Differential GPS

Differential GPS is used to increase the accuracy of normal GPS for applications like surveying, drilling, and oceanography. A reference station, located at a fixed position, tracks all the GPS satellites in view and computes the corrections based on their actual position and the GPS position. These corrections are broadcast to GPS users to improve their accuracy.

The principle of DGPS involves comparing the position obtained from a GPS receiver at a fixed point with the known location of the reference station. The reference station determines errors in the satellite signals by measuring the ranges of each satellite and comparing them to the actual ranges calculated from its known position.


These differential corrections are then transmitted to DGPS receivers and applied to their calculations, improving accuracy.

The level of accuracy depends on the GPS receiver and its proximity to the reference station. The reference station determines the error components and provides real-time corrections to the GPS receiver.

DGPS accuracy is typically 1-5 meters.

For Advanced Read, check out:Bridge Equipment for Navigation and Control

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