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Why we need Differential GPS

Why we need Differential GPS Basic GPS is the most accurate radio-based navigation system ever developed. And for many applications it’s plenty accurate. But it’s human nature to want MORE! So some crafty engineers came up with “Differential GPS,” a…
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How Differential GPS works

How Differential GPS works Differential GPS involves the cooperation of two receivers, one that’s stationary and another that’s roving around making position measurements. The stationary receiver is the key. It ties all the satellite measurements into a solid local reference….
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Why GPS?

Why GPS? Trying to figure out where you are and where you’re going is probably one of man’s oldest pastimes. Navigation and positioning are crucial to so many activities and yet the process has always been quite cumbersome. Over the…
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What is GPS?

What is GPS? The Global Positioning System (GPS) is a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations. GPS uses these “man-made stars” as reference points to calculate positions accurate to a matter of…
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Triangulating

Triangulating Improbable as it may seem, the whole idea behind GPS is to use satellites in space as reference points for locations here on earth. That’s right, by very, very accurately measuring our distance from three satellites we can “triangulate”…
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Measuring distance

Measuring distance Measuring distance from a satellite We saw in the last section that a position is calculated from distance measurements to at least three satellites. The Big Idea Mathematically: In a sense, the whole thing boils down to those…
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GPS Technology

GPS TECHNOLOGY The intent of this chapter is to present an overview of GPS technology and how it is used to track the movements of clients1 participating in community supervision programs. 1.1 Background/History Electronic technology has long been used as…
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