密度锥削阵FDA雷达方向图特性分析

频率分集阵列（Frequency Diverse Array, FDA）雷达其波束具有时间 距离-角度三维相关性，使其在主瓣干扰抑制、欺骗干扰、真假目标识别等领域有着传统相控阵雷达无法比拟的优势。阵列结构和非线性频控函数设计是实现FDA辐射能量空间聚焦的主要方式。考虑到现有基于一维线阵的研究文献中较少有关于不等间距阵列的特性分析，本文将密度锥削阵与FDA结构相结合，仿真验证了密度锥削阵FDA与相控阵（Phased Array, PA）、一维均匀线性FDA（Uniform Linear Array FDA, ULFDA）、对数FDA（log-FDA）相比的阵列性能优势。同时，仿真分析了密度锥削阵FDA间距递增因子、非线性频控函数设计对其阵列方向图的性能影响。

Analysis of Beam Pattern Characteristics of FDA Radar Based on Density Tapered Array

Frequency diverse array (FDA) radar has advantages over traditional phased array in the mainlobe interference suppression, deception jamming, true and false target recognition and other fields because of the time-range-angle relation of its beam pattern. Array design and nonlinear frequency offset design are the main ways to realize energy focused radiation of the FDA beam pattern. Considering that there is little analysis on the characteristics of unequally spaced array in the existing literatures based on one-dimensional linear array, this paper combines the density tapered array with FDA, and verifies the performance advantages of density tapered array FDA compared with phased array (PA), uniform linear array FDA (ULFDA) and FDA using logarithmical frequency offset (log-FDA). The influence of FDA spacing increasing factor and nonlinear frequency offset design on the array beam pattern performance is also analyzed.