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//Chapter-11 example 63
//==========================================================================
clc;
clear;
//Given data
G = 50; // antenna gain in dB
f = 6*10^9; // operating frequency
Te = 1000; // Noise temp in kelvin
SNR = 20; // min SNR in dB
L = 10; // Losses in dB
F = 3; // Noise Figure in dB
RCS = -10; // Radar cross section in dB
K = 1.38*10^-23; // boltzman constant
Vo = 3*10^8; //vel of Em wave in m/s;
DC = 0.3; // Duty cycle
R = 300*10^3; // Range in kms
Pav = 1000; // Average power in watts
SV = 20; //search volume
Ts = 3; //Scan time
//calculations
Pav1 = 10*log10(Pav) //conversion to dB
KT = 10*log10(Te*K) //conversion to dB
R4 = 10*log10(R^4) //conversion to dB
Ts1 = 10*log10(Ts) //conversion to dB
//SNR = (Pav*A*RCS*Ts)/(16*R^4*K*Te*L*F*SV)
A = (SNR-Pav1-Ts-RCS+16+R4+KT+L+F+SV);//aperture
Pt = Pav/DC; // peak ower in watts
//A1 =10^(A/10); // antilog calculation
//output
mprintf('A = %3.2f dB\n Peak power Pt = %3.2f KW\n',A,Pt/1000);
//mprintf('A = %3.2f m^2\n',A1)
mprintf(' Note: calculation error in textbook at KT')
//=============================================================================
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