Define differential gps with it error source with help of neat sketch
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Differential Global Positioning Systems(DGPS) are enhancements to the Global Positioning System (GPS) which provide improved location accuracy, in the range of operations of each system, from the 15-meter nominal GPS accuracy to about 10 cm in case of the best implementations.
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Differential correction is a class of techniques for improving the accuracy of GPS positioning by comparing measurements taken by two or more receivers. Here's how it works: ... 1 A GPS base station is fixed over a control point, while about 25 km away, a mobile GPS receiver is used to measure a series of positions.
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