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3.12. Referring to Prob. 3.11, verify that the geostationary arc required for CONUS plus Hawaii is 85 to 136 W and for CONUS plus Alaska is 115 to 136 W. 3.13. By taking the Mississippi River as the dividing line between east and west, verify that the western region of the United States would be covered by satellites in the geostationary arc from 136 to 163 W and the eastern region by 25 to 55 W. Assume a 5 angle of elevation. 3.14. (a) An earth station is located at latitude 35 N. Assuming a polar mount antenna is used, calculate the angle of tilt. (b) Would the result apply to polar mounts used at the earth stations specified in Probs. 3.6 and 3.8 3.15. Repeat Prob. 3.14 (a) for an earth station located at latitude 12 S. Would the result apply to a polar mount used at the earth station specified in Prob. 3.7 3.16. Repeat Prob. 3.14 (a) for an earth station located at latitude 30 S. Would the result apply to a polar mount used at the earth station specified in Prob. 3.9 3.17. Calculate the angle of tilt required for a polar mount antenna used at your home location. 3.18. The borders of a certain country can be roughly represented by a triangle with coordinates 39 E, 33.5 N; 43.5 E, 37.5 N; 48.5 E, 30 N. If a geostationary satellite has to be visible from any point in the country, determine the limits of visibility (i.e., the limiting longitudinal positions for a satellite on the geostationary arc). Assume a minimum angle of elevation for the earth station antenna of 5 , and show which geographic location fixes which limit. 3.19. Explain what is meant by the earth eclipse of an earth-orbiting satellite. Why is it preferable to operate with a satellite positioned west, rather than east, of earth station longitude 3.20. 3.21. 904. 3.22. 3.23. Explain briefly what is meant by sun transit outage. Using the data given in Fig. 3.7, calculate the longitude for INTELSAT
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Calculate the semimajor axis for INTELSAT 901. Calculate the apogee and perigee heights for INTELSAT 906.
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3.24. Calculate the rate of regression of the nodes and the rate of rotation of the line of apsides for INTELSAT 907.
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References
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Bate, R. R., D. D. Mueller, and J. E. White. 1971. Fundamentals of Astrodynamics. Dover, New York. Celestrak, at http://celestrak.com/NORAD/elements/intelsat.txt Mahon, J., and J. Wild. 1984. Commercial Launch Vehicles and Upper Stages. Space Commun. Broadcast., Vol. 2, pp. 339 362. Maral, G., and M. Bousquet. 1998. Satellite Communications Systems. Wiley, New York. Spilker, J. J. 1977. Digital Communications by Satellite. Prentice-Hall, Englewood Cliffs, NJ. Wertz, J. R. (ed.). 1984. Spacecraft Attitude Determination and Control. D. Reidel, Holland.
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4.1 Introduction A signal traveling between an earth station and a satellite must pass through the earth s atmosphere, including the ionosphere, as shown in Fig. 4.1, and this can introduce certain impairments, which are summarized in Table 4.1. Some of the more important of these impairments will be described in this chapter. 4.2 Atmospheric Losses Losses occur in the earth s atmosphere as a result of energy absorption by the atmospheric gases. These losses are treated quite separately from those which result from adverse weather conditions, which of course are also atmospheric losses. To distinguish between these, the weather-related losses are referred to as atmospheric attenuation and the absorption losses simply as atmospheric absorption. The atmospheric absorption loss varies with frequency, as shown in Fig. 4.2. The figure is based on statistical data (CCIR Report 719-1, 1982). Two absorption peaks will be observed, the first one at a frequency of 22.3 GHz, resulting from resonance absorption in water vapor (H2O), and the second one at 60 GHz, resulting from resonance absorption in oxygen (O2). However, at frequencies well clear of these peaks, the absorption is quite low. The graph in Fig. 4.2 is for vertical incidence, that is, for an elevation angle of 90 at the earth-station antenna. Denoting this value of absorption loss as [AA]90 decibels, then for elevation angles down to 10 , an approximate formula for the absorption loss in decibels is (CCIR Report 719-1, 1982) [AA] [AA]90 cosecEl (4.1)
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