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TABLE 1.1
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Frequency Band Designations Band designation VHF UHF L S C X Ku K Ka V W mm m
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Frequency range, (GHz) 0.1 0.3 0.3 1.0 1.0 2.0 2.0 4.0 4.0 8.0 8.0 12.0 12.0 18.0 18.0 27.0 27.0 40.0 40.0 75 75 110 110 300 300 3000
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TABLE 1.2
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ITU Frequency Band Designations Frequency range (lower limit exclusive, upper limit inclusive) 3 30 kHz 30 300 kHz 300 3000 kHz 3 30 MHz 30 300 MHz 300 3000 MHz 3 30 GHz 30 300 GHz 300 3000 GHz Corresponding metric subdivision Myriametric waves Kilometric waves Hectometric waves Decametric waves Metric waves Decimetric waves Centimetric waves Millimetric waves Decimillimetric waves Metric abbreviations for the bands B.Mam B.km B.hm B.dam B.m B.dm B.cm B.mm
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Band number 4 5 6 7 8 9 10 11 12
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Symbols VLF LF MF HF VHF UHF SHF EHF
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ITU Geneva.
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The official ITU frequency band designations are shown in Table 1.2 for completeness. However, in this text the designations given in Table 1.1 will be used, along with 6/4 GHz for the C band and 14/12 GHz for the Ku band. 1.3 INTELSAT INTELSAT stands for International Telecommunications Satellite. The organization was created in 1964 and currently has over 140 member countries and more than 40 investing entities (see http://www.intelsat.com/ for more details). In July 2001 INTELSAT became a private company and in May 2002 the company began providing end-to-end solutions through a network of teleports, leased fiber, and points of presence (PoPs) around the globe. Starting with the Early Bird satellite in 1965, a succession of satellites has been launched at intervals of a few years. Figure 1.1 illustrates the evolution of some of the INTELSAT satellites. As the figure shows, the capacity, in terms of number of voice channels, increased dramatically with each succeeding launch, as well as the design lifetime. These satellites are in geostationary orbit, meaning that they appear to be stationary in relation to the earth. The geostationary orbit is the topic of Chap. 3. At this point it may be noted that geostationary satellites orbit in the earth s equatorial plane and their position is specified by their longitude. For international traffic, INTELSAT covers three main regions the Atlantic Ocean Region (AOR), the Indian Ocean Region (IOR), and the Pacific Ocean Region (POR) and what is termed Intelsat America s Region. For the ocean regions the satellites are positioned in geostationary orbit above the particular ocean, where they provide a transoceanic telecommunications route. For example, INTELSAT satellite 905 is positioned at 335.5 east longitude. The footprints for the C-band antennas are shown in Fig. 1.2a, and for the Kuband spot beam antennas in Figs. 1.2b and c.
Evolution of INTELSAT satellites. (From Colino 1985; courtesy of ITU Telecommunications Journal.)
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10 5 0
INTELSAT satellite 905 is positioned at 335.5 E longitude. (a) The footprints for the C-band antennas; (b) the Ku-band spot 1 beam antennas; and (c) the Ku-band spot 2 beam antennas.
Overview of Satellite Systems
(Continued).
The INTELSAT VII-VII/A series was launched over a period from October 1993 to June 1996. The construction is similar to that for the V and VA/VB series, shown in Fig. 1.1, in that the VII series has solar sails rather than a cylindrical body. This type of construction is described in more detail in Chap. 7. The VII series was planned for service in the POR and also for some of the less demanding services in the AOR. The antenna beam coverage is appropriate for that of the POR. Figure 1.3 shows the antenna beam footprints for the C-band hemispheric coverage and zone coverage, as well as the spot beam coverage possible with the Ku-band antennas (Lilly, 1990; Sachdev et al., 1990). When used in the AOR, the VII series satellite is inverted north for south (Lilly, 1990), minor adjustments then being needed only to optimize the antenna patterns for this region. The lifetime of these satellites ranges from 10 to 15 years depending on the launch vehicle. Recent figures from the INTELSAT Web site give the capacity for the INTELSAT VII as 18,000 two-way telephone circuits and three TV channels; up to 90,000 two-way telephone circuits can be achieved with the use of digital circuit multiplication. The INTELSAT VII/A has a capacity of 22,500 two-way telephone circuits and three TV channels; up to 112,500 two-way telephone circuits can be achieved with the use of digital circuit multiplication. As of May 1999, four satellites were in service over the AOR, one in the IOR, and two in the POR.
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