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<P>pll.m函数<BR><BR>function[tt,v1,fo,fs,t1,vc,th1,fn,c,vo]=pll(fii,foo,Kd,T,th0,dt);<BR>%<BR>% [t1,vc,th1,fn,c,vo]=pll(fi,fo,Kd,T,th0,dt);<BR>% Default:pll(800,1000,1,.1,[0 0],.00025);BBI 99<BR>global K fi fo<BR>if nargin<5;th0=[0 0];end;<BR>if nargin<2;foo=1000;end;<BR>if nargin<1;fii=800;end;<BR>if nargin<3;Kd=1;end;<BR>if nargin<4;T=100/foo;end;<BR>if nargin<6;dt=.25/foo;end;<BR>fo=foo;fi=fii;Kv=2*pi*fo;K=Kv*Kd;<BR>vs=version;vs=vs(1);<BR>if strcmp(vs,'4');<BR> [t,th]=ode23('equation',0,T,th0) ;whitebg('w') ;delete(1);<BR>else;<BR> dT=.25/fi;[t,th] =ode45('equation',0:dT:T,th0');<BR>end;<BR>t1=0;dt:T-dt;<BR>th1=spline(t,th(:,1),t1);th2=spline(t,th(:,2),t1);<BR>vo=cos(2*pi*fo*t1+th1);<BR>fn=1/T;n=length(vo);c=abs(fft(vo))/n*2;<BR>I=1:n/2;fn=fn*(I-1);c=c(I);<BR>I=1:n/2;fn=fn*(I-1);c=c(I);<BR>I=find(c>.01);fn=fn(I);cn=20*log10(c(I));<BR>vc=th2/Kv;f=th2/(2*pi)+fo;<BR>%==========================================================================<BR>figure('Units','normal','Pos',[0.006 .05 .985 .88]);<BR>set(gcf,'NumberTitle','off','Name',nstr);<BR>subplot(221);plot(t1,vc,'b');title('Control Voltage');<BR>xlabel('t(ms)');v=axis;v3=v(3)*1.17;zoom xon;<BR>if abs(v3)<1e-06;v3=-0.084;end;<BR>if abs(min(vc))+max(vc)<1e-04;v3=-1.337;end;<BR>subplot(223);plot(t1,f,'k');<BR>title('Frequency');xlabel('t(ms)');<BR>subplot(224);plot(t1,th1,'k');<BR>title('Phase');xlabel('t(ms)');<BR>m=length(I);<BR>for i=1:m;<BR> subplot(222);<BR> plot (fn(i)+[0 0],[-40 cn(i)],'b');hold on;<BR>end;<BR>plot(fn(m)+2/T,0,'b',fn(1)-2/T,0,'b');<BR>title('Spectrum');hold off;xlbel('f(kHz)');pause(3);<BR>%==========================================================================<BR>m=10*4;n=length(t1);n2=n-m+1;<BR>dt=t1(2);T=m*dt;dt=.1*dt;fs=1/dt;<BR>tt=0:dt:T;tt2=t1(n2)+ tt;<BR>v1=spline(t1(1:m),vc(1:m),tt);<BR>v2=spline(t1(n2:n),vc(n2:n),tt2);<BR>y1=vco(v1,fo,fs);y2=vco(v2,fo,fs);<BR>H2=figure('Name',nstr,'Num','off','Pos',[5100 790 400]);<BR>subplot(211);plot(tt,y1,'b',tt,sin(2*pi*fi*tt),'r');<BR>set(gca,'units','pix','pos',[40 240 720 140]);xlabel('t(ms)');<BR>subplot(212);plot(tt2,sin(2*pi*fi*tt2),'r',tt2,y2,'b');<BR>set(gca,'units','pix','pos',[40 45 720 140]);<BR>axis([tt2(1) tt2(length(tt2))-1 1]);<BR>xlabel('t(ms)');v=axis;zoom xon;<BR>...........................................<BR>下面这个是PLL.m函数在运行过程中要调用的equation.m函数,该函数用来描述微分方程。</P>
<P>function yp=equation(x,y);<BR>%<BR>%BBI 99<BR>global K fi fo<BR>RC=25/(2*pi*fo); %滤波器的时间常数<BR>yp(1)=y(2);<BR>yp(2)=K/RC*sin(2*pi*fi*x).*cos(2*pi*fo*x+y(1))-y(2)/RC;<BR>v=version;v=v(1);<BR>if strcmp (v,'5');yp=yp';end;<BR>..............................<BR>这是个仿真锁相环的程序<BR>这个程序是不是不全啊,Equation子程序能不能这样直接写在PLL函数的后面,还是要单独调用啊?具体怎么调用啊?而且这个程序有语法错误.麻烦高手看一下啊!谢了!<BR></P> |