Differential Global Positioning System

In: Computers and Technology

Submitted By cguida155
Words 2319
Pages 10

Differential Global Positioning Systems
Clay Guida
Southern Illinois University

Global Positioning Systems (GPS) have become one of the greatest innovations of the modern world. Simply put, your personal guide to anywhere in the world. It can accurately get a fix on your position to within 100 meters. This is where most people would say that their GPS gets them down to ten meters or less, and they would be right. But it is GPS in coordination with the Differential Global Positioning System (DGPS) that gets them that accurate of a location. To understand this we must start from the beginning and go over GPS’s history. From there we will take a look at what causes some of the inaccuracies that GPS can. Then we can see how DGPS counters these and gives you the most accurate reading you can have. Differential Global Positioning System, GPS’s right hand man for accuracy.
To understand how a DGPS helps a GPS we start at the beginning of it’s short history. Though made for use by the United States government, it was the Soviet Union that launched Sputnik in 1957 and gave us the idea. After the launch, Massachusetts Institute of Technology (MIT) researches observed that they could pick up the radio signal that Sputnik was producing. They also realized that the sound of this transmission varied with the proximity of Sputnik to its antenna receiver. As the satellite got closer to the receiver the strength of the signal got stronger. Likewise the satellite drawing farther away caused the signal received to decrease. This is called the Doppler shift or effect.
It was these increases and decreases that allowed the United States scientists to be able to track the satellite and its exact…...

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