The Global Pisition System: GPS: Global Positioning System

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GPS (GLOBAL POSITIONING SYSTEM)
The Global Positioning System (GPS) is a space-based navigation system which provides information on location and time under all weather conditions, anywhere on or near the earth where there is an unobstructed line of sight to four or more GPS satellites. The system provides critical capabilities to military, civil, and commercial users around the world. The United States government created the system, maintains it, and makes it freely accessible to anyone with a GPS receiver. The US Department of Defense (DoD) developed the system, which originally used 24 satellites. It became fully operational in 1995. Bradford Parkinson, Roger L. Easton, and Ivan A. Getting are credited with inventing it. GPS technology was …show more content…

GPS has become a widely deployed and useful tool for commerce, scientific uses, tracking, and surveillance. GPS's accurate time facilitates everyday activities such as banking, mobile phone operations, and even the control of power grids by allowing well synchronized hand-off switching.Many civilian applications use one or more of GPS's three basic components: absolute location, relative movement, and time transfer. The wide variety of fields of application of GPS for civilian use includes Astronomy, Cartography, Cellular telephony, Clock synchronization, Disaster relief/emergency services, Radio, aircraft tracking, Navigation, Tours, Mining, Surveying, Tectonics, etc.
The military applications of GPS include Navigation, Target tracking, Missile and projectile guidance, Search and rescue, Reconnaissance, attaching guidance kit to dumb bombs, etc.

Demodulation and decoding
Since, all of the satellite signals are modulated onto the same carrier frequency, the signals must be separated after demodulation. This is done by assigning each satellite a unique binary sequence known as a Gold code. The signals are decoded after demodulation using addition of the Gold codes corresponding to the satellites monitored by the receiver.

Data transfer and storage mechanism Data

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