initial commit / add all books

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diff --git a/1979/CH11/EX11.1/Ex11_1.sce b/1979/CH11/EX11.1/Ex11_1.sce
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index 000000000..013678474
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@@ -0,0 +1,22 @@
+//chapter-11 page 504 example 11.1

+//==============================================================================

+clc;

+clear;

+

+//For a radar system

+Pt=600000;//peak pulse power in W

+Smin=10^(-13);//minimum detectable signal in W 

+Ae=5;//cross sectional area of the radar antenna in sq m

+w=0.03;//wavelength in m

+s=20;//radar cross sectional area in sq m

+

+//CALCULATION

+Rmax=(((Pt*s*Ae^2)/(4*(%pi)*Smin*w^2))^(1/4))/1000;//Maximum range of a radar system in km

+RMax=Rmax/1.853;//In nautical miles; 1 nm=1.853 km

+

+//OUTPUT

+mprintf('\nMaximum range of a radar system is Rmax=%3.3f km',Rmax);

+disp('In nautical miles; 1 nm=1.853 km');

+mprintf('\nMaximum range of a radar system in nautical miles is RMax=%3.0f nm',RMax);

+

+//=========================END OF PROGRAM===============================

diff --git a/1979/CH11/EX11.2/Ex11_2.sce b/1979/CH11/EX11.2/Ex11_2.sce
new file mode 100755
index 000000000..6ba519ae0
--- /dev/null
+++ b/1979/CH11/EX11.2/Ex11_2.sce
@@ -0,0 +1,22 @@
+//chapter-11 page 504 example 11.2

+//==============================================================================

+clc;

+clear;

+

+//For a radar system

+Pt=250000;//peak transmitted power in W

+G=2500;//power gain of the antenna

+Smin=10^(-14);//minimum detectable signal in W 

+Ae=10;//cross sectional area of the radar antenna in sq m

+f=10*10^9;//frequency of radar in Hz

+s=2;//radar cross sectional area in sq m

+c=3*10^8;//Velocity of light in m/sec

+

+//CALCULATION

+w=c/f;//wavelength in m

+Rmax=(((Pt*G*Ae*s)/(Smin*(4*(%pi))^2))^(1/4))/1000;//Maximum range of a radar system in km

+

+//OUTPUT

+mprintf('\nMaximum range of a radar system is Rmax=%3.2f km',Rmax);

+

+//=========================END OF PROGRAM===============================

diff --git a/1979/CH11/EX11.3/Ex11_3.sce b/1979/CH11/EX11.3/Ex11_3.sce
new file mode 100755
index 000000000..053cf7868
--- /dev/null
+++ b/1979/CH11/EX11.3/Ex11_3.sce
@@ -0,0 +1,22 @@
+//chapter-11 page 504 example 11.3

+//==============================================================================

+clc;

+clear;

+

+//For a marine radar system

+Pt=250000;//peak transmitted power in W

+G=4000;//power gain of the antenna

+R=50000;//maximum range of radar in m

+Pr=10^(-11);//minimum detectable signal in W 

+f=10*10^9;//frequency of radar in H

+c=3*10^8;//Velocity of light in m/sec

+

+//CALCULATION

+w=c/f;//wavelength in m

+Ae=((G*w^2)/(4*(%pi)));//cross sectional area of the radar antenna in sq m

+s=((Pr*(4*(%pi)*R^2)^2)/(Pt*G*Ae));//The cross section of the target the radar can sight in sq m

+

+//OUTPUT

+mprintf('\nThe cross section of the target the radar can sight is s=%2.2f sq m',s);

+

+//=========================END OF PROGRAM===============================

diff --git a/1979/CH11/EX11.4/Ex11_4.sce b/1979/CH11/EX11.4/Ex11_4.sce
new file mode 100755
index 000000000..6cb3c2a3a
--- /dev/null
+++ b/1979/CH11/EX11.4/Ex11_4.sce
@@ -0,0 +1,29 @@
+//chapter-11 page 505 example 11.4

+//==============================================================================

+clc;

+clear;

+

+//For a guided missile tracking radar

+Pt=400000;//transmitted power in W

+prf=1500;//pulse repitition frequency in pps(pulse per sec)

+tw=0.8*10^(-6);//pulse width in sec

+c=3*10^8;//Velocity of light in m/sec

+

+//CALCULATION

+Runamb=(c/(2*prf))/1000;//Unambiguous range in km

+dc=tw/(1/prf);//Duty cycle

+Pav=Pt*dc;//Average power in W

+n1=1;

+BW1=(n1/tw)/10^6;//Suitable BW in MHz for n=1

+n2=1.4;

+BW2=(n2/tw)/10^6;//Suitable BW in MHz for n=1.4

+

+//OUTPUT

+mprintf('\nUnambiguous range is Runamb=%3.0f km \nDuty cycle is dc=%1.4f \nAverage power is Pav=%3.0f W',Runamb,dc,Pav);

+disp('For efficiency n=1,suitable bandwidth in MHz is');

+disp(BW1);

+disp('For efficiency n=1.4,suitable bandwidth in MHz is');

+disp(BW2);

+

+//=========================END OF PROGRAM===============================

+

diff --git a/1979/CH11/EX11.5/Ex11_5.sce b/1979/CH11/EX11.5/Ex11_5.sce
new file mode 100755
index 000000000..938a93d33
--- /dev/null
+++ b/1979/CH11/EX11.5/Ex11_5.sce
@@ -0,0 +1,23 @@
+//chapter-11 page 505 example 11.5

+//==============================================================================

+clc;

+clear;

+

+//For a military radar

+Pt=2500000;//power output in W

+f=5*10^9;//frequency of radar in H

+c=3*10^8;//Velocity of light in m/sec

+D=5;//antenna diameter in m

+B=1.6*10^6;//receiver bandwidth in Hz

+s=1;//radar cross sectional area in sq m

+NF=12;//noise figure in dB

+

+//CALCULATION

+w=c/f;//wavelength in m

+F=10^(NF/10);//noise figure

+Rmax=(48*((Pt*s*D^4)/(B*(F-1)*w^2))^(1/4));//Maximum detection range in km

+

+//OUTPUT

+mprintf('\nMaximum detection range of a radar is Rmax=%3.0f km',Rmax);

+

+//=========================END OF PROGRAM===============================

diff --git a/1979/CH11/EX11.6/Ex11_6.sce b/1979/CH11/EX11.6/Ex11_6.sce
new file mode 100755
index 000000000..06630ef71
--- /dev/null
+++ b/1979/CH11/EX11.6/Ex11_6.sce
@@ -0,0 +1,17 @@
+//chapter-11 page 506 example 11.6 

+//==============================================================================

+clc;

+clear;

+

+//For a civilian radar

+Rmax=30;//maximum range in kms

+x=50;

+y=2;

+disp('Maximum range with an equivalent echoing area of 50 times in kms is');

+R=Rmax*x^(1/4);

+disp(R);

+disp('Range would be increased if Tx power is doubled by a factor of');

+f=y^(1/4);

+disp(f);

+

+//=========================END OF PROGRAM===============================