DGPS survey

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The basis of DGPS is "triangulation" from satellites

To "triangulate," a DGPS receiver measures distance using the travel time of radio signals

To measure travel time, DGPS needs very accurate timing which it achieves with some tricks

Along with distance, you need to know exactly where the satellites are in space. High orbits and careful monitoring are the secret

Finally you must correct for any delays the signal experiences as it travels through the atmosphere