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[ÇóÖú] ´óÉñÇóÖú£¡£¡£¡£¡MATLABÑ­»·ÔËÐв»ÏÂÈ¥~~~~

clear all;
%ÇóµØÖʲÎÊý
Vp=[1.70 1.96 2.71 3.76 4.69 6.40];
Vs=[0.98 1.13 1.57 2.17 2.71 3.70];
Den=[1.28 1.36 1.59 1.91 2.19 2.71];
Z=[0 0.18 0.73 1.71 2.9 5.58];
miu=zeros(1,length(Vs));
for j=1:1:length(Vs)
    miu(j)=(Vs(j))^2*Den(j);
end
WL=zeros(1,length(Vp));
for j=1:1:length(Vp)
    WL(j)=(Vp(j))^2*Den(j)-2*miu(j);
end
N=2048;
f=(0:N-1)*100/N;
A=zeros(1,length(Vp));
B=A;
for j=1:1:6
    A(j)=4*miu(j)*(WL(j)+miu(j))/(WL(j)+2*miu(j));
    B(j)=1/(WL(j)+2*miu(j));
end
AAA=zeros(2,2);
I=eye(2);
for i=2:1:2%N/4´ÎÑ­»·£¬Çó½âÿ¸öƵÂÊËù¶ÔÓ¦µÄ²¨Êý
      syms kk;
     %¼ÆËãE¾ØÕó
     for j=1:1:6
     C(j)=vpa((kk^2-(2*pi*f(i)/Vs(j))^2)^0.5,5);%v
     D(j)=vpa((kk^2-(2*pi*f(i)/Vp(j))^2)^0.5,5);%r
     X(j)=kk^2+(C(j))^2;
     X(j)=vpa(X(j),5);
     E11{j}=[Vp(j)*kk Vs(j)*C(j);Vp(j)*D(j) Vs(j)*kk]/(2*pi*f(i));
     E11{j}=vpa(E11{j},5);
     E12{j}=[Vp(j)*kk Vs(j)*C(j);-Vp(j)*D(j) -Vs(j)*kk]/(2*pi*f(i));
     E12{j}=vpa(E12{j},5);
     E21{j}=[-2*Vp(j)*miu(j)*D(j)*kk -Vs(j)*miu(j)*X(j);-Vp(j)*miu(j)*X(j) -2*Vs(j)*miu(j)*C(j)*kk]/(2*pi*f(i));
     E21{j}=vpa(E21{j},5);
     E22{j}=[2*Vp(j)*miu(j)*D(j)*kk Vs(j)*miu(j)*X(j);-Vp(j)*miu(j)*X(j) -2*Vs(j)*miu(j)*C(j)*kk]/(2*pi*f(i));
     E22{j}=vpa(E22{j},5);
     end
     %¼ÆËã¶Ô½ÇÏòÁ¿
     for j=1:1:5
         digits(6);
        Ad11(j)=vpa(exp(-D(j)*(Z(j+1)-Z(j))));
        Ad22(j)=exp(-C(j)*(Z(j+1)-Z(j)));
        Ad22(j)=vpa(Ad22(j));
        Ad{j}=[Ad11(j) 0;0 Ad22(j)];
     end
    %¼ÆËãÐÞ¸ÄϵÊý
    for j=1:1:4
      digits(6);
      Au11(j)=vpa(exp(-D(j+1)*(Z(j+2)-Z(j+1))));
      Au22(j)=vpa(exp(-C(j+1)*(Z(j+2)-Z(j+1))));
      Au{j}=[Au11(j) 0;0 Au22(j)];
      EE1{j}=[E11{j+1} -E12{j};E21{j+1} -E22{j}]^(-1);
      EE1{j}=vpa(EE1{j});
      EE2{j}=[E11{j} -E12{j+1};E21{j} -E22{j+1}];
      Add{j}=[Ad{j} AAA;AAA Au{j}];
      MRT{j}=vpa(EE1{j}*EE2{j}*Add{j});
      Tdd{j}=[MRT{j}(1) MRT{j}(5);MRT{j}(2) MRT{j}(6)];
      Rud{j}=[MRT{j}(9) MRT{j}(13);MRT{j}(10) MRT{j}(14)];
      Rrdu{j}=[MRT{j}(3) MRT{j}(7);MRT{j}(4) MRT{j}(8)];
      Tu{j}=[MRT{j}(11) MRT{j}(15);MRT{j}(12) MRT{j}(16)];
    end
    %¼ÆËãµÚN²ãÐÞÕýϵÊý
    digits(6);
    EE1{5}=[E11{6} -E12{5};E21{6} -E22{5}]^(-1);
    EE2{5}=[E11{5}*Ad{5};E21{5}*Ad{5}];
    MRT{5}=vpa(EE1{5}*EE2{5});
    %¼ÆËã¹ãÒåÐÞÕýϵÊý
    Rdu{5}=[MRT{5}(3) MRT{5}(7);MRT{5}(4) MRT{5}(8)];
     for k=1:1:4
        Rdu{k}=AAA;
    end
    for j=4:-1:1
        digits(4);
        Rud{j}=vpa(Rud{j});
        Tdd{j}=vpa(Tdd{j});
        Tu{j}=vpa(Tu{j});
        Rdu{j+1}=vpa(Rdu{j+1});
        Td{j}=vpa((I-Rud{j}*Rdu{j+1})^(-1)*Tdd{j});
        Rdu{j}=vpa(Rrdu{j}+Tu{j}*Rdu{j+1}*Td{j});
    end
end
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