Global Positioning System
GPS is a navigation system that gives our exact location on earth at any time and anywhere. It is a high precision tracking system that provides accurate location coordinates mapping even the remotest of locations. Though it was initially designed, developed and controlled by the U.S. department of defense for its military purposes, it soon became available for the civil users worldwide. This navigation system covers the entire surface on earth using 24 satellites (and 3 additional) that orbit around it at a height of 11,000 nautical miles. [The Aerospace Corporation]. Ground stations based in five different locations on earth receive signals transmitted by these satellites and send data, which are used to monitor and control the satellites. Considered a revolutionary breakthrough in the field of navigation, this technology is finding newer applications everyday. A brief overview would provide us a better insight into the subject.
Global Positioning System
GPS makes use of high frequency radio wave transmitters stationed in space making it possible to cover the entire globe accurately. Locations can be tracked to precision up to a height of 300 ft above earth. The GPS system has three different segments namely the space segment, ground-based control stations and the user segment. As discussed above the space segment is composed of 24 satellites moving in fixed orbits taking 12 hours to complete one full circle across the earth. The GPS communication system with all the 24 satellites was completed in 1994. The orbits of these satellites are arranged such that at any point of time at least 4 of them are in visual range from any point on earth. [The Aerospace Corporation]
GPS Control Stations
The control stations are based in strategic locations across the globe. There are a total of 5 such control stations that are based in Hawaii, Kwajalein Island in the South Pacific Ocean; Schriever Air force base in Colorado Springs, the Diego Garcia Island in the Indian...
While this presents enterprises with unequalled levels of potential productivity gains, it also presents security and privacy challenges as well. In the context of cyber foraging, the issues of ethicacy and opt-in meet head-on, as the use of servers to cache locations and define locational preferences and habits of consumers. For these privacy reasons and the untested nature of location-aware advertising services, it is anticipated that GPS-enabled networks such
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