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M=2; 
N=1; 
fs=80e6; 
t=0:1/fs:10000/fs; 
f0=1.023e6; 
code=cacode(1,N*1.023e6, fs,10000,0); 
x=2*pi*f0*M*t(1:length(code)); 
 
Xnm=code.*exp(j*x); 
Xnm2=code.*sign(exp(j*x));%sign(sin(x))+j*sign(cos(x)) 
 
CnmO=code.*sign(sin(x)); 
CnmQ=code.*sign(cos(x)); 
 
 
f = [0 0.02 0.02 1]; m = [1 1 0 0]; 
b = fir2(30,f,m); 
%Cnm=filter(b,1,CnmO); 
Cnm=CnmO; 
figure(1) 
subplot(2,1,1); 
tmp=abs(fft(Xnm)); 
plot(20*log10(tmp)); 
subplot(2,1,2); 
tmp=abs(fft(Cnm)); 
plot(20*log10(tmp)); 
 
figure(2) 
xc1=abs(xcorr(Cnm,Xnm2)); 
xc2=abs(xcorr(Cnm,CnmO)); 
xc3=abs(xcorr(Cnm,CnmQ)); 
xc4=xcorr(Cnm,code); 
xias=((9900:10100)-10000)*1.023/80; 
plot(xias,xc2(9900:10100),xias,xc3(9900:10100),xias,xc1(9900:10100)); 
figure(3) 
plot(xias,sqrt(xc2(9900:10100).^2+xc3(9900:10100).^2),xias,xc4(9900:10100));