Differential GPS

Differential GPS

Combating GPS Error

Differential GPS (DGPS) Basics

GPS Base Station Log
(Geographic Coordinates)

GPS Base Station Log
(UTM Coordinates)

GPS Position Plot (UTM)

GPS Error Vector Plot (UTM)

DGPS Method 1: Real-time Base Station Corrections

DGPS Method 1: Real-time Base Station Corrections (con’d)

DGPS Method 2: Post-processing

Where Can We Obtain (free!) Base Station Files for Post-Processing?

Method 3: DGPS Using Satellite-transmitted Correction Signals

DGPS Method 3: DGPS via the Coast Guard Beacon!

GPS vs. DPGS