DGPS stands for Differential global positioning system.

• A. Differential Global Positioning System
• B. Dynamic Global Positioning System
• C. Differential Geographic Positioning System
• D. Direct Global Positioning Service

Answer: (A)

DGPS stands for Differential Global Positioning System. The word “differential” refers to the corrections provided by a fixed ground reference station that knows its exact position. By comparing the position shown by GPS satellites to its true position, the station determines the errors in the satellite signals. It then broadcasts these corrections, which a user’s receiver applies to its own GPS measurements, yielding much higher accuracy and reliability. The other terms don’t fit because the standard name uses “Global Positioning System,” not “Geographic” or “Service,” and the modifier is “Differential,” not “Dynamic.” In practice, DGPS augments GPS with these corrections through networks like WAAS or local DGPS services.