The 'Global Navigation Satellite System' (GNSS) positioning accuracy can be improved by:
Choose the correct answer
Using only one satellite
DGPS correction from reference station, RTK (cm accuracy), or dual-frequency for ionospheric correction
Turning off atmospheric corrections
Reducing the number of visible satellites
Correct Answer
B. DGPS correction from reference station, RTK (cm accuracy), or dual-frequency for ionospheric correction
Why is this the answer?
GNSS accuracy improvement: (1) DGPS (Differential GPS): reference station computes correction; broadcasts to rover (sub-metre accuracy); (2) RTK (Real-Time Kinematic): carrier-phase corrections from base to rover by radio (centimetre accuracy); (3) PPP (Precise Point Positioning): global correction service (few cm); (4) SBAS (Satellite-Based Augmentation: GAGAN for India — 1–3 m); (5) Dual-frequency to correct ionospheric error.
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