Global Positioning System(Gps)

Only available on StudyMode
  • Download(s) : 133
  • Published : May 20, 2012
Open Document
Text Preview
Research Paper on Global Positioning System
Abstract
Irrespective of time, location, and whether, Global Position System provides unparalleled range of services to commercial military and consumer applications. Majority of these services enables airborne, land, and sea users to know their exact velocity, location, and time whenever and wherever on Earth. The development and capabilities of the GPS technology have rendered obsolete and impractical, other traditional positioning and well-known navigation systems and technologies such as magnetic compasses, radio-based devices, and chronometers among others. Global Positioning System consists of 24 satellites, 21 of which are active while three (3) are spares and are located at an altitude of 10600 miles above the surface of the earth (El-Rabbany, 2002). GPS receivers on the ground is fitted with computers that are capable of triangulating its own sense after obtaining bearings from the other three (4) of the four (4) GPS satellites located in the same horizon. GPS segments are categorized into three distinct segments that include space segment, control segment, and user segment. Global Positioning systems perform an array of functions on land, in air, or at sea. There are specific features that make GPS systems be attractive. Despite the above advantages, a number of challenges that still impede the transmission of signals still exist within the limits of GPS technologies. Majority of these challenges includes errors such as inaccuracies associated with the reported location of satellites (orbital errors), receiver clock errors, signal multipath, and number of visible satellites, which can affect position reading or impede signal reception.

Global Positioning System
Irrespective of time, location, and whether, Global Position System provides unparalleled range of services to commercial military and consumer applications. Majority of these services enables airborne, land, and sea users to know their exact velocity, location, and time whenever and wherever on Earth. The development and capabilities of the GPS technology have rendered obsolete and impractical, other traditional positioning and well-known navigation systems and technologies such as magnetic compasses, radio-based devices, and chronometers among others. Twenty-four (24) GPS satellites are strategically located 10, 600 miles from Earth and they are in circular orbits with each other (El-Rabbany, 2002). The orbital period is 12 hours, and satellites are distributed in six orbital planes with equally spaced angles. Out of the 24 GPS satellites, twenty-one (21) are active while three (3) are spaces. The GPS satellites are spaced in such a manner that four (4) GPS satellites will always be beyond the horizon. In terms of structure and composition, each GPS satellite is equipped with an atomic clock, a computer, and a radio. Each radio understands its own clock and orbit thereby enabling it to broadcast continuously any changes in time and position. For instance, any minor corrections are made on each day after each GPS satellite verifies its own sense of position and time with other stations located on the ground. GPS receivers on the ground are fitted with computers that are capable of triangulating its own sense after obtaining bearings from the other three (4) of the four (4) GPS satellites located in the same horizon (El-Rabbany, 2002). The display screen on GPS receivers shows a map whereby the position of the object can be drawn from the map. Identification of geographic positions and altitude becomes possible if signals from the fourth satellite are receivable. Interestingly, the receivers are capable of calculating direction and speed during movements, and this capability enables navigators to estimate the arrival times to specified locations. Readings in most receivers are obtained in the form of geographic positions, that is, latitude and longitude. Finally, advanced and specialized GPS receivers can be...
tracking img