海面反射引起的多径干涉效应,会造成宽波束雷达天线的俯仰波束分裂,导致雷达观测的盲区和目标跟踪丢失。文 中从天线和电波传播的观点出发,分析了海面上单脉冲二次雷达询问天线的三维方向图特性,阐述了天线波束干涉的原 理。详细分析海基一维相控阵雷达天线在姿态倾斜后的方位面和俯仰面干涉方向图,讨论了由于方向图变化引起的系统 测角偏差,总结了降低多径影响的方法。

Multipath interference, caused by sea water reflection, will lead to elevation lobing of the radar, which antenna has wide beam, and observation blind space and tracking target losing. This paper focuses on antenna and electromagnetic wave propagation, analyzing the 3D pattern of the interrogation antenna of the monopulse secondary surveillance radar over sea water, and introducing the principle of the antenna beam interference. This paper also analyzes the interferential azimuth and elevation patterns of the slantwise sea-base linear phased array antenna, discusses the angle measurement errors caused by pattern deformation, and conclude some countermeasures to reduce the affection.