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diff --git a/Electronic_Communication_Systems_by_Roy_Blake/Chapter20.ipynb b/Electronic_Communication_Systems_by_Roy_Blake/Chapter20.ipynb new file mode 100644 index 00000000..7a56204a --- /dev/null +++ b/Electronic_Communication_Systems_by_Roy_Blake/Chapter20.ipynb @@ -0,0 +1,434 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 20 : Satellite Communication" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 1 : pg 754" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "A) The velocity of a satellite is 7613.87 m/s\n", + "The orbital period of satellite is 5694.08 sec\n", + "B) The velocity of a satellite is 3071.48 m/s\n", + "The orbital period of satellite is 86735.85 sec\n" + ] + } + ], + "source": [ + " \n", + "# page no 754\n", + "# prob no 20.1\n", + "# part A)\n", + "from math import pi, sqrt\n", + "#calculate the velocity and orbital period of satellite in both cases\n", + "#given\n", + "d=500.;\n", + "#calculations and results\n", + "#By using the equation for velocity of a satellite\n", + "v=sqrt(4*10**11/(d+6400));\n", + "print 'A) The velocity of a satellite is',round(v,2),'m/s'\n", + "# The radius of orbit is \n", + "r=(6400+d)*10**3#in m\n", + "#The orbital period of satellite is\n", + "T=(2*pi*r)/v;\n", + "print 'The orbital period of satellite is',round(T,2),'sec'\n", + "#part B)\n", + "d=36000.;\n", + "#By using the equation for velocity of a satellite\n", + "v=sqrt(4*10**11/(d+6400));\n", + "print 'B) The velocity of a satellite is',round(v,2),'m/s'\n", + "#The radius of orbit is \n", + "r=(6400+d)*10**3#in m\n", + "#The orbital period of satellite is\n", + "T=(2*pi*r)/v;\n", + "print 'The orbital period of satellite is',round(T,2),'sec'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 2 : pg 757" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "required angle is 6.8137529672 degrees\n" + ] + } + ], + "source": [ + " \n", + "# page no 757\n", + "# prob no 20.2\n", + "#calculate the required angle\n", + "#given\n", + "from math import atan, cos, sin, pi\n", + "R = 6400.#Radius of earth\n", + "L = 45.#earth station lattitude\n", + "H = 36000.#Height of satellite above the earth;\n", + "#calculations\n", + "ang = atan((6400. * sin(L * pi / 180.)) / (36000 + (6400 * (1 - cos(L * pi / 180.))))) * 180 / pi\n", + "#results\n", + "print \"required angle is \",ang, \"degrees\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 3 : pg 758" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The length of the path is 38836.175 km\n" + ] + } + ], + "source": [ + " \n", + "# page no 758\n", + "# prob no 20.3\n", + "#calculate the length of the path\n", + "#given\n", + "from math import sqrt, sin, cos, pi\n", + "#Determination of lenght of geostationary satellite with angle of elavation=30\n", + "#degree\n", + "r = 64. * 10 ** 5#Radius of earth\n", + "h = 36. * 10 ** 6#height of satellite\n", + "theta = 30 * pi / 180.#angle of elevation\n", + "#calculations\n", + "d = sqrt(((r + h) ** 2) - ((r * cos(theta)) ** 2)) - (r * sin(theta))\n", + "#results\n", + "print 'The length of the path is',round(d / 1000,3),'km'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 4 : pg 759" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The value of signal strength at receiver -88.071 dBm\n" + ] + } + ], + "source": [ + " \n", + "# page no 759\n", + "# prob no 20.4\n", + "#calculate the value of signal strength\n", + "#given\n", + "from math import log10\n", + "#A satellite transmitter operates at 4GHz with 7W & antenna gain 40dBi\n", + "#Receiver antenna gain 30dBi & path length is 4*10**7\n", + "Gt_dBi = 40.\n", + "Gr_dBi = 30.\n", + "Pt = 7\n", + "d = 40000.#in km\n", + "f = 4000.#in MHz\n", + "#calculations\n", + "Pr_Pt_dB = Gt_dBi + Gr_dBi - (32.44 + (20 * log10(d)) + (20 * log10(f)))\n", + "#Signal strength at transmitter\n", + "Pt_dBm = 10 * log10(Pt / 10 ** -3)\n", + "Pr_dBm = (Pt_dBm) + (Pr_Pt_dB)\n", + "#results\n", + "print 'The value of signal strength at receiver',round(Pr_dBm,3),'dBm'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 5 : pg 760" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The receiver noise temperature is 21.013 dB\n" + ] + } + ], + "source": [ + " \n", + "# page no 760\n", + "# prob no 20.5\n", + "#calculate the receiver\n", + "#given\n", + "from math import log10\n", + "# In the given problem\n", + "G = 40# receiving antenna gain\n", + "T_sky = 15.# noise temp\n", + "L = 0.4#loss between antenna and LNA input\n", + "T_eq = 40.# noise temperature f LNA\n", + "#calculations\n", + "# Fir-st we have to find G in dB\n", + "G_dB = G - L\n", + "# For the calculation of T, we have to convert the feedhorn loss into a ratio\n", + "# as follows\n", + "L = 10 ** (0.4 / 10)\n", + "Ta = ((L - 1) * 290. + T_sky) / L\n", + "# The receiver noise temperature is given wrt the chosen reference\n", + "# point,theefore\n", + "Ratio = G - 10 * log10(Ta + T_eq)\n", + "#results\n", + "print 'The receiver noise temperature is',round(Ratio,3),'dB'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 6 : pg 761" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Equivalent noise temperature is 119.64 K\n" + ] + } + ], + "source": [ + " \n", + "# page no 761\n", + "# prob no 20.6\n", + "#calculate the equivalent noise temperature\n", + "#given\n", + "NF_dB=1.5;# noise fig of a receiver\n", + "#calculations\n", + "NF=10**(NF_dB/10);\n", + "# Equivalent noise temperature is giveb as\n", + "T_eq=290*(NF-1);\n", + "#results\n", + "print 'Equivalent noise temperature is',round(T_eq,2),'K'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 7 : pg 761" + ] + }, + { + "cell_type": "code", + "execution_count": 7, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The carrier to noise ratio at the receiver is 30.97 dB\n" + ] + } + ], + "source": [ + " \n", + "# page no 761\n", + "# prob no 20.7\n", + "#calculate the carrier to noise ratio\n", + "#given\n", + "from math import log10\n", + "# refer prob no 20.5\n", + "d=38000.;#distance of satellite from the Earth surface\n", + "P=50.;#transmitter power\n", + "G=30.;#antenna gain\n", + "f=12000.;#frequency in MHz\n", + "B=10**6;# Bandwidth in MHz\n", + "#from problem no 2.5\n", + "G_T=21;\n", + "L_misc=0;\n", + "k_dBW=-228.6;#Boltzmann's constant in dBW\n", + "#calculations\n", + "# There are no miscellaneous loss\n", + "#The stellite transmitting power in dBW is \n", + "Pt_dBW = 10*log10(P);\n", + "# The EIPR in dBW \n", + "EIRP_dBW=Pt_dBW + G;\n", + "#FSL in dB\n", + "FSL_dB= 32.44 + (20*log10(d)) + (20*log10(f));\n", + "# The carrier to noise ratio is\n", + "ratio=EIRP_dBW - FSL_dB - L_misc + G_T - k_dBW - 10*log10(B);\n", + "#results\n", + "print 'The carrier to noise ratio at the receiver is',round(ratio,2),'dB'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 8 : pg 762" + ] + }, + { + "cell_type": "code", + "execution_count": 8, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The total time delay is 0.000533 sec\n" + ] + } + ], + "source": [ + " \n", + "# page no 762\n", + "# prob no 20.8\n", + "#calculate the total time delay\n", + "#given\n", + "D=40000.;# distance of satellite from the earth station\n", + "v=3*10**8;# velo of light\n", + "d=80000.;# distance between two earth stations\n", + "#calculations\n", + "# time delay is given as\n", + "t=d/v;\n", + "# total time delay will be twice that of calculated above\n", + "T=2*t;\n", + "#results\n", + "print 'The total time delay is ',round(T,6),'sec'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 9 : pg 769" + ] + }, + { + "cell_type": "code", + "execution_count": 9, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The gain of TVRO is 39.39 dB\n", + "The beamwidth is 1.75 degree\n" + ] + } + ], + "source": [ + " \n", + "# page no 769\n", + "# prob no 20.9\n", + "#calculate the gain and beamwidth\n", + "#given\n", + "from math import pi, log10\n", + "f_down = 4*10**9;# downlink freq\n", + "D=3.;#diameter\n", + "n=0.55;#efficiency\n", + "c=3.*10**8;#velo of light\n", + "#calculations\n", + "# The gain of a parabolic antenna is given as G=(n*%pi**2*D**2)/wl**2. Therefore wavelength is given as\n", + "wl=c/f_down\n", + "G=(n*pi**2*D**2)/wl**2;\n", + "G_dB = 10*log10(G);\n", + "# The beamwidth is given as\n", + "bw= (70*wl)/D;\n", + "#results\n", + "print 'The gain of TVRO is ',round(G_dB,2),'dB'\n", + "print 'The beamwidth is',round(bw,2),'degree'" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.11" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |