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关键参数设置

     假设波束指向角度为40度，权值所用频率为500MHz，方向矢量所用频率分别为450MHz，500MHz，600MHz。

源代码

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%              线阵(孔径效应)%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%clc;clear all;close all;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%               参数设置%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%c=3e8;                 % 光速fc=500e6;              % 权值所用频率f=[450e6 500e6 600e6]; % 方向矢量频率lamda=c/fc;            % 波长d=lamda/2;             % 阵元间距M=10;                  % 阵元个数theta0=40;             % 波束指向取值范围n = [0:1:M-1]';        % 列矢量theta=-90:1:90;        % 扫描角取值范围%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%               权值计算%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%W = exp(1j*2*pi*fc*n*d*sin(theta0*pi/180)/c);%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%           权值*方向矢量%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%for p=1:length(f)   for q=1:length(theta)    % 扫描角取值范围             V = exp(1j*2*pi*f(p)*n*d*sin(theta(q)*pi/180)/c);%接收信号 相对于原点接收到的归一化的信号         B(q) = W'*V;       % 阵元功率叠加    '表示共轭转置   .'表示转置   endF=abs(B);    % 取信号的实部Fmax=max(F); % 得到最大值F_dB=20*log10(F/Fmax);plot(theta,F_dB);hold on;grid on;endaxis([-91 90 -40 1]);legend('f=450MHz','f=500MHz','f=600MHz');

仿真结果

仿真结果分析

     从仿真结果可以看出，只有当权值所用频率和方向矢量所用频率相等时，波束指向才正确。

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