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两径模型

2010-06-22 11:41:33| 分类：研一下 | 标签： |举报 |字号大中小订阅

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两径模型 - 柒.smilence - 此地花開成海

%two-ray model
%柒 at 904
%2010/06/21
close all;
clear all;

Pt = 1;
ht = 50;
hr = 2;
f = 9e8;
c = 3e8;
lambda = c/f;
R = -1;
Gl = 1;
%Gr = 1;
Gr = [1,0.316,0.1,0.01];

for i=1:4
    dc = 4*ht*hr/lambda;
    d = 1:100000;
    dBd = log10(d);
    h1 = ht + hr;
    h2 = ht - hr;
    delta_dis = sqrt(h1^2 + d.^2) - sqrt(h2^2 + d.^2);
    delta_phs = 2*pi*delta_dis/lambda;

Pr = Pt*(lambda/(4*pi))^2*(abs(sqrt(Gl)./sqrt(h2^2 + d.^2) + R*sqrt(Gr(i))*exp(-j*delta_phs)./sqrt(h1^2 + d.^2))).^2;

    dBPr = 10*log10(Pr)-10*log10(Pr(1));
    switch i
        case 1
            plot(dBd,dBPr,'b','LineWidth',2);
        case 2
            plot(dBd,dBPr,'r','LineWidth',2);
        case 3
            plot(dBd,dBPr,'k','LineWidth',2);
        case 4
            plot(dBd,dBPr,'m','LineWidth',2);
    end
    hold on
end

grid on
plot([log10(dc) log10(dc)],[-120 40],':r','LineWidth',2);
plot([log10(ht) log10(ht)],[-120 40],'--r','LineWidth',2);
legend('Gr = 1','Gr = 0.316','Gr = 0.1','Gr = 0.01','dc','ht')

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              blogAbstract:'<DIV\>\r\n<P align=center\><IMG title=\"两径模型 - 柒.smilence - 此地花開成海\" alt=\"两径模型 - 柒.smilence - 此地花開成海\" style=\"MARGIN: 0px 10px; FLOAT: none; cssFloat: none; float: none;\" src=\"http://img.ph.126.net/3sNkBJmn-lhY9A_TqSljug==/943785596911120995.jpg\"\></P\>\r\n<P align=left\>\r\n</P\><HR id=null\>\r\n<FONT color=#008000\>%two-ray model<BR\>%柒 at 904<BR\>%2010/06/21<BR\>close all;<BR\>clear all;</FONT\></P\>\r\n<P align=left\><FONT color=#008000\>Pt = 1;<BR\>ht = 50;<BR\>hr = 2;<BR\>f = 9e8;<BR\>c = 3e8;<BR\>lambda = c/f;<BR\>R = -1;<BR\>Gl = 1;<BR\>%Gr = 1;<BR\>Gr = [1,0.316,0.1,0.01];</FONT\></P\>\r\n<P align=left\><FONT color=#008000\>for i=1:4<BR\>    dc = 4*ht*hr/lambda;<BR\>    d = 1:100000;<BR\>    dBd = log10(d);<BR\>    h1 = ht + hr;<BR\>    h2 = ht - hr;<BR\></FONT\></P\></DIV\>',
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