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thumb The Joint Tactical Radio System (JTRS) was planned to be the next-generation voice-and-data radio used by the U.S. military in field operations. However, the project was cancelled in October 2011 by the United States Undersecretary of Defense for Acquisition, Technology & Logistics, who stated that: : ''Our assessment is that it is unlikely that products resulting from the JTRS GMR development program will affordably meet Service requirements, and may not meet some requirements at all. Therefore, termination of the program is necessary.''〔US Undersecretary of Defense Frank Kendall's letter to the United States Senate Committee on Armed Services, sent October 13, 2011 http://assets.fiercemarkets.com/public/sites/govit/jtrs_kendall_letter.pdf '〕 The funding for the project was allowed to expire in March 2012. ==Overview== Launched with a Mission Needs Statement in 1997 and a subsequent requirements document in 1998 (which was revised several times), JTRS was a family of software-defined radios that were to work with many existing military and civilian radios. It included integrated encryption and Wideband Networking Software to create mobile ad hoc networks (MANETs). The JTRS program was beset by delays and cost overruns, particularly Ground Mobile Radios (GMR), run by Boeing.〔(The Joint Tactical Radio System (JTRS) and the Army’s Future Combat System (FCS): Issues for Congress, November 17, 2005 )〕 Problems included a decentralized management structure, changing requirements, and unexpected technical difficulties that increased size and weight goals that made it harder to add the required waveforms. The JTRS was built on the Software Communications Architecture (SCA), an open-architecture framework that tells designers how hardware and software are to operate in harmony. It governs the structure and operation of the JTRS, enabling programmable radios to load waveforms, run applications, and be networked into an integrated system. A Core Framework, providing a standard operating environment, must be implemented on every hardware set. Interoperability among radio sets was increased because the same waveform software can be easily ported to all radios. The Object Management Group (OMG), a not-for-profit consortium that produces and maintains computer industry specifications for interoperable enterprise applications, is working toward building an international commercial standard based on the SCA. 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「Joint Tactical Radio System」の詳細全文を読む スポンサード リンク
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