基于伍德沃德-劳森抽样方法的阵列平顶波束综合  

Array Flat-top Beam Synthesis Based on Woodward-Lawson Sampling Method

作　　者：王安义[1] 黄笑 徐艳红 WANG An-yi;HUANG Xiao;XU Yan-hong(College of Communication and Information Engineering,Xi an University of Science and Technology,Xi an 710054,China)

机构地区：[1]西安科技大学通信与信息工程学院,西安710054

出　　处：《科学技术与工程》2022年第31期13794-13800,共7页Science Technology and Engineering

基　　金：国家自然科学基金青年科学基金(61901357)。

摘　　要：为获得高增益和强方向性,阵列天线应运而生,波束赋形技术在降低阵列副瓣电平、扩大阵列角度覆盖范围、抑制干扰等方面具有重要意义。其中,具有平顶形状波束的天线可辐射具有相同增益的波束,实现宽角度覆盖,且伍德沃德-劳森抽样具有方法简单、抽样点少、运算速度快的优势。因此,运用伍德沃德-劳森抽样方法对均匀直线阵列进行平顶波束赋形。通过计算抽样点数和抽样点位置,得到激励系数,确定阵元位置,计算出激励电流,从而求得各单元的电流分布,计算出阵列的方向图函数,利用MATLAB编程绘制方向图,并分析其基本特性,同时用控制变量法分析不同参数变化对方向图基本特性的影响。研究结果表明:综合的线阵单元数越多,抽样点就越多,综合得到的方向图就越接近预期,综合后方向图主瓣范围内的波纹起伏越小,副瓣电平越低。此外,定向辐射的平顶波束赋形天线在点对多点的无线通信中发挥着重要作用,也可以应用在车载和机载防撞天线、自动驾驶和飞行器等安全控制中心的核心组件中,市场前景广阔。In order to obtain high gain and strong directivity,array antenna came into being.Beamforming technology is of great significance in reducing the sidelobe level of array,expanding the coverage range of array angle coating,and suppressing interference.Among them,the antenna with flat-top shaped beam can radiate the beam with the same gain to achieve wide angle coverage.Woodward-Lawson sampling has the advantages of simple method,less sampling points and fast operation speed.Therefore,Woodward-Lawson sampling method is used to form flat-top of uniform linear array.By calculating the number of sampling points and the position of sampling points,the excitation coefficient is obtained,the position of the array element is determined,and the excitation current is calculated,so as to obtain the current distribution of each element,and the pattern function of the array is calculated.The pattern is drawn by MATLAB programming,and its basic characteristics are analyzed.At the same time,the influence of different parameters on the basic characteristics of the pattern is analyzed by control variable method.The results show that the more synthesized linear array elements and the more sampling points it has,the closer the synthesized pattern is to the expectation,the smaller the ripples are in the main lobe range of the synthesized pattern and the lower the sidelobe level is.In addition,the directional radiation flat-top beamforming antenna plays an important role in point-to-multipoint wireless communication.It can also be applied to the core components of vehicle and airborne anti-collision antenna,autonomous driving and aircraft safety control centers.The market prospect is promising.

关 键 词：阵列天线 波束综合 平顶波束赋形 伍德沃德-劳森抽样方法 

分 类 号：TN820[电子电信—信息与通信工程]