V. A. Obukhovets1
1 Southern Federal University (Rostov-on-Don, Russia)

In adaptive antenna arrays, when exposed to external interferences, it is necessary to adjust the radiation pattern in such a way as to form deep nulls in the directions of interference. The paper discusses an algorithm for calculating signal processing optimal weights that maximize the signal-to-noise ratio under the influence of concentrated interferences. The procedure boils down to the formation of controlled “nulls” in the radiation pattern of the phased array antenna. In most of the known papers, when the electromagnetic environment changes, the solution methods require to determine a new set of complex weights for all elements of the antenna array, which needs significant computational efforts.

The purpose of the paper is to produce the algorithm with lower numbers of calculation operations. Such algorithm is based on the procedure of the initial radiation pattern shape correction, which provides suppression of concentrated interferences signals. The algorithm is distinguished by a reduced dimensionality of the problem and the associated reduced amount of computational costs and, accordingly, higher performance. This is made possible by applying a procedure for correcting the initial radiation pattern instead of completely solving the synthesis problem every time when interference situation changes. To solve the problem, a variational method has been used, based on the search for the extremum of the functional, which takes into account the requirement to maximize the value of the signal-to-noise ratio when imposing restrictions on the level of the radiation pattern in the direction of interference. Calculation procedure allows you to consider the polarization of signals and the directional properties of the radiators, as well as their mutual coupling. The algorithm has been tested on examples of ring and flat rectangular antenna arrays simulation.

Obukhovets V.A. Controlled nulls forming in the radiation pattern of the receiving antenna array. Antennas. 2023. № 5. P. 38–45. DOI: https://doi.org/10.18127/j03209601-202305-04 (in Russian)

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