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Tuesday, April 23, 2013

Global Positioning System


Initially, the highest quality signal was reserved for military use, and the signal available for civilian use was intentionally degraded (Selective Availability). This changed with President Bill Clinton ordering Selective Availability to be turned off at midnight May 1, 2000, improving the precision of civilian GPS from 100 meters (330 ft) to 20 meters (66 ft). The executive order signed in 1996 to turn off Selective Availability in 2000 was proposed by the U.S. Secretary of Defense, William Perry, because of the widespread growth of differential GPS services to improve civilian accuracy and eliminate the U.S. military advantage. Moreover, the U.S. military was actively developing technologies to deny GPS service to potential adversaries on a regional basis.[18]
Over the last decade, the U.S. has implemented several improvements to the GPS service, including new signals for civil use and increased accuracy and integrity for all users, all while maintaining compatibility with existing GPS equipment.  READ MORE

1 comment:

  1. This is a great article and very informative. I love how the military and NASA are using GPS systems for such advanced tasks. The military have been using them for missile launching as well. I was also amazing when I first found out that the military are using GPS systems for unmanned aerial vehicles. This allows them to accomplish so much more and may even safe some lives of soldiers.


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