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GPS Block IIIA
GPS Block IIIA, or GPS III is the next generation of GPS satellites, which will be used to keep the Navstar Global Positioning System operational. Lockheed Martin is the contractor for the design, development and production of the GPS III Non-Flight Satellite Testbed (GNST) and the first eight GPS III satellites.〔("U.S. Air Force Awards Lockheed Martin Contracts to Begin Work on Next Set of GPS III Satellites" ) (Press release) Lockheed Martin 2013-02-25〕 The United States Air Force plans to purchase up to 32 GPS III satellites. GPS IIIA-1, the first satellite in the series, was projected to launch in 2014,〔("U.S. Air Force Awards Lockheed Martin GPS III Flight Operations Contract" ) (Press release) Lockheed Martin 2012-05-31〕 but significant delays〔(【引用サイトリンク】 Defense Acquisitions: Assessments of Selected Weapon Programs )〕 have pushed the launch to no earlier than 2017.〔(【引用サイトリンク】url=http://spacenews.com/launch-of-first-gps-3-satellite-now-not-expected-until-2017/ )〕
==Overview==
The United States' Global Positioning System (GPS) reached Fully Operational Capability on July 17, 1995,〔(【引用サイトリンク】 GPS FAQ )〕 completing its original design goals. However, additional advances in technology and new demands on the existing system led to the effort to modernize the GPS system. Announcements from the Vice President and the White House in 1998 initiated these changes. In 2000, the U.S. Congress authorized the effort, referred to as GPS III.
The project involves new ground stations and new satellites, with additional navigation signals for both civilian and military users, and aims to improve the accuracy and availability for all users.
Lockheed Martin was awarded the GPS III Space Segment contract on May 15, 2008. The first launch was projected for 2014. Raytheon was awarded the Next Generation GPS Operational Control System (OCX) contract on Feb 25, 2010.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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