GPS Basic Information
Below is a MRR and PLR article in category Computers Technology -> subcategory Web Development.
Understanding GPS: A Comprehensive Overview
Introduction
Global Positioning System (GPS) is an integral Global Navigation Satellite System that has transformed navigation and location tracking. Comprised of an artificial constellation of 24 satellites in medium Earth orbit, GPS uses microwave signals to enable receivers to ascertain their location, speed, direction, and time. Initially developed by the United States Department of Defense, it was named NAVSTAR GPS by John Walsh.
Management and Cost
The United States Air Force 50th Space Wing manages this satellite constellation. Operating costs, including maintenance, replacement, and research, amount to approximately $750 million annually. In 1983, following the unfortunate shoot-down of Korean Air Lines Flight 007, a directive expanded GPS access to civilian use, significantly enhancing its utility in mapping, surveying, commerce, and scientific research. It also provides a critical time reference used in earthquake studies and telecommunications.
How GPS Works
A GPS receiver calculates its position by measuring the distance to at least three satellites, which continuously transmit data containing their exact time and location. With this information, the receiver forms a "trilateration" to pinpoint its position. A fourth satellite assists in refining the accuracy and eliminates the need for an onboard clock in the receiver.
Military Applications
GPS is indispensable in military operations, aiding soldiers in navigation and coordinating troop movements. Military personnel utilize GPS devices known as Commanders and Soldier Digital Assistants, and real-time vehicle tracking is facilitated through GPS and radio communication. The system helps identify hostile targets and guides precision munitions, aiding in air-to-ground combat and missile targeting. Moreover, GPS technology is embedded in artillery projectiles, allowing them to withstand forces up to 12,000G.
Civilian Uses
GPS benefits civilians with its precision in surveying and navigation. It accurately calculates local speed and orientation. GPS also enables time synchronization, essential for technologies like CDMA digital cell phones, ensuring seamless communication between base stations and aiding emergency calls. Additionally, the system has revolutionized tectonics by measuring fault movements during earthquakes.
Acknowledgements and Other Systems
GPS pioneers Ivan Getting and Bradford Parkinson were honored with the National Academy of Engineering’s Charles Stark Draper Prize in 2003. Roger L. Easton received the National Medal of Technology in 2006. Other global systems similar to GPS include China's Beidou (set to expand into COMPASS), the European Union's Galileo in collaboration with countries like India and China, Russia's GLONASS available in partnership with India, India’s regional IRNSS, and Japan’s proposed QZSS.
In summary, GPS is a critical technology with vast military and civilian applications, enhancing navigation and communication across the globe.
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