Civil Engineering MCQJE Level Civil Engineering
Minimum number of satellites required for 3D GPS positioning is:
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Choose the correct answer
A
2 satellites
B
3 satellites
C
4 satellites
D
8 satellites
Correct Answer
C. 4 satellites
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GPS needs 4 satellites simultaneously for 3D fix: 3 satellites give position in 2D (x, y, latitude, longitude) but there are two possible positions; the 4th resolves the 3D fix and corrects receiver clock error. With known altitude, 3 may suffice. Modern GPS receivers typically lock onto 6–12 satellites for accuracy.
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