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Diffstat (limited to '3773/CH17/EX17.5/Ex17_5.sce')
| -rw-r--r-- | 3773/CH17/EX17.5/Ex17_5.sce | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/3773/CH17/EX17.5/Ex17_5.sce b/3773/CH17/EX17.5/Ex17_5.sce new file mode 100644 index 000000000..3ccd413f7 --- /dev/null +++ b/3773/CH17/EX17.5/Ex17_5.sce @@ -0,0 +1,23 @@ +//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) |