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{
"metadata": {
"name": "",
"signature": "sha256:3889f080e541059ccdb3a0ca28e3a8926a614c5d9e6ab3f2de315570240fb716"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4: Radio Wave Propagation"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.1, Page 97"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#Variable Declaration\n",
"\n",
"El=50 #Elevation Angle(degrees)\n",
"h0=0.6 #Earth station altitude(km)\n",
"hr=3 #Rain height(km)\n",
"R01=10 #Point Rain Rate(mm/hr)\n",
"f=12 #frequency(GHz)\n",
"ah=0.0188\n",
"bh=1.217\n",
"av=0.0168\n",
"bv=1.2\n",
"#Calculation\n",
"Ls=(hr-h0)/math.sin(El*3.142/180) #Slant path length(km)\n",
"LG=Ls*math.cos(El*3.142/180) #Horizontal projection(km)\n",
"r01=90/(90+4*LG) #Reduction factor\n",
"L=Ls*r01 #Effective path length(km)\n",
"alphah=ah*R01**bh #Specific Attenuation\n",
"AdBh=round(alphah*L,2)#Rain Attenuation for horizontal polarization\n",
"alphav=av*R01**bv #Specific Attenuation\n",
"AdBv=round(alphav*L,2)#Rain Attenuation for vertical polarization\n",
"\n",
"#Results\n",
"\n",
"print\"Rain Attenuation for given conditions and horizontal polarization is\",AdBh,\"dB\"\n",
"print\"Rain Attenuation for given conditions and vertical polarization is\",AdBv,\"dB\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Rain Attenuation for given conditions and horizontal polarization is 0.89 dB\n",
"Rain Attenuation for given conditions and vertical polarization is 0.77 dB\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.2, Page 99"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#Variable Declaration\n",
"ah=0.0188\n",
"bh=1.217\n",
"av=0.0168\n",
"bv=1.2\n",
"R01=10 #Point Rain Rate(mm/hr)\n",
"L=2.8753812 #Effective path length calculated in Example 4.1(km)\n",
"\n",
"#Calculation\n",
"\n",
"#Factors depending on frequency and polarization\n",
"ac=(ah+av)/2 #a for circular polarization\n",
"bc=(ah*bh+av*bv)/(2*ac) #b for circular polarization\n",
"\n",
"alpha=ac*R01**bc #Specific Attenuation(dB)\n",
"AdB=round(alpha*L,2) #Rain Attenuation(dB)\n",
"\n",
"\n",
"#Results\n",
"\n",
"print \"The Rain Attenuation for circular polarization is\",AdB,\"dB\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The Rain Attenuation for circular polarization is 0.83 dB\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
