基于非线性增长频偏的频率分集阵列雷达波束仿真与分析

频率分集阵列(frequency diverse array,FDA)雷达具有距离与角度相耦合的波束特性,在与距离相关的干扰抑制或与距离相关的目标定位等一些运用上会受限。为消除这种耦合特性,出于实用性一般采用均匀线性阵列与非线性增长频偏。研究并比较了几种典型的非线性增长频偏形式,对这几种非线性增长频偏形式下的FDA雷达波束特性进行仿真,并分析比较各种频偏形式下FDA雷达关于距离和角度的波束宽度以及副瓣情况。研究表明,需结合实际运用需求和各种频偏形式的特点确定FDA雷达的最优频偏形式,以实现最佳波束运用效用。

Simulation and Analysis of Frequency Diverse Array Radar Beampattern Based on Non-linearly Increasing Frequency Offset

Beampattern of frequency diverse array(FDA)radar is range-angle coupled. Therefore, its application in some area such as suppress range dependent interferences and locate range dependent targets is limited. In consideration of practicability,uniform linear arrays and non-linearly increasing frequency offsets are adopted to decouple the range-angle beampattern. In this paper,several typical forms of non-linearly increasing frequency offset were compared and researched. And simulation of the FDA radar beampattern of these forms was carried out. Analysis and comparison of the range beam width,angle beam width and side lobe level of the FDA radar beampattern of these forms were done. The results show that the frequency offset form of FDA radar must be selected appropriately according to the characteristics of all frequency offset forms and actual demands in order to get best application effect.