论文部分内容阅读
为使未来的雷达工作于敌对环境时能状得足够好的系统性能,要求大型阵列天线能在波瓣图中自适应地形成清晰的零值。文献中介绍的大多数方法只适用于小型阵列,当推广到大型阵列时就变得不适用了。本文讨论的几种零点指向控制技术,可用于大型阵列天线,且不致过多地增加系统的复杂性或费用。所介绍的一种双波束波导结构,在频扫系统中为有效地实现低旁瓣单脉冲天线,特别有吸引力。介绍的另一种方法,其零点指向可通过仅对相控阵天线中激励单元的相位加以调整便可得到。最后,讨论了一种多波束透镜馈电天线系统,它提供了宽带、低旁瓣性能,且能在任意方向上产生清晰的零点。
In order for the future radar to work well enough in hostile environments, large array antennas are required to adaptively form clear zeroes in the lobe map. Most of the methods described in the literature apply only to small arrays, which become unsuitable when applied to large arrays. This article discusses several zero-point control techniques that can be used with large array antennas without adding too much complexity or expense to the system. The dual-beam waveguide structure presented is particularly attractive for efficient low-side-shot single-pulse antennas in frequency-swept systems. Another way of introducing the zero point pointing can be achieved by adjusting the phase of the excitation unit in the phased-array antenna only. Finally, a multibeam lens feed antenna system is discussed that provides wideband, low sidelobe performance and produces a clear zero point in either direction.