Algorithm for beam grid forming in digital antenna arrays with an asymmetric envelope of side lobes

Abstract

In digital antenna arrays with a parallel view of space, the linear phasing method is usually used to distribute beams in space. At the same time, the requirements for the side lobe level are sufficiently fulfilled if the amplitude distribution falling to the edges of the opening is used. In this case, the envelope of the side lobes does not take into account the distribution of noise temperature in space. For different orientation of the beams in space, the noise quality of the antenna depends on the spatial orientation of the formed beams. In this regard, the problem of forming a beam grid taking into account the spatial distribution of the noise temperature is of interest. The aim of the article is to increase the noise quality of the antenna in conditions of uneven distribution of noise temperature in space. The algorithm for forming a beam grid with a uniform angular pitch and a constant directivity has been proposed, taking into account the uneven distribution of noise temperature in space based on previously developed methods for the synthesis of antenna arrays: with a simplified gradient procedure and according to the requirements for the envelope of the side lobes. The proposed algorithm makes it possible in the considered example to achieve a gain in noise quality by 1.5 dB.