Title of Presentation

NameTitleCompany Name

DIFFERENTIAL GPS (DGPS)Hayman S. Aahmed

HAWLER INSTITUTE OF TECHNOLOGY

What's the Differential ?Until 2000, civilian users had to contend with Selective satellite

signals to limit the effectiveness of GPS and its poteAvailability (SA).

The DoD intentionally introduced random timing errors in satellite

signals to limit the errors in ntial effectiveness of GPS misuse by

adversaries of the United States. These timing errors could affect the

accuracy of readings by as much as the accuracy of 100 meters.

With SA removed, a single GPS receiver from any manufacturer

can achieve accuracies of approximately 10 achieve accuracies.

To achieve the accuracies needed for quality GIS records from

one to two meters up to a few centimeters requires differential

correction of the requires differential correction of the data.

The majority of data collected using GPS for GIS is differentially

corrected to improve accuracy

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