GPS, or Global Positioning System, has become for the 21st century what bloodhounds and used to be for police forces and bread crumbs were for Hansel and Gretel: both a way to find a person or target, and a way for a person to keep from becoming lost. GPS uses its “eyes in the sky”, a group of twenty-one operating and three backup satellites in orbit nearly twelve thousand miles above the Earth, to interpret the signals sent from GPS devices down below.
GPS translates those signals into information about the latitude, longitude, and altitude of the device that sent it, and beams the information back to a GPS receiver in the same device. The whole operation is done in split seconds, accurate to within five meters, and is the result of over three decades and twelve billion (and rising) dollars spent by the US Department of Defense.
Military GPS Applications
While the DoD initially installed GPS systems in their Intercontinental Ballistic Missiles to help them locate their targets with pinpoint accuracy, the GPS technology has now fund applications far beyond its use in weapons systems. The US military used it once again in 1991, during the first Gulf War, when GPS was essential for the mapping of huge uncharted tracts of desert.
Because GPS information can be provided as a readout, interpreted, and printed as a map of the target terrain, it saved the military countless man-hours and risk to the personnel who would otherwise have had to map the desert while airborne. GPS has its defensive purposes as well; it allows a country to monitor the movements of military troops in another country across the globe and to prepare for an attack well lin advance.
Commercial GPS Application
The first non-military use of sGPS was for marine applications; those lost at sea and unable to navigate by traditional means could simply push a button to signal the GPS satellites and have their latitude and longitude appearing on a screen in a matter of seconds. Today GPS is most widely used in the aviation industry, as an aid to routing aircraft.
GPS technology has advanced so much, in fact, that it is now possible for ships’ computers to be linked to a GPS system which automatically navigates to a preprogrammed destination. GPS can function as both s ship’s navigator and captain, although it is highly improbable that it will replace them.
GPS, in both its military and commercial applications, has made the world a much smaller and safe, place!
By: David Faulkner
Posts Tagged ‘Latitude Longitude’
What Is GPS and How Can It Be Used?
February 8th, 2010
GPS stands for Global Positioning System and was initially designed to be used by the U.S. military and is operated by the U.S. Defense Department. This system consists of 24 satellites, these satellites are 12,000 miles above us, are constantly moving in a precise orbit, have an atomic clock, and are solar powered. They do have a battery backup so they will continue to run in the event of a solar eclipse, and each satellites has a small rocket booster to maintain their orbit. The first satellite was launched in 1978 and it wasn’t until 1994 when there were a total of 24 satellites. Each satellite has a life expectancy of about 10 years, so new satellites are constantly being built and launched. Each satellite weighs about 2,000 pounds and is approximately 17 feet in width when the solar panels are extended. In the 1980s the GPS became available to the public, and although it is still maintain by the U.S. Defense Department there is no charge for its usage by the public.
These 24 satellites orbit the earth twice a day and continuously sends the location of the satellite. A GPS system can tell how far a satellite is away by comparing the time difference between the time a signal was transmitted and the time it was received, the longer it takes the signal to be received by a receiver, the farther away the satellite is. If a GPS is receiving signals from three satellites it can calculate latitude and longitude. Altitude can be determined if the GPS is receiving signals from four satellites.
GPS can be used for navigating your car through traffic day-to-day or tracking a fleet of vehicles. Not only can a driver use a GPS for directions the main office knows where that vehicle is and the speed of the vehicle. GPS can be used while on vacation for activities such as hiking, camping, or hunting. Is your passion fishing but get frustrated trying to find the fish? With a fish finder which uses both GPS technology and sonar you’ll know exactly where to go to find those fish. GPS technology is also being used as a way to track your pet if he wanders off or to safeguard a pet from being stolen.
Another use for GPS is as a child finder with a receiver in a child’s cell phone or wristwatch to ensure a child’s safety. It can be used in a teenager’s car in order to both know where they and how fast they are driving. This could also be used to keep track of someone who tends to ‘roam’ but is not capable enough to find there way back; i.e. someone with Alzheimer’s disease.
As GPS technology improves, it uses will increase. Who knows where it will take us next?
Copyright 2006 Angela Carter
By: Angie Carter
