Matlab实现HHT程序源码非常珍贵.docx
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Matlab实现HHT程序源码非常珍贵
Matlab实现HHT程序(源码-非常珍贵)
clearall;
x=load('06514135360001170106.TXT');
fs=1000000;
N=length(x);
t=0:
1/fs:
(N-1)/fs;
z=x;
c=emd(z);
%计算每个IMF分量及最后一个剩余分量residual与原始信号的相关性
[m,n]=size(c);
fori=1:
m;
a=corrcoef(c(i,:
),z);
xg(i)=a(1,2);
end
xg;
fori=1:
m-1
%--------------------------------------------------------------------
%计算各IMF的方差贡献率
%定义:
方差为平方的均值减去均值的平方
%均值的平方
%imfp2=mean(c(i,:
),2).^2
ylabel(['signal','Amplitude'])
fori=1:
m-1
subplot(m+1,1,i+1);
set(gcf,'color','w')
plot(t,c(i,:
),'k')
set(gca,'fontname','timesNewRoman')
set(gca,'fontsize',14.0)
ylabel(['imf',int2str(i)])
end
subplot(m+1,1,m+1);
set(gcf,'color','w')
plot(t,c(m,:
),'k')
set(gca,'fontname','timesNewRoman')
set(gca,'fontsize',14.0)
ylabel(['r',int2str(m-1)])
%画出每个IMF分量及剩余分量residual的幅频曲线
figure
(2)
subplot(m+1,1,1)
set(gcf,'color','w')
[f,z]=fft(t,z);
plot(f,z,'k')
set(gca,'fontname','timesNewRoman')
set(gca,'fontsize',14.0)
ylabel(['initialsignal',int2str(m-1),'Amplitude'])
fori=1:
m-1
subplot(m+1,1,i+1);
set(gcf,'color','w')
[f,z]=fft(t,c(i,:
));
plot(f,z,'k')
set(gca,'fontname','timesNewRoman')
set(gca,'fontsize',14.0)
ylabel(['imf',int2str(i),'Amplitude'])
end
subplot(m+1,1,m+1);
set(gcf,'color','w')
[f,z]=fft(t,c(m,:
));
plot(f,z,'k')
set(gca,'fontname','timesNewRoman')
set(gca,'fontsize',14.0)
ylabel(['r',int2str(m-1),'Amplitude'])
hx=hilbert(z);
xr=real(hx);xi=imag(hx);
%计算瞬时振幅
sz=sqrt(xr.^2+xi.^2);
%计算瞬时相位
sx=angle(hx);
%计算瞬时频率
dt=diff(t);
dx=diff(sx);
sp=dx./dt;
figure(6)
plot(t(1:
N-1),sp)
title('瞬时频率')
%计算HHT时频谱和边际谱
[A,fa,tt]=hhspectrum(c);
[E,tt1]=toimage(A,fa,tt,length(tt));
figure(3)
disp_hhs(E,tt1)%二维图显示HHT时频谱,E是求得的HHT谱
pause
figure(4)
fori=1:
size(c,1)
faa=fa(i,:
);
[FA,TT1]=meshgrid(faa,tt1);%三维图显示HHT时频图
surf(FA,TT1,E)
title('HHT时频谱三维显示')
holdon
end
holdoff
E=flipud(E);
fork=1:
size(E,1)
bjp(k)=sum(E(k,:
))*1/fs;
end
f=(1:
N-2)/N*(fs/2);
figure(5)
plot(f,bjp);
xlabel('频率/Hz');
ylabel('信号幅值');
title('信号边际谱')%要求边际谱必须先对信号进行EMD分解
function[A,f,tt]=hhspectrum(x,t,l,aff)
error(nargchk(1,4,nargin));
ifnargin<2
t=1:
size(x,2);
end
ifnargin<3
l=1;
end
ifnargin<4
aff=0;
end
ifmin(size(x))==1
ifsize(x,2)==1
x=x';
ifnargin<2
t=1:
size(x,2);
end
end
Nmodes=1;
else
Nmodes=size(x,1);
end
lt=length(t);
tt=t((l+1):
(lt-l));
fori=1:
Nmodes
an(i,:
)=hilbert(x(i,:
)')';
f(i,:
)=instfreq(an(i,:
)',tt,l)';
A=abs(an(:
l+1:
end-l));
ifaff
disprog(i,Nmodes,max(Nmodes,100))
end
end
functiondisp_hhs(im,t,inf)
%DISP_HHS(im,t,inf)
%displaysinanewfigurethespectrumcontainedinmatrix"im"
%(amplitudesinlog).
%
%inputs:
-im:
imagematrix(e.g.,outputof"toimage")
%-t(optional):
timeinstants(e.g.,outputof"toimage")
%-inf(optional):
-dynamicrangeindB(wrtmax)
%default:
inf=-20
%
%utilisation:
disp_hhs(im);disp_hhs(im,t);disp_hhs(im,inf)
%disp_hhs(im,t,inf)
figure
colormap(bone)
colormap(1-colormap);
ifnargin==1
inf=-20;
t=1:
size(im,2);
end
ifnargin==2
iflength(t)==1
inf=t;
t=1:
size(im,2);
else
inf=-20;
end
end
ifinf>=0
error('infdoitetre<0')
end
M=max(max(im));
im=log10(im/M+1e-300);
inf=inf/10;
imagesc(t,fliplr((1:
size(im,1))/(2*size(im,1))),im,[inf,0]);
set(gca,'YDir','normal')
xlabel(['time'])
ylabel(['normalizedfrequency'])
title('Hilbert-Huangspectrum')
function[f,z]=fftfenxi(t,y)
L=length(t);N=2^nextpow2(L);
%fft默认计算的信号是从0开始的
t=linspace(t
(1),t(L),N);deta=t
(2)-t
(1);
m=0:
N-1;
f=1./(N*deta)*m;
%下面计算的Y就是x(t)的傅里叶变换数值
%Y=exp(i*4*pi*f).*fft(y)%将计算出来的频谱乘以exp(i*4*pi*f)得到频移后[-2,2]之间的频谱值
Y=fft(y);
z=sqrt(Y.*conj(Y));