GA Fitness Function to fit model simulation to measured

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segun 2015-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/257667-ga-fitness-function-to-fit-model-simulation-to-measured

编辑： segun 2015-11-27

Please can one help with suitable fitness function that can make model simulation fit the measurements after extracting Zcb1, Zcb2 and Zcb3 for this ga code. I tried it several times as shown below no success.

function V = PARAMETEREXTRACT(x) f =[1 2 3 4 5]; L=0.03; Zo = 100; Zcb1= x(1); Zok = (1 + (0.055*(1-1i))/sqrt(f)); Zcbk1 = abs(Zcb1*Zok); u = ((494)+(36/f))*1.0e-9; Vpk = 100/u ; Attk = 1.05*(1.9108*sqrt(f)+0.022*f+0.2/sqrt(f))+4*0.04*sqrt(f); Qk = ((Attk)*(0.01))/(8.68588963807); Bk = (2*pi*f*1.0e6)/(Vpk); Yk =(Qk + 1i*Bk); H = (exp(Yk*L) + exp(-Yk*L))/2; N = (exp(Yk*L) - exp(-Yk*L))/2; D1 = (2*Zcbk1*Zo*H) + ((Zcbk1^2+Zo^2)*N); S111 = ((Zcbk1^2-Zo^2)*N)/D1; S112 = (2*Zcbk1*Zo)/D1; S121 = (2*Zcbk1*Zo)/D1; S122 = ((Zcbk1^2-Zo^2)*N)/D1; T111 = ((S112*S121)-(S111*S122))/S121; T112 = S111/S121; T121 = -(S122/S121); T122 = (1/S121); Zcb2= x(2); Zcbk2 = abs(Zcb2*Zok); D2 = (2*Zcbk2*Zo*H) + ((Zcbk2^2+Zo^2)*N); S211 = ((Zcbk2^2-Zo^2)*N)/D2; S212 = (2*Zcbk2*Zo)/D2; S221 = (2*Zcbk2*Zo)/D2; S222 = ((Zcbk2^2-Zo^2)*N)/D2; T211 = ((S212*S221)-(S211*S222))/S221; T212 = S211/S221; T221 = -(S222/S221); T222 = (1/S221); Zcb3= x(3); Zok = (1 + (0.055*(1-1i))/sqrt(f)); Zcbk3 = abs(Zcb3*Zok); D3 = (2*Zcbk3*Zo*H) + ((Zcbk3^2+Zo^2)*N); S311 = ((Zcbk3^2-Zo^2)*N)/D3; S312 = (2*Zcbk3*Zo)/D3; S321 = (2*Zcbk3*Zo)/D3; S322 = ((Zcbk3^2-Zo^2)*N)/D3; T311 = ((S312*S321)-(S311*S322))/S321; T312 = S311/S321; T321 = -(S322/S321); T322 = (1/S321); % program to cascade the Three T matrix to obtain a single output T T1 = [T111 T112 ; T121 T122]; T2 = [T211 T212 ; T221 T222]; T3 = [T311 T312 ; T321 T322]; T = T1*T2*T3; % Program to convert cascaded T matrix output back to S matrix S11 = T(1,2)/T(2,2); % Model simulation Au = 20*log10(abs(S11)); % measurements Ab=[-35.2 -31.2 -29.5 -28.4 -29 ]; % Fitness function Y = abs(abs(Ab)-abs(Au)); V=Y;