function?sigma_back=MIMICS（LAIMv）

RH=1.2*10^（-2）;%rms?height均方差高度
CL=12.5*10^（-2）;%correlation?length相關(guān)長度
C=3*10^8;%光速常數(shù)
F=5.3*10^9;%頻點
Er=41.84*Mv+5.04+i*（4.16+1.6*Mv）;%介質(zhì)介電常數(shù)
N=100;
Ur=1;%磁導(dǎo)率
Thete=20/180*pi;
KA=2*pi/（C/F）;%空氣air的波數(shù)
KT=sqrt（Ur*Er）*KA;

KL=KA*CL;
KR=KA*RH;

%KL=8;
%KR=0.1;
%Tx=1;
%for?thete=0:1:90
%????Thete=thete/180*pi;
%????ttex（Tx1）=thete;
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????%垂直和水平反非聶耳射系數(shù)
????rhh=（Er*cos（Thete）-sqrt（Er-sin（Thete）^2））??/??（Er*cos（Thete）+sqrt（Er-sin（Thete）^2））;%c垂直極化非聶耳反射系數(shù)
????rvv=??（cos（Thete）-sqrt（Er-sin（Thete）^2））???/????（cos（Thete）+sqrt（Er-sin（Thete）^2））;%水平極化非聶耳反射系數(shù)
????Rvv=rhh;%abs（rvv）^2;
????Rhh=rvv;%abs（rhh）^2;
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