资源简介
产生OFDM Chirp波形,包括时域表示和频域表示,用于mimo雷达,且附有参考文献,里面有波形的时频域表示,以便进一步研究
代码片段和文件信息
% mimo sar ofdm chirp waveform diversity design with random matrix modulation
% Wen Qin Wang
clear all
clc
%% 波形参数 %%
deltaf = 50e6;%50Mhz
Tb = 1.0e-6; %1us
k = 50e12; %调频率
M = 8; %列,8个chip
N = 8; %行,8个subcarrier
Tp = 8*Tb; %脉冲时宽
B = 8*deltaf; %脉冲带宽 400e6
fs = 400e6;
n = round(Tp*fs);%采样点个数(信号点数)
t = linspace((Tp-0)/nTpn);
j = sqrt(-1);
f18 = 7*deltaf;
f26 = 5*deltaf;
f31 = 0*deltaf;
f43 = 2*deltaf;
f55 = 4*deltaf;
f64 = 3*deltaf;
f72 = 1*deltaf;
f87 = 6*deltaf;
%% 定义每个码片内信号的幅度 (截取码片对应的数据)
a = ones(1length(t));
% a1
for i = 1:length(t)/8
a1(i) = a(i);
end
for i = length(t)/8+1:length(t)
a1(i) = 0;
end
%a2
for i = 1:length(t)/8
a2(i) = 0;
end
for i = length(t)/8+1:2*length(t)/8
a2(i) = a(i);
end
for i = 2*length(t)/8+1:length(t)
a2(i) = 0;
end
%a3
for i = 1:2*length(t)/8
a3(i) = 0;
end
for i = 2*length(t)/8+1:3*length(t)/8
a3(i) = a(i);
end
for i = 3*length(t)/8+1:length(t)
a3(i) = 0;
end
%a4
for i = 1:3*length(t)/8
a4(i) = 0;
end
for i = 3*length(t)/8+1:4*length(t)/8
a4(i) = a(i);
end
for i = 4*length(t)/8+1:length(t)
a4(i) = 0;
end
%a5
for i = 1:4*length(t)/8
a5(i) = 0;
end
for i = 4*length(t)/8+1:5*length(t)/8
a5(i) = a(i);
end
for i = 5*length(t)/8+1:length(t)
a5(i) = 0;
end
%a6
for i = 1:5*length(t)/8
a6(i) = 0;
end
for i = 5*length(t)/8+1:6*length(t)/8
a6(i) = a(i);
end
for i = 6*length(t)/8+1:length(t)
a6(i) = 0;
end
%a7
for i = 1:6*length(t)/8
a7(i) = 0;
end
for i = 6*length(t)/8+1:7*length(t)/8
a7(i) = a(i);
end
for i = 7*length(t)/8+1:length(t)
a7(i) = 0;
end
%a8
for i = 1:7*length(t)/8
a8(i) = 0;
end
for i = 7*length(t)/8+1:8*length(t)/8
a8(i) = a(i);
end
%% 重新定义t1 t2 t3 t4 t5 t6 t7 t8 %%【正确】
t1 = t;t2 = t-Tb;t3 = t-2*Tb;t4 = t-3*Tb;t5 = t-4*Tb;t6 = t-5*Tb;t7 = t-6*Tb;t8 = t-7*Tb;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
phi18 = a1.*exp(j*2*pi*(f18*t1+0.5*(k)*t1.^2));
phi26 = a2.*exp(j*2*pi*(f26*t2+0.5*(k)*t2.^2));
phi31 = a3.*exp(j*2*pi*(f31*t3+0.5*(k)*t3.^2));
phi43 = a4.*exp(j*2*pi*(f43*t4+0.5*(k)*t4.^2));
phi55 = a5.*exp(j*2*pi*(f55*t5+0.5*(k)*t5.^2));
phi64 = a6.*exp(j*2*pi*(f64*t6+0.5*(k)*t6.^2));
phi72 = a7.*exp(j*2*pi*(f72*t7+0.5*(k)*t7.^2));
phi87 = a8.*exp(j*2*pi*(f87*t8+0.5*(k)*t8.^2));
%% 时域表示 %%
s1 = phi18+phi26+phi31+phi43+phi55+phi64+phi72+phi87;
s1 = s1/max(abs(s1));
figure
plot(ts1)
set(gca‘ytick‘-1:0.5:1)
set(gca‘xtick‘0:2.0e-6:8.0e-6)
xlabel(‘time[second]‘)
ylabel(‘amplitude‘)
title(‘waveform a1‘)
%% 频域表示 %%
fs1 = fftshift(fft(s1));
fs1 = abs(fs1);
fs1 = fs1/max(fs1);
fs1 = 20*log10(fs1);
fx = linspace((B-0)/nBn);
figure
plot(fxfs1)
set(gca‘ytick‘-50:10:0)
set(gca‘xtick‘0:100e6:400e6)
axis([0 400e6 -50 0])
xlabel(‘frequency[Hz]‘)
ylabel(‘normalized modulus[dB]‘)
title(‘waveform a1‘)
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 2666302 2017-12-20 18:26 mimo radar OFDM Chirp waveform design\MIMO SAR OFDM Chirp Waveform Diversity Design With Random Matrix Modulation.pdf
文件 3036 2017-12-20 12:12 mimo radar OFDM Chirp waveform design\ofdmchirpa1.m
文件 3017 2017-12-20 12:13 mimo radar OFDM Chirp waveform design\ofdmchirpa2.m
目录 0 2017-12-27 12:20 mimo radar OFDM Chirp waveform design
----------- --------- ---------- ----- ----
2672355 4
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