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Systems Tool Kit : ウィキペディア英語版
Systems Tool Kit

Systems Tool Kit (formerly Satellite Tool Kit), often referred to by its initials STK, is a physics-based software package from Analytical Graphics, Inc. that allows engineers and scientists to perform complex analyses of ground, sea, air, and space assets, and share results in one integrated solution. At the core of STK is a geometry engine for determining the time-dynamic position and attitude of objects ("assets"), and the spatial relationships among the objects under consideration including their relationships or accesses given a number of complex, simultaneous constraining conditions. STK has been developed since 1989 as a commercial off the shelf software tool. Originally created to solve problems involving Earth-orbiting satellites, it is now used in the aerospace and defense communities and for many other applications.
AGI states that STK has more than 40,000 installations at more than 800 global organizations such as NASA, ESA, CNES, DLR, Boeing, JAXA, ISRO, Lockheed Martin, Northrop Grumman, EADS, DOD, and Civil Air Patrol.
AGI posts (Case Studies here ) of its customers in the areas of:
*Space situational awareness
*Space missions
*Aircraft missions (including UAVs commonly known as drones)
*Missile defense
*ISTAR/ISR/C4ISR
*Electronic systems and communications
STK (can be downloaded for free ) and has paid upgrade modules for more complex capability. As of release 10, the free version of STK includes 3D visualization, previously a paid upgrade module.
== History ==

In 1989, the three founders of Analytical Graphics, Inc. - Paul Graziani, Scott Reynolds and Jim Poland, left GE Aerospace to create Satellite Tool Kit (STK) as an alternative to bespoke, project-specific aerospace software.
The original version of STK ran only on Sun Microsystems computers, but as PCs became more powerful, the code was converted to run on Windows.
STK was first adopted by the aerospace community for orbit analysis and access calculations (when a satellite can see a ground-station or image target), but as the software was expanded, more modules were added that included the ability to perform calculations for communications systems, radar, interplanetary missions and orbit collision avoidance.
The addition of 3D viewing capabilities led to the adoption of the tool by military users for real-time visualization of air, land and sea forces as well as the space component. STK has also been used by various news organizations to graphically depict current events to a wider audience, including the deorbit of Russia's Mir Space Station, the Space Shuttle Columbia diasaster, the Iridium/Cosmos collision, the asteroid 2012 DA14 close approach and various North Korea missile tests.
As of version 10, the software underwent a name change from Satellite Tool Kit to Systems Tool Kit.

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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