Differential GPS (DGPS) achieves higher accuracy than standalone GPS by:
Choose the correct answer
Using more satellites
Using a reference receiver at a known point to compute and broadcast corrections for atmospheric and orbital errors, applied at the roving receiver
Increasing satellite power
Using L2 carrier phase only
Correct Answer
B. Using a reference receiver at a known point to compute and broadcast corrections for atmospheric and orbital errors, applied at the roving receiver
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DGPS: Reference station at known coordinates measures GPS error (difference between computed and known position). Corrections broadcast to rover via radio/internet. Corrections valid within ~300 km of reference. Accuracy: standalone GPS = 5-10 m; DGPS = 0.5-5 m; CORS DGPS = 0.1-1 m; RTK = 2-5 cm.
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