Global positioning system measurements for crustal deformation - Precision and accuracy

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Change Detection, Deformation, Earth Crust, Geodetic Accuracy, Global Positioning System, Plates (Tectonics), Precision, Standard Deviation

Scientific paper

The repeatability of Global Positioning System (GPS) vectors is examined and GPS measurements are compared with those from other techniques. A total of 27 repeated observations of GPS position-difference vectors up to 11 km in length indicates that the standard deviation of the measurements is 4 millimeters for the north component, 6 millimeters for the east component, and 10 to 20 millimeters for the vertical component. The uncertainty grows slowly with increasing vector length. At 225 km, the standard deviation of the measurement is 6, 11, and 40 millimeters for the north, east, and up components, respectively. Measurements with GPS and Geodolite, an electromagnetic distance measuring system, over distances of 10 to 40 km agree within 0.2 part per million. Measurements with GPS and VLBI of the 225-km vector agree within 0.05 part per million.

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