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GLONASS-K2 is the next satellite design intended as a part of the Russian GLONASS radio-based satellite navigation system. Developed by Reshetnev Information Satellite Systems has an expected launch debut in 2018 with an expected production period of ten years. It is an evolution of the previous GLONASS-K third-generation satellites, adding CDMA signals, improving accuracy and increasing power. It is 70% heavier and has 170% more power.〔 == History == (詳細はRussian Federal Space Agency (Roscosmos) initially ordered 27 GLONASS-K satellites from Reshetnev Information Satellite Systems, the developer of all the previous GLONASS satellites.〔 On 7 December 2010, the company announced it had completed ground tests of the first GLONASS-K1 development satellite.〔 The satellite was launched to orbit on 26 February 2011 as Kosmos 2471.〔 On November 30, 2014, the second and supposedly last GLONASS-K1 development satellite was put to orbit as Kosmos 2501.〔 On a May 28, 2014 interview, Nikolay Testoyedov — president of ISS Reshetnev — stated that production of GLONASS-M would end in 2015, with GLONASS-K being exclusively produced after that final batch.〔 In an December 14, 2014 interview with GPS World, he stated that while the original idea was to have just two GLONASS-K1 prototypes to be followed by the GLONASS-K2 production, the Western sanctions limited the supply of radiation resistant electronics. And thus, they had decided to launch an additional nine GLONASS-K1 as fleet replacement while they finished the GLONASS-K2 design. 〔 In a May, 2015 presentation, Mr. Testoyedov expected the serial production of GLONASS-K1 to start flying in early 2018, just after the launch of the first GLONASS-K2 prototype. The presentation showed at least eleven additional GLONASS-K1 satellites flying until 2020.〔 In April 2, 2015 he affirmed that the first GLONASS-K2 prototype was expected to fly in 2018 and feature COSPAS-SARSAT compatible equipment.〔 On May 21, 2015 during an interview with Izvestia, JSC “Russian Space Systems” CEO, Andrew Tyulina, stated that the new GLONASS-K2 were expected to use Russian radiation-hardened components. Given the sanctions that banned the transfer of ITAR controlled parts, the Russian industry had been ordered to initiate an import substitution program. In the case of the GLONASS-K1, the foreign components were up to 90% of the electronics. And thus without substitution the modernization program could not make modern spacecrafts. He stated that the first generation of GLONASS spacecraft were created under such a ban and thus had been an inferior product with just 3 years of expected life. A situation that was not acceptable now.〔 During May 27 and 28, 2015, in Dubna, Moscow region, ISS Reshetnev held a Council on electronic components. They specifically worked out a plan with JSC “Russian Space Systems on provisioning of high-quality electronic components in compliance with the state-run import substitution programs.〔 These spacecraft differ from their predecessors in that they possess enhanced navigation functions. They will have a new design and amenities, and more accurate chronometers. GLONASS K2 will emit new signals code division that will provide greater accuracy in determining the coordinates of the users, and more accurate binding in those systems, such as computer systems, where accurate time references are important. Thus, CDMA signals are transmitted at frequencies L3, as well as L1 and L2. In addition, the GLONASS K2 is installed with equipment that will provide functionality for the COSPAS-SARSAT international search and rescue system. 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「GLONASS-K2」の詳細全文を読む スポンサード リンク
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