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//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
//Example 17-2.2
clc;
//Variable Initialization
phy_aper = 2208 //Physical aperture (m^2)
f = 1415e6 //Frequency (Hz)
aper_eff = 0.54 //Aperture efficiency (unitless)
Tsys = 50 //System temperature (K)
bw = 100e6 //RF Bandwidth (Hz)
t_const = 10 //Output time constant (s)
sys_const = 2.2 //System constant (unitless)
k = 1.38e-23 //Boltzmann's constant (J/K)
//Calculations
Tmin = sys_const*Tsys/(sqrt(bw*t_const)) //Minimum detectable temperature(K)
eff_aper = aper_eff*phy_aper //Effective aperture (m^2)
Smin = 2*k*Tmin/eff_aper //Minimum detectable flux density (W/m^2/Hz)
//Result
mprintf("The minimum detectable flux density is %.1e W/m^2/Hz" ,Smin)
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