频率分集阵列雷达波束的相位方向图特性

研究了频率分集阵列雷达波束的相位方向图特性.由于在各阵元之间引入频率增量,FDA雷达发射方向图,即幅度方向图具有角度-距离的二维依赖性,空间波束指向会随距离变化而发生变化,产生弯曲现象,然而FDA雷达的相位方向图却不具有该特性.本文提出了FDA模型建立法和欧拉公式法并建立了FDA相位分布模型;仿真分析建立的两种模型,比较得出欧拉公式法误差较小,因而选取其作为研究FDA相位方向图特性的模型;基于该模型,建立了FDA相位方向图,并仿真分析了等高线、等角线、等距线上的相位分布特性,确定了FDA波束的同相波前分布.理论分析与仿真结果表明,FDA波束的相位分布与相控阵相比并没有产生弯曲现象,且分布特性与相控阵基本一致.

Phase Pattern Characteristics of Frequency Diversity Array Radar Beam

In this paper,the phase pattern characteristics of the frequency diversity array(FDA)radar beam were studied.Since the frequency increment was introduced between the array elements,the FDA radar transmitting beam pattern showed two-dimension dependence on the angle and distance,the spatial beam direction changed with the distance,producing the phenomenon of bending,however,the phase pattern of the FDA radar did not show this characteristic.In this paper,two modeling methods,the phase distribution algorithm of FDA beam and Euler''s formula,were proposed to establish the FDA beam phase distribution model firstly.Simulating and analyzing the two modeling methods,the Euler''s formula was confirmed to be fit for studying the phase distribution of the FDA beam.Based on the optimal model,the phase distribution characteristics of the contour line,equiangular line and isometry line were simulated and analyzed,and thus,the in-phase wavefront of FDA beam were determined.The theoretical analysis and simulation results show that the phase distribution of the FDA beam does not produce the bending phenomenon compared with the phased array,and the distribution characteristic is basically the same as the phased array.