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XTAR, LLC is a commercial satellite operator exclusively providing services in the X band frequency range, which is the communications cornerstone of today's military, diplomatic, humanitarian and emergency disaster response operations. A privately owned and operated company,〔(【引用サイトリンク】url=http://www.loral.com/ )〕 XTAR supports the critical satellite communications needs of governments around the world through its two X-band payloads. The XTAR satellites were designed and built by private financing. Loral Space & Communications, Inc. owns the majority share. It currently operates from Herndon, VA. With its high-powered 72 MHz transponders and global, fixed and steerable beams, XTAR provides over 4 GB of secure X-band capacity with coverage from Denver east to Singapore. The system can accommodate massive wideband data requirements and provides overlapping coverage with regional redundancy for increased service and reliability. XTAR bandwidth is not application-specific; it can support and transmit to any one of the primary architectures used by government agencies today, including fixed-to-fixed, tactical-to-tactical, reach-back, broadcast and airborne platforms. == Satellite Fleet == The XTAR fleet uses the hosted payload model, an application that is becoming increasingly used by U.S. and other governments.〔(【引用サイトリンク】url=http://www.space.commerce.gov/general/commercialpurchase/hostedpayloads.shtml )〕 XTAR-EUR hosts a payload and XTAR-LANT is a hosted payload. XTAR-EUR, at 29 degrees East longitude, began operations in February 2005.〔(【引用サイトリンク】url=http://www.satbeams.com/satellites?norad=28542 )〕 Fully owned and operated by XTAR, the XTAR-EUR satellite hosts a NATO-configurable payload designed to support an anchor European customer. The coverage area includes Eastern Brazil and the Atlantic Ocean, Europe, Africa, the Middle East, and Southeast Asia as far east as Singapore. XTAR-LANT, at 30 degrees West longitude, was placed into orbit in 2006.〔(【引用サイトリンク】url=http://www.satbeams.com/satellites?norad=28945 )〕 It is a hosted payload on the SPAINSAT satellite located. The coverage area includes North America, South America, Europe, Africa, and the Atlantic Ocean. Both satellites are built on the Space Systems/Loral modular platform (1300 spacecraft ) designed for 18-plus years of on-orbit operation. The spacecraft attitude maintained to within 0.02° in roll, pitch, and yaw. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XTAR」の詳細全文を読む スポンサード リンク
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