ca_gen.m

验证功率倒置算法对gps信号中大功率单频信号的消除

% CA code generate

function out=CA_gen()

fbcon1=[0 0 1 0 0 0 0 0 0 1];
fbcon2=[0 1 1 0 0 1 0 1 1 1];
N=2^10-1;
register1=ones(1,10);
register2=ones(1,10);
out(1)=mod(register1(10)+register2(2)+register2(6),2);
for i=2:N
    newregister1(1)=mod(sum(fbcon1.*register1),2);
    newregister2(1)=mod(sum(fbcon2.*register2),2);
    for j=2:10
        newregister1(j)=register1(j-1);
        newregister2(j)=register2(j-1);
    end
    register1=newregister1;
    register2=newregister2;
    out(i)=mod(register1(10)+register2(2)+register2(6),2);
    if out(i)==0
        out(i)=-1;
    else
        out(i)=1;
    end
end

% xc=xcorr([out out out],'biased');
% plot(xc)
% aaa=fft(xc,1024);
% % w=(0:511)/512*(3000/2);%
% figure,plot(abs(aaa));