Subarray configurations for digital beamforming with low sidelobes and adaptive interference suppression

Abstract

The paper investigates how subarrays in a large phased array should be arranged. The aim is to form sum and difference beams with low sidelobes with and without adaptation against external interference. At each array element phase shifting and amplitude tapering for one beam with low sidelobes is assumed. The other beams (e.g. difference beams) have to be formed digitally at the subarray outputs. Problems with grating lobes are considered.