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{
"metadata": {
"name": "",
"signature": "sha256:358c1b86e82f27b9eee799b4793457200c3f930f370a7e7347103331d9245d4d"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13 Wave Propagation"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.1 Page no 628"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"x=(2*(1/2.0))\n",
"a=15\n",
"d=53.5*10**-6 #duration for each horizontal line on the reciever\n",
"t=1/186000.0 #time delay between direct and reflected signal\n",
"\n",
"#calculation\n",
"g=(t/d)*a #ghost width\n",
"\n",
"#result\n",
"print\"ghost width = \",round(g,2),\"in.\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"ghost width = 1.51 in.\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.2 Page no 641"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"S=83 #satellite longitude in degrees\n",
"N=90 #site longitude in degrees\n",
"L=35 #site longitude in degrees\n",
"\n",
"#calculation\n",
"import math\n",
"b=0.1512 #constant in equation\n",
"A=180+math.atan(math.tan(-7*3.14/180)/math.sin(35*3.14/180))*180/3.14 \n",
"E=math.atan((math.cos((S-N)*3.14/180)*math.cos(L*3.14/180)-b)/math.sqrt(1-((math.cos(L*3.14/180))**2*(math.cos((S-N)*3.14/180))**2)))*180/3.14\n",
"\n",
"#Result\n",
"print\"The azimuth is equal to A = \",round(A,0),\"degree\"\n",
"print\"the elevation angle = \",round(E,1),\"degree\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The azimuth is equal to A = 168.0 degree\n",
"the elevation angle = 48.7 degree\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.3 Page no 646"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"import math\n",
"x=(32+(44/60.0)+(36/3600.0)) # N latitude\n",
"y=(106+(16/60.0)+(37/3600.0)) #W longitude\n",
"D=42.1642*10**6 #distance from the satellite to the center of the earth\n",
"R=6.378*10**6 #earth's radius\n",
"a=32.74333*3.14/180.0 #in degree\n",
"B=-7.27694*3.14/180.0 #in degree\n",
"\n",
"#calculation\n",
"q=math.cos(a)*math.cos(B)\n",
"\n",
"d=math.sqrt(D**2+R**2-(2*D*R*q))\n",
"c=2.997925*10**5 #velocity of light\n",
"de=d/c\n",
"rd=(2*d)/c\n",
"\n",
"#result\n",
"print\"N longitude converted into degrees = \",round(x,2)\n",
"print\"W longitude coverted into degrees =\",round(y,2)\n",
"print\"distance = \",round(d/1000,1),\"*10**6 meters\"\n",
"print\"delay =\",round(de/1000,3),\"seconds\"\n",
"print\"roundtrip delay = \",round(rd/1000,3),\"seconds\" \n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"N longitude converted into degrees = 32.74\n",
"W longitude coverted into degrees = 106.28\n",
"distance = 37009.1 *10**6 meters\n",
"delay = 0.123 seconds\n",
"roundtrip delay = 0.247 seconds\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.4 Page no 651"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"G=45 #antenna gain\n",
"nt=25 #antenna noise temperature\n",
"nt1=70 #LNB noise temperature\n",
"nt2=2 #noise temperature(reciever and passive components)\n",
"\n",
"#calculation\n",
"import math\n",
"T=nt+nt1+nt2 #total noise temperature\n",
"x=G-10*math.log10(T) #figure of merit\n",
"\n",
"#result\n",
"print\"Sum of all of the noise temperature contributions Ts = \",T,\"k\"\n",
"print\"The figure of merit = \",round(x,2),\"dB\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Sum of all of the noise temperature contributions Ts = 97 k\n",
"The figure of merit = 25.13 dB\n"
]
}
],
"prompt_number": 19
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.5 Page no 652"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"d=41.130383*10**6 #dismath.tance\n",
"c=2.997925*10**8 #velocity of light\n",
"f=14.25*10**9 #uplink frequency\n",
"\n",
"#calculation\n",
"import math\n",
"h=c/f #wavelength\n",
"x=(4*math.pi*d)/h\n",
"Lp=20*math.log10(x) #free-space path loss\n",
"\n",
"#result\n",
"print\"The wavelength is= \",round(h,2)\n",
"print\"Lp(dB)= \",round(Lp,2),\"dB\"\n",
"#INcorrect answer of h in the textbook"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The wavelength is= 0.02\n",
"Lp(dB)= 207.81 dB\n"
]
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
