My first guess is calibration and interpolation
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送交者: gyro 于 2009-05-05, 17:03:44:
回答: GPS uses 4 satellites to determine the position (time, and space) 由 steven 于 2009-05-05, 16:57:48:
use known positions on the ground to set up the calculation procedures. Use interpolation to infer the coordinates of other locations.
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