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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)