{
"metadata": {
"name": "raju chapter3"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Chapter 3:Advanced Radars"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 1, Page no 104"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n# Variable Declaration\nPRF = 1500; # pulse repetitive frequency in Hz\nlamda = 3*10**-2; # wavelength in m;\n\n# Calculations\n# n = 1 gives lowest blind speed\nn=1;\n\nVb = n*(lamda/2)*PRF; # blind speed in m/s\n\n#Result\nprint 'Lowest Blind Speed is',Vb,'m/s';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Lowest Blind Speed is 22.5 m/s\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 2, Page no 105"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math;\n# Variable Declaration\nPRF= 1000; # pulse repetitive frequency in Hz\nFd = 1000; # doppler frequency in Hz;\nF = float(10*10**9); # operating frequency of radar in Hz;\nVo = float(3*10**8); # velocity in m/s\n\n# Calculations\nlamda = Vo/F;\nVa = (Fd*lamda)/2; # speed of automobile in m/s\nVa1 = Va*18/5; # speed of automobile in kmph\n\n# Result\nprint 'Speed of automobile is' ,Va,'m/s', 'or',Va1,'kmph';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Speed of automobile is 15.0 m/s or 54.0 kmph\n"
}
],
"prompt_number": 15
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 3, Page no 105"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n# Variable declaration\nPRF= 1000; # pulse repetitive frequency in Hz\nF = 10*10**9; # operating frequency of radar in Hz;\nVo = 3*10**8; # velocity in m/s\n\n# Calculations\nlamda = Vo/F;\n # Blind Frequency is given by Fn = n*PRF;\nn1 = 1;\nn2 = 2;\nn3 = 3;\nF1 =n1*PRF; # blind frequency for n=1 in Hz; \nF2 =n2*PRF; # blind frequency for n=2 in Hz; \nF3 =n3*PRF; # blind frequency for n=3 in Hz; \n\n# Result\nprint 'Lowest three Blind Frequencies are',F1/1000, 'KHz',F2/1000,'KHz' ,'and',F3/1000,'KHz';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Lowest three Blind Frequencies are 1 KHz 2 KHz and 3 KHz\n"
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 4, Page no 105"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math;\n# Variable declaration\nF = float(10*10**9); # operating frequency in Hz\nPRF= float(800); # pulse repetitive frequency in Hz\nVo = 3*10**8; # velocity in m/s; \nn1 = 1;\nn2 = 2;\nn3 = 3;\n\n# Calculations\n\nlamda = Vo/F; # Wavelength in m\n\n# blind speed Vb = n*(lamda/2)*PRF in m/s\n\nVb1 = n1*(lamda/2)*PRF; #first blind speed in m/s;\nVb2 = n2*(lamda/2)*PRF; #second blind speed in m/s;\nVb3 = n3*(lamda/2)*PRF; #third blind speed in m/s;\n\n#Result\nprint 'First Blind Speed is',Vb1,'m/s'\nprint 'Second Blind Speed is',Vb2,'m/s'\nprint 'Third Blind Speed is',Vb3,'m/s'\nprint 'NOTE: IN TEXT BOOK THIRD BLIND SPEED IS WRONGLY PRINTED AS 48 m/s';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "First Blind Speed is 12.0 m/s\nSecond Blind Speed is 24.0 m/s\nThird Blind Speed is 36.0 m/s\nNOTE: IN TEXT BOOK THIRD BLIND SPEED IS WRONGLY PRINTED AS 48 m/s\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 5,Page No:106"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nF = 10*10**9; #operating frequency in Hz\nVo = 3*10**8; #velocity in m/s; \nVb1 = 20; #lowest(first) blind speed in m/s\nn = 1 ; #since first blindspeed\n\n#Calculations\n\nlamda = Vo/float(F); #Wavelength in m\n\n# blind speed Vb = n*(lamda/2)*PRF in m/s\n\nPRF = (2*Vb1)/float((n*lamda)); #pulse repetitive frequency in Hz\n\n#result\n\nprint'Pulse Repetitive Frequency is %3.2f'%(PRF/1000),'KHz';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Pulse Repetitive Frequency is 1.33 KHz\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6,Page No:106"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable expression\nlamda = 3*10**-2; #wavelength in m\nPRF = 1000; #pulse repetitive frequency in Hz\nVo = 3*10**8; # velocity in m/s\n\n#Calculations\n\nRuamb = (Vo)/float(2*PRF); #max unambiguous range in m\n\n#result\n\nprint'Maximum unambiguous range is %g'%(Ruamb/1000),'Kms';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Maximum unambiguous range is 150 Kms\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7,Page No:106"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nn1 = 1 ; #since first blindspeed\nn3 = 3 ; #since third blindspeed\n\n#Calculations\n\n\n# blind speed Vb1 = n1*(lamda_1/2)*PRF1 in m/s\n# blind speed Vb3 = n3*(lamda-2/2)*PRF2 in m/s\n#here PRF1 = PRF2 = PRF\n#if Vb1=Vb3 then\n#1*(lamda_1/2)*PRF = 3*(lamda_2/2)*PRF\n#lamda_1/lamda_2 = 3/1;\n#lamda = C/F;\n#therefore F1/F2 = 1/3 ;\n\n\n#result\nprint'Ratio of Operating Frequencies of two Radars are (F1/F2) = 1/3';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Ratio of Operating Frequencies of two Radars are (F1/F2) = 1/3\n"
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8,Page No:107"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nVb1 = 20; #first blind speed in m/s\nVb2 = 30; #second blind speed in m/s\nn1 =1 ; #since first blindspeed\nn1 =2 ; #since second blindspeed\nlamda = 3*10**-2; #wavelength in m\n\n#Calculations\n\nPRF1 = (2*Vb2)/float(n1*lamda); #pulse repetitive frequency in Hz of First Radar;\n\nPRF2 = (2*Vb2)/float(n1*lamda); #pulse repetitive frequency in Hz of Second Radar;\n\n\n#result\nprint'Ratio of pulse repetitive frequencies of the Radars is PRF1/PRF2 = %g'%(PRF1/PRF2);\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Ratio of pulse repetitive frequencies of the Radars is PRF1/PRF2 = 1\n"
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 9,Page No:107"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nF = 6*10**9; #operating frequency in Hz\nPRF = 1000; #pulse repetitive frequency in Hz\nVo = 3*10**8; #velocity in m/s; \nn2 = 2; # n value for second blind speed\nn3 = 3; # n value for third blind speed\n\n#Calculations\n\nlamda = Vo/float(F); #Wavelength in m\n\n# blind speed Vb = n*(lamda/2)*PRF in m/s\n\nVb2 = n2*(lamda/float(2))*PRF; #second blind speed in m/s;\nVb21 = Vb2*18/float(5); #second blind speed in kmph; \nVb3 = n3*(lamda/float(2))*PRF; #third blind speed in m/s;\nVb31 = Vb3*18/float(5); #/third blind speed in kmph;\n\n#result\nprint'Second Blind Speed is %g'%Vb21,'kmph';\nprint'Third Blind Speed is %g'%Vb31,'kmph';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Second Blind Speed is 180 kmph\nThird Blind Speed is 270 kmph\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10,Page No:108"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nr = 0.5; #Antenna Radius in m\nf = 8*10**9 #operating frequency in Hz\nVo = 3*10**8; #vel. of EM wave in m/s\nRCS = 5; # Radar cross section in m^2\nD = 1; # antenna diameter in m\nF = 4.77; # noise figure in dB\nRmax = 12*10**3 # Radar range\nBW = 500*10**3; # bandwidth\n\n#Calculation\nF1 = 10**(F/float(10)); # antilog calculation\nlamda = Vo/float(f); # wavelength\n\n#Rmax = 48*((Pt*D^4*RCS)/(BW*lamda*lamda(F-1)))^0.25\n\nPt = ((Rmax/48)**(4))*((BW*lamda*lamda*(F1-1))/float((D**(4)*RCS)))\n\n#result\n\nprint'Peak Transmitted Power is %e'%Pt;\nprint'Note: Calculation error in textbook at Pt 10^12 missing';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Peak Transmitted Power is 1.098173e+12\nNote: Calculation error in textbook at Pt 10^12 missing\n"
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}