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main.m
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clear all;close all;clc;
addpath algorithm
GHz = 1e9;
MHz = 1e6;
us = 1e-6;
%% 雷达参数（使用mmWave Studio默认参数）
c=3.0e8;
B=4000*1e6; %调频带宽
K = 58*1e12; %调频斜率
T=B/K; %采样时间
Tc=65e-6; %chirp总周期
fs=5.5*1e6; %采样率
f0=77e9; %初始频率
lambda=c/f0; %雷达信号波长
d=lambda/2; %天线阵列间距
n_samples=256; %采样点数/脉冲
N=256; %距离向FFT点数
n_chirps=64; %每帧脉冲数
M=512; %多普勒向FFT点数
n_RX=4; %RX天线通道数
n_TX=3; %TX天线通道数
Q = 512; %角度FFT
tx = 3; %发射天线数目
rx = 4; %接受天线数目
fnumber = 256;
PRI = 4e-3;
range_axis = linspace(0, fs * c / 2 / K, N);
velo_axis = linspace(-lambda / 4 / Tc, lambda / 4 / Tc, M);
an_axis_az = linspace(-asin(lambda/2/d), asin(lambda/2/d), Q);
an_axis_el = linspace(-asin(lambda/2/d), asin(lambda/2/d), Q);
fname = "2023-05-25-15-34-03.bin";
xxx = [];
yyy = [];
% 探测结果
confirm_detect = [];
temp_detect = [];
fid = fopen(fname,'rb');
sdata = fread(fid,'int16');
for xx = 1:fnumber-1
%16bits，复数形式(I/Q两路)，4RX,3TX,有符号16bit，小端模式
sdata2 = sdata((xx-1)*n_samples*n_chirps*rx*tx*2+1:xx*n_samples*n_chirps*rx*tx*2);
%% 1843+DCA1000
% 阵列排布
% rx1 rx2 rx3 rx4
% =======> 方位向
% tx1 ： [] [] [] [] ||
% tx2 ： [] [] [] [] ||
% tx3 ： [] [] [] [] ||
% 俯仰向 \/
fileSize = size(sdata2, 1);
lvds_data = zeros(1, fileSize/2);
count = 1;
for i=1:4:fileSize-5
lvds_data(1,count) =1i* sdata2(i) + sdata2(i+2);
lvds_data(1,count+1) =1i* sdata2(i+1)+sdata2(i+3);
count = count + 2;
end
lvds_data = reshape(lvds_data, tx*n_samples*n_RX, n_chirps);
t_lvds_data = [];
for tr = 1:tx * rx
t_lvds_data(tr, :, :) = lvds_data((tr - 1) * n_samples+1:tr * n_samples, :);
end
tx_data = [];
tx_select_rx = 1;
rx_select_tx = 1;
data_tx = [];
for ttxx = 1:tx
if ttxx == rx_select_tx
data_radar_1 = squeeze(t_lvds_data(rx_select_tx * rx - 3, :, :)); %RX1
data_radar_2 = squeeze(t_lvds_data(rx_select_tx * rx - 2, :, :)); %RX2
data_radar_3 = squeeze(t_lvds_data(rx_select_tx * rx - 1, :, :)); %RX3
data_radar_4 = squeeze(t_lvds_data(rx_select_tx * rx, :, :)); %RX4
end
temp_data = squeeze(t_lvds_data(ttxx * rx - 3, :, :)); % 采用RX1
data_tx(:, :, ttxx) = temp_data(:,1:end-8) - temp_data(:,9:end);
end
data_radar_1 = data_radar_1(:,1:end-8) - data_radar_1(:,9:end);
data_radar_2 = data_radar_2(:,1:end-8) - data_radar_2(:,9:end);
data_radar_3 = data_radar_3(:,1:end-8) - data_radar_3(:,9:end);
data_radar_4 = data_radar_4(:,1:end-8) - data_radar_4(:,9:end);
data_radar=[];
data_radar(:,:,1)=data_radar_1; %三维雷达回波数据
data_radar(:,:,2)=data_radar_2;
data_radar(:,:,3)=data_radar_3;
data_radar(:,:,4)=data_radar_4;
%% 3维FFT处理
%距离FFT
range_win = hamming(n_samples); %加海明窗
doppler_win = hamming(n_chirps);
range_profile = [];
for k=1:n_RX
range_profile(:,:,k) = fft(data_radar(:,:,k), N);
end
range_profile_tx = [];
for k=1:tx
range_profile_tx(:,:,k) = fft(data_tx(:,:,k), N);
end
%多普勒FFT
speed_profile = [];
for k=1:n_RX
speed_profile(:,:,k) = fftshift(fft(range_profile(:,:,k), M, 2), 2);
end
rd_result = squeeze(sum(speed_profile, 3) / size(speed_profile, 3));
[detect_profile, detect_res] = CFAR(rd_result);
%% detect_res(:, 2) is range
az_rmap = fftshift(squeeze(sum(abs(fft(speed_profile, Q, 3)), 2)), 2); % 距离 x 角度维度
% el_rmap = squeeze(sum(abs(fft(speed_profile_tx, Q, 3)), 2));
angle_detect = AngleDetectSearchingAngle(az_rmap, detect_res);
% 请用 (detect_res(:, 2), detect_res(:, 1) + 9) 来标定 rd 谱图与检测 坐标轴
% detect_res(:, 1) 是 距离轴
if isempty(angle_detect)
xxxx = [];
yyyy = [];
else
angles = an_axis_az(angle_detect(:,2));
ranges = range_axis(angle_detect(:,1));
xxxx = ranges .* sin(angles);
yyyy = ranges .* cos(angles);
end
new_detect_res = zeros(length(xxxx), 3);
new_detect_res(:, 1) = xxxx;
new_detect_res(:, 2) = yyyy;
% 填充数据
[detect_res_, temp_detect_res] = PointTraceFilter(xx,...
new_detect_res, ...
confirm_detect, ...
temp_detect);
confirm_detect = detect_res_;
temp_detect = temp_detect_res;
if ~isempty(confirm_detect)
xxx = [xxx confirm_detect(:, 1).'];
yyy = [yyy confirm_detect(:, 2).'];
end
figure(10007)
range_profile1 = flip(fft(data_radar_1, N));
imagesc(linspace(1, 64), range_axis, abs(squeeze(range_profile(:,:,1))))
xlabel("Chirps")
ylabel("距离(m)")
title("距离像结果")
figure(10008)
speed_profile1 = fft(range_profile1, M, 2);
imagesc(velo_axis, range_axis, abs(speed_profile(:,:,1)))
xlabel("速度(m/s)")
ylabel("距离(m)")
title("RD谱图结果")
figure(10009)
imagesc(velo_axis, range_axis, abs(detect_profile))
xlabel("速度(m/s)")
ylabel("距离(m)")
title("CA-CFAR结果")
figure(10010)
imagesc(an_axis_az, range_axis, abs(az_rmap));
xlabel("度(°)")
ylabel("距离(m)")
title("方位向距离-角度谱图结果")
figure(10011)
scatter(xxx, yyy)
axis([-15 15 0 20])
xlabel("X轴 距离(m)")
ylabel("Y轴 距离(m)")
title("定位结果")
figure(10012)
mesh(abs(az_rmap));
xlabel("度(°)")
ylabel("距离(m)")
title("方位向距离-角度谱图结果")
end
fclose(fid);