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//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
//Example 17-3.1
clc;
//Variable Initialization
k = 1.38e-23 //Boltzmann's constant (J/K)
trans_pow = 5 //Transponder power (W)
r = 36000e3 //Distance (m)
wave_lt = 7.5e-2 //Wavelength (m)
ant_gain = 30 //Antenna gain (dB)
earth_ant = 38 //Earth station antenna gain (dB)
Tsys = 100 //Earth station receiver system temperature (K)
bw = 30e6 //Bandwidth (Hz)
//Calculations
s_n = wave_lt**2/(16*(%pi**2)*(r**2)*k*Tsys*bw)
s_n = 10*log10(s_n) //Signal to Noise ratio (dB)
trans_pow_db = 10*log10(trans_pow) //Transponder power (dB)
erp = ant_gain + trans_pow_db //Effective radiated power (dB)
s_n_downlink = erp + earth_ant + s_n //Signal to Noise ratio downlink(dB)
//Result
mprintf("The earth station S/N ratio is %.2f dB",s_n_downlink)
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