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GPS捕獲 通過matlab仿真代碼實現

代碼片段和文件信息
M=5;
N=1;
fs=80e6;
ind=9900:10100;
t=0:1/fs:10000/fs;
f0=1.023e6;
%code=cacode(1N*1.023e6?fs100000);
code?=?gcode(N*1.023e6?fs?10000);
x=2*pi*f0*M*t(1:length(code));
Xnm1=code.*sign(exp(j*1*x));
Xnm1p=code.*sign(exp(-j*1*x));
Xnm3=code.*(exp(j*3*x));
Xnm3p=code.*(exp(-j*3*x));
Xnm5=code.*sign(exp(j*5*x));
Xnm5p=code.*sign(exp(-j*5*x));
Xnm7=code.*sign(exp(j*7*x));
Xnm7p=code.*sign(exp(-j*7*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(30fm);
%Cnm=filter(b1CnmO);
Cnm=CnmO;
figure(1)
subplot(211);
tmp=abs(fft(Xnm3));
plot(20*log10(fftshift(tmp)));
subplot(212);
tmp=abs(fft(Cnm));
plot(20*log10(fftshift(tmp)));
figure(2)
xc1=abs(xcorr(CnmXnm1))+abs(xcorr(CnmXnm1p));
xc3=abs(xcorr(CnmXnm3))+abs(xcorr(CnmXnm3p));
xc5=abs(xcorr(CnmXnm5))+abs(xcorr(CnmXnm5p));
xc7=abs(xcorr(CnmXnm7))+abs(xcorr(CnmXnm7p));
xias=(ind-10000)*1.023/80;
%plot(xiasxc2(9900:10100)xiasxc3(9900:10100)xiasxc1(9900:10100)+xc1n(9900:10100));
%figure(3)
%plot(xiassqrt(xc2(9900:10100).^2+xc3(9900:10100).^2)xiasxc4(9900:10100));
subplot(221)
plot(xiasxc1(ind));
subplot(222)
plot(xiasxc3(ind));
subplot(223)
plot(xiasxc5(ind));
subplot(224)
plot(xiasxc7(ind));
????
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????1301??2006-07-05?17:41??BOC\boc.m
?????文件???????1150??2006-06-02?16:06??BOC\codegen.m
?????文件???????1175??2006-07-04?16:53??BOC\cacode.m
?????文件???????1280??2006-07-04?16:52??BOC\boc.asv
?????文件????????800??2006-06-23?15:07??BOC\boc_bak.m
?????文件???????1432??2006-07-04?16:53??BOC\gcode.m
?????目錄??????????0??2006-07-20?23:03??BOC
?????文件???????1432??2006-08-03?22:23??BOC\BOC\boc.asv
?????文件???????1468??2006-08-20?00:05??BOC\BOC\boc.m
?????文件????????800??2006-06-23?15:07??BOC\BOC\boc_bak.m
?????文件???????1175??2006-07-04?16:53??BOC\BOC\cacode.m
?????文件???????1150??2006-06-02?16:06??BOC\BOC\codegen.m
?????文件???????1432??2006-07-04?16:53??BOC\BOC\gcode.m
?????文件?????????90??2006-08-20?00:24??BOC\BOC\Unti
?????目錄??????????0??2006-08-20?19:30??BOC\BOC
-----------?---------??----------?-----??----
????????????????14903????????????????????16
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