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two 12 meter, L-band antennas (large umbrellalike structures) that generate 140 spot beams. On-board digital switching is provided which routes calls between beams. Subscribers are provided with a dual-mode phone that can be switched between satellite and the GSM modes of operation. Services include voice telephony, Internet connectivity, data, and alerting and paging. The mobile links operate at frequencies in the L-band (uplink 1625.5 1660.5 MHz; downlink 1525 1559 MHz), and the gateway frequencies are in the C-band (uplink 6.425 6.725 GHz; downlink 3.400 3.700 GHz). The gateway terminals provide access to the national telephone networks. A second satellite will be employed to expand the service into western and central Asia, Europe, and northern Africa. Further information can be obtained from the Web site at http://www.acesinternational.com/corporate/index.php
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The Thuraya satellite system has geosynchronous satellites located at 44 and 28.5 E longitude, at an inclination of 6.3 , again presumably to dispense with N-S station-keeping maneuvers as described in Sec. 7.5. The first Thuraya satellite was launched on October 21, 2000, and the second on June 10, 2003. A third satellite is being built to increase the system capacity. The Thuraya satellite system serves an area between about 20 W to 100 E longitude and 60 N to 2 S latitude, covering more than 110 countries with a combined population of 2.3 billion. The footprint spans Europe, North, Central Africa, and large parts of Southern Africa. A 12.25 16 m elliptical antenna is employed providing 250 to 300 spot beams, with onboard beam-switching. An uplink beacon signal provides beam adjustment to compensate for the nongeostationary path of the satellites. The system operates with a 10-dB fade margin to allow for shadowing of handheld units. The network capacity is about 13,750 telephone channels. Quaternary phase-shift keying modulation is used, with frequency-division multiple access (FDMA)/time-division multiple access (TDMA). Dual-mode handsets are used that can be switched between GSM mode and satellite mode. Service features include voice telephony, fax, data, short messaging, location determination, emergency services, and high-power alerting. The mobile links operate at frequencies in the L-band (uplink 1625.5 1660.5 MHz; downlink 1525 1559 MHz), and the gateway frequencies are in the C band (uplink 6.425 6.725 GHz; downlink 3.400 3.700 GHz). Further information can be obtained from the Web site at http://www.thuraya.com/ This system has two geostationary satellites, MSAT-1 and MSAT-2, which provide services across North and Central America, northern South America, the Caribbean, Hawaii, and in coastal waters. The system is operated by Mobile Satellite Ventures (MSV), which has
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offices in Reston, VA, and in Ottawa, Ontario, Canada. A variety of services are offered, including tracking and managing trucking fleets, wireless phone, data and fax, dispatch radio services, and differential GPS. L-band frequencies are used for the satellite services, the downlink band being 1530 to 1559 MHz, and the uplink, 1631.5 to 1660.5 MHz. The feeder links to the ground segment (which connects with public and private telephone and data networks) are in the Ku band, the downlink band being 10.75 to 10.95 GHz and the uplink 13.0 to 13.15 GHz and also 13.2 to 13.25 GHz. Two transponders are used for the Ku-band to L-band forward link, and one transponder is used for the L-band to Ku-band return link. Power output for the L-band is 600 W. Two L-band mesh reflector antennas, 5.7m 4.7m are used to give an EIRP of 57.3 dBW at the edge of the service area. Power output for the Ku band is 110 W. Satellite operation and maintenance is carried out by Telesat Canada. Further information can be obtained from the Web site at http://www.msvlp.com/ 17.3 VSATs VSAT stands for very small aperture terminal system. This is the distinguishing feature of a VSAT system, the earth-station antennas being typically less than 2.4 m in diameter (Rana et al., 1990). The trend is toward even smaller dishes, not more than 1.5 m in diameter (Hughes et al., 1993). In this sense, the small TVRO terminals described in Sec. 16.9 for direct broadcast satellites could be labeled as VSATs, but the appellation is usually reserved for private networks, mostly providing two-way communications facilities. Typical user groups include banking and financial institutions, airline and hotel booking agencies, and large retail stores with geographically dispersed outlets. The basic structure of a VSAT network consists of a hub station which provides a broadcast facility to all the VSATs in the network and the VSATs themselves which access the satellite in some form of multipleaccess mode. The hub station is operated by the service provider, and it may be shared among a number of users, but of course, each user organization has exclusive access to its own VSAT network. Time division multiplex is the normal downlink mode of transmission from hub to the VSATs, and the transmission can be broadcast for reception by all the VSATs in a network, or address coding can be used to direct messages to selected VSATs. Access the other way, from the VSATs to the hub, is more complicated, and a number of different methods are in use, many of them proprietary. A comprehensive summary of methods is given in Rana et al. (1990). The most popular access method is FDMA, which allows the use of comparatively low-power VSAT terminals (see Sec. 14.7.12). TDMA also can be
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