다기능 레이다의 디지털 능동 위상 배열 안테나에 최적화된 이중 채널 부엽 차단 빔 패턴 형성에 관한 연구

Abstract

To prevent the detection performance of radar systems from being degraded by interference signals appearing in the side-lobe of the antenna, an additional side-lobe blanking(SLB) antenna is often added and operated alongside the main antenna. In this paper, the SLB antenna composed of array elements within the main antenna is discussed. Using the structural features of the digital active phased array antenna implies that no additional antenna is physically added. Optical channels are also employed to simultaneously form multiple digital beams for the main and the SLB antennas. A structure for the SLB antenna to cover all the side-lobes of the main antenna pattern was designed using two SLB beam patterns, and weight distributions corresponding to each element were calculated. Applying the weight distributions of the designed SLB antenna, the far-field pattern was reviewed through near field tests. As a result and as shown in the simulation, it was confirmed that, even during beam steering, all the side-lobes of the main antenna were covered by the beam patterns of the dual-channel SLB antenna in all regions of the 2D space.