technique.
MOTIVATIONSMany applications, ranging from sonar, radar and space communications, need for fully active phased arrays [1][2][3]. These antennas have several hundreds of radiating elements or proper sub-arrays [2,3], and the possibility of their failure strongly increases. These element failures can cause sharp variations in the aperture field across the array aperture, thus increasing both the sidelobes and the ripple level of the far-field radiation pattern. In order to know which element or elements are damaged, active antennas can include calibration systems. TheseCorresponding author: M. D'Urso (mdurso@selex-si.com).
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