initial commit / add all books

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diff --git a/3773/CH17/EX17.1/Ex17_1.sce b/3773/CH17/EX17.1/Ex17_1.sce
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+//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
+//Example 17-1.1
+clc;
+
+//Variable Initialization
+Ta = 0.24   //Antenna temperature (K)
+ang = 0.005     //Subtended angle (degrees)
+hpbw = 0.116    //Antenna half power beamwidth (degrees)
+
+//Calculations
+Ts = Ta*(hpbw**2)/(%pi*(ang**2/4))
+
+//Result
+mprintf("The average temperature of the surface is %d K", Ts)
diff --git a/3773/CH17/EX17.2/Ex17_2.sce b/3773/CH17/EX17.2/Ex17_2.sce
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index 000000000..8c14ef9b1
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+//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
+//Example 17-1.2
+clc;
+
+//Variable Initialization
+eff_aper = 500      //Antenna effective aperture (m^2)
+wave_lt = 20e-2        //Wavelength (m)
+Tsky = 10.0           //Sky temperature (K)
+Tgnd = 300.0          //Ground temperature (K)
+beam_eff = 0.7      //Beam efficiency (unitless)
+aper_eff = 0.5      //Aperture efficiency (unitless)
+
+//Calculations
+phy_aper = aper_eff/eff_aper    //Physical aperture (m^2)
+diam = 2*sqrt(phy_aper/%pi)  //Antenna diameter (m)
+diam_l = diam/wave_lt       //Antenna diameter (lambda)
+
+ta_sky = Tsky*beam_eff      //Sky contribution to antenna temp. (K)
+ta_side = 0.5*Tsky*(1-beam_eff) //Side-lobe contribution to antenna temp. (K)
+ta_back = 0.5*Tgnd*(1-beam_eff) //Back-lobe contribution to antenna temp. (K)
+
+Ta = ta_sky + ta_side + ta_back
+
+//Result
+mprintf("The total antenna temperature is %.1f K", Ta)
diff --git a/3773/CH17/EX17.3/Ex17_3.sce b/3773/CH17/EX17.3/Ex17_3.sce
new file mode 100644
index 000000000..f86b1619c
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+++ b/3773/CH17/EX17.3/Ex17_3.sce
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+//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
+//Example 17-2.1
+clc;
+
+//Variable Initialization
+Tn = 50.0     //Noise temperature (K)
+Tphy = 300.0      //Physical temperature (K)
+Eff = 0.99       //Efficiency (unitless)
+Tn_stg = 80.0       //Noise temperature of first 3 stages (K)
+gain_db = 13.0       //Gain (dB)
+Tphy_tr = 300   //Transmission line physical temperature (K)
+Eff_tr = 0.9    //Transmission line efficiency (unitless)
+
+//Calculations
+gain = 10**(gain_db/10)
+T_r = Tn_stg + Tn_stg/(gain) + Tn_stg/(gain**2)                //Receiver noise temperature (K)
+Tsys = Tn + Tphy*(1/Eff - 1) + Tphy_tr*(1/Eff_tr - 1) + (1/Eff_tr)*T_r                //System temperature (K)
+
+//Result
+mprintf("The system temperature is %.0f K",Tsys)
diff --git a/3773/CH17/EX17.4/Ex17_4.sce b/3773/CH17/EX17.4/Ex17_4.sce
new file mode 100644
index 000000000..852718927
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+++ b/3773/CH17/EX17.4/Ex17_4.sce
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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)
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
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+++ b/3773/CH17/EX17.5/Ex17_5.sce
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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)
diff --git a/3773/CH17/EX17.6/Ex17_6.sce b/3773/CH17/EX17.6/Ex17_6.sce
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index 000000000..0aa1c0bc9
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+//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
+//Example 17-4.1
+clc;
+
+//Variable Initialization
+tf = 0.693      //Absorption co-efficient (unitless)
+Te = 305        //Earth temperature (K)
+Ta = 300        //Satellite antenna temperature (K)
+
+//Calculations
+Tf = (Ta - Te*exp(-tf))/(1-exp(-tf))
+
+//Result
+mprintf("The forest temperature is %.0f K", Tf)
diff --git a/3773/CH17/EX17.7/Ex17_7.sce b/3773/CH17/EX17.7/Ex17_7.sce
new file mode 100644
index 000000000..2551c6bd7
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+++ b/3773/CH17/EX17.7/Ex17_7.sce
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+//Chapter 17: Antenna Temperature, Remote Sensing and Radar Cross Section
+//Example 17-5.1
+clc;
+
+//Variable Initialization
+f = 10e9        //Frequency (Hz)
+wind_speed = 350    //Wind speed (km/h)
+c = 3e8         //Speed of light (m/s)
+vr = 1e3          //Differential velocity (m/h)
+
+//Calculations
+wave_lt = c/f   //Wavelength (m)
+freq_shift = 2*(wind_speed*1000/3600)/wave_lt                       //Doppler Frequency shift (Hz)
+T = 1/(2*freq_shift)    //Pulse repetition interval (s)
+prf = 1/T           //Pulse repetition frequency (Hz)
+
+fmin = 2*(vr/3600)/wave_lt  //Frequency resolution (Hz)
+N = 1/((fmin)*T)      //Number of pulses 
+
+//Result
+mprintf("The minimum pulse repetition frequency is %d Hz",prf)
+mprintf("\nThe number of pulses to be sampled is %d", N)
+