基于场强叠加合成的相控阵天线方向图模型  

Pattern Model of Phased Array Antenna Based on Field Strengths Superposition

作　　者：张晓青[1,2] 贾豫东 周哲海 

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]光电测试技术北京市重点实验室,北京100085

出　　处：《探测与控制学报》2013年第6期36-41,共6页Journal of Detection & Control

基　　金：光电测试技术北京市重点实验室开放项目资助(GDKF2013002)

摘　　要：针对目前相控阵天线的方向图计算与仿真分析均采用单频等幅发射信号的情况,提出基于场强叠加合成的相控阵天线方向图模型。该模型对线性调频发射信号采用场强叠加合成的方法推导出远场方向图合成场强的复包络,并分析得出方向图的基本特征以及相位控制波束扫描的方向图。仿真试验表明:该模型可用来生成相控阵天线发射线性调频信号连续波的方向图,其主瓣窄、旁瓣低的特征与实际情况相符;在发射信号持续时间内,若信号幅值恒定,则方向图函数复包络的相位改变而模不变。其研究结果为相控阵天线发射线性调频信号的相位控制方案设计及误差分析提供了理论依据。Aiming at the situation that single frequency and constant amplitude signals are usually used to deduce,simulate and analyze radiation patterns of PAA （phased array antenna）,the mathematic model of PAA patterns based on emitting LFM Linear Frequency Modulation） signals is proposed.The model utilizes the method of field strengths superposition to deduce PAA patterns,expressing the property of far field patterns by complex envelopes of synthetic field strength.It also analyzes the basic pattern characteristics and beam scanning patterns of phase controlling.The MATLAB simulation results indicate that the LFM patterns of PAA generated by this model have narrow main lobe and low side lobe,which agree with actual situation.Under the condition that the LFM amplitudes are constant within the LFM signal duration,complex envelopes of PAA patterns have changing phases and constant amplitudes.The research results provide theoretical basis for phase control schematic design and error analysis of PAA emitting LFM.

关 键 词：相控阵天线 线性调频 方向图 场强叠加 仿真 

分 类 号：TN955[电子电信—信号与信息处理]