Near-field Mesh Space Focusing Method of Large-scale Broadband Array Radar

Abstract

When an array radar is used for detection of multiple fragment targets, the near-field beamforming should be required to distinguish the fragments by angle at different positions in the field of view because the radar is close to them. In this paper, based on the characteristics of the elements of the single-transmitting and multi-receiving array radar, the geometric configuration of an array composed of different sub-arrays was designed, the aperture transit time difference was reduced by dividing the elements in the array radar into sub-arrays, and then compensated and focused to form a spatial mesh beam to cover the targets. A complete nearfield spatial broadband beamforming algorithm was proposed, the implementation process of the algorithm was derived with the chirp signals, the effectiveness of the algorithm was verified by the simulation, and a 10°×10° wide field of view was realized under the radar receiving array conditions.