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main.m
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%{
* 基于二维阵的高频地波雷达电离层回波方向估计
* Description: my graduation projec
* Author: ZhicongSun from HITWH
* Email:[email protected]
* Github address: https://github.com/RadarSun
* Data: from 2020.03.05 to 2020.06.08
%}
%%
%%全局变量初始化
close all;
clear global;
clear all;
global g_para g_signal g_array g_axis_range;
global g_echos;
%静态参数
g_para.rad = pi/180; %常量
g_signal.freq = 4.7*10^6; %发射（接收）信号频率4.7Mhz
g_signal.lamda = (3*10^8)/g_signal.freq;%发射（接收）信号波长
%默认的可变参数
testmode = 'dbf';
g_array.num = 16; %天线阵元总个数
g_array.x_num = 8; %X方向阵元个数
g_array.y_num = 8; %Y方向阵元个数
g_array.span = g_signal.lamda/2; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
g_echos.theta.num = 45;
g_echos.phi.num = 45;
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = 1; %回波数
g_echos.snr = 10;
g_echos.snapshot = 1000; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=sqrt(10^(g_echos.snr/10))*exp(j*2*pi*g_signal.freq*g_echos.t); %构造有用信号
if((strcmp(testmode,'array_num')==0)&(strcmp(testmode,'array_span')==0))
plotarray();
end
switch testmode
case 'array_num'
%测试阵元数目对方向图的影响
g_array.num = 8; %天线阵元总个数
g_array.x_num = 4; %X方向阵元个数
g_array.y_num = 4; %Y方向阵元个数
g_array.span = g_signal.lamda/2; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
g_array.num = 16; %天线阵元总个数
g_array.x_num = 8; %X方向阵元个数
g_array.y_num = 8; %Y方向阵元个数
g_array.span = g_signal.lamda/2; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
g_array.num = 32; %天线阵元总个数
g_array.x_num = 16; %X方向阵元个数
g_array.y_num = 16; %Y方向阵元个数
g_array.span = g_signal.lamda/2; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
case 'array_span'
%测试阵元间距对方向图的影响
g_array.span = g_signal.lamda/4; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
g_array.span = g_signal.lamda/2; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
g_array.span = g_signal.lamda/2*3; %阵元间距
g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
beamforming('normal');
case 'snapshot_num'
case 'doa'
%测试超分辨DOA估计算法
% g_array.num = 32; %天线阵元总个数
% g_array.x_num = 16; %X方向阵元个数
% g_array.y_num = 16; %Y方向阵元个数
% g_array.span = g_signal.lamda/2; %阵元间距
% g_array.x_pos = g_array.span : g_array.span : (g_array.x_num)*g_array.span;
% g_array.y_pos = 0 : g_array.span : (g_array.y_num-1)*g_array.span;
%
% g_echos.snr = 100;
% g_echos.theta.num = [10 40 70] ;
% g_echos.phi.num = [65 20 40];
% g_echos.num = length(g_echos.theta.num);
% g_echos.theta.rad = g_echos.theta.num*g_para.rad;
% g_echos.phi.rad = g_echos.phi.num*g_para.rad;
% g_echos.signal = rand(g_echos.num,g_echos.snapshot);
% doa('esprit2d');
% g_echos.theta.num = [15 35 45 60 75 -15 -30 -50 -75] ;
% g_echos.phi.num = [70 60 45 35 15 -15 -30 -50 -75];
% g_echos.theta.num = [15 25 35 45 55 65 75 ] ;
% g_echos.phi.num = [85 75 65 55 45 35 25 ];
% g_echos.theta.num = [15 25 35 ] ;
% g_echos.phi.num = [85 75 65 ];
g_echos.theta.num = [15 15 34 34 60 60 70 70];
g_echos.phi.num = [70 50 60 20 35 50 15 70];
g_echos.num = length(g_echos.theta.num);
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.signal = rand(g_echos.num,g_echos.snapshot);
doa();
case 'dbf'
%测试波束扫描测角算法
dbf_mode = 'capon';%多种波束扫描测角算法，用dbf_mode值为标志
switch dbf_mode
case 'normal_and_capon'
%对比二维普通波束形成和二维capon
%%可分辨
g_echos.theta.num = [34,60];
g_echos.phi.num = [60,35];
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
beamforming('capon');
%%不可分辨
g_echos.theta.num = [34,50];
g_echos.phi.num = [40,34];
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
beamforming('capon');
% %%可分辨
% g_echos.theta.num = [34,60];
% g_echos.phi.num = [60,35];
% g_echos.theta.rad = g_echos.theta.num*g_para.rad;
% g_echos.phi.rad = g_echos.phi.num*g_para.rad;
% g_echos.num = length(g_echos.theta.num);
% g_echos.snr = 10;
% g_echos.snapshot = 100; %节拍数
% g_echos.t = [0:99]/1000;
% g_echos.signal=rand(g_echos.num,g_echos.snapshot);
% beamforming('normal');
% beamforming('capon');
% %%不可分辨
% g_echos.theta.num = [34,50];
% g_echos.phi.num = [40,34];
% g_echos.theta.rad = g_echos.theta.num*g_para.rad;
% g_echos.phi.rad = g_echos.phi.num*g_para.rad;
% g_echos.num = length(g_echos.theta.num);
% g_echos.snr = 10;
% g_echos.snapshot = 100; %节拍数
% g_echos.t = [0:99]/1000;
% g_echos.signal=rand(g_echos.num,g_echos.snapshot);
% beamforming('normal');
% beamforming('capon');
case 'capon'
%测试二维capon
% g_echos.theta.num = [15 34,60 70 -70 -55 -35 -15 -15 -30 -40 -60];
% g_echos.phi.num = [70 60 35 15 -10 -30 -50 -65 -45 15 35 60];
% g_echos.theta.num = [15 15 15 15 20 20 20 20 ];
% g_echos.phi.num = [70 60 35 15 70 60 35 15 ];
g_echos.theta.num = [15 15 15 15 15 15 15 15];
g_echos.phi.num = [65 55 45 45 35 25 15 5];
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('capon');
case 'normal'
%测普通数字波束形成
g_echos.theta.num = 45;
g_echos.phi.num = 50;
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
case 'normal_theta_and_direction'
%测指向方向对普通波束形成波束宽度的影响
g_echos.theta.num = 40;
g_echos.phi.num = 60;
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
g_echos.theta.num = 10;
g_echos.phi.num = 60;
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
g_echos.theta.num = 60;
g_echos.phi.num = 10;
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
case 'normal_resolution'
%测普通波束形成分辨率问题
g_echos.theta.num = [40,55];
g_echos.phi.num = [55,40];
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
g_echos.theta.num = [40,60];
g_echos.phi.num = [40,40];
g_echos.theta.rad = g_echos.theta.num*g_para.rad;
g_echos.phi.rad = g_echos.phi.num*g_para.rad;
g_echos.num = length(g_echos.theta.num);
g_echos.snr = 10;
g_echos.snapshot = 100; %节拍数
g_echos.t = [0:99]/1000;
g_echos.signal=rand(g_echos.num,g_echos.snapshot);
beamforming('normal');
otherwise
disp('Please input dbf mode!');
end
otherwise
disp('Please input global mode!');
end
function plotarray()
%{
Function description:
画8x8阵列图，参数都是固定的
Syntax：
Log description：
2020.03.17 建立函数
%}
global g_array g_axis_range;
g_axis_range.x = [g_array.span 2*g_array.span 3*g_array.span 4*g_array.span ... %阵元位置信息 8x8共16个阵元
5*g_array.span 6*g_array.span 7*g_array.span 8*g_array.span 0 0 0 0 0 0 0 0];
g_axis_range.y = [0 0 0 0 0 0 0 0 0 g_array.span 2*g_array.span 3*g_array.span ...
4*g_array.span 5*g_array.span 6*g_array.span 7*g_array.span];
g_axis_range.z = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];
figure('Name','L阵示意图','NumberTitle','off','Color','white','Position',[200 200 400 400]);
scatter3(g_axis_range.x, g_axis_range.y, g_axis_range.z);
axis([0, 9*g_array.span, 0, 9*g_array.span, 0, 9*g_array.span]);
title("L阵接收阵列示意图");
xlabel('X/m');
ylabel('Y/m：海岸线');
zlabel('Z');
end