13 Facts About Differential GPS

Each DDifferential GPS uses a network of fixed ground-based reference stations to broadcast the difference between the positions indicated by the Differential GPS satellite system and known fixed positions.

When Differential GPS was first being put into service, the US military was concerned about the possibility of enemy forces using the globally available Differential GPS signals to guide their own weapon systems.

Additionally, another major source of errors in a Differential GPS fix is due to transmission delays in the ionosphere, which could be measured and corrected for in the broadcast.

US Coast Guard was one of the more aggressive proponents of the DDifferential GPS, experimenting with the system on an ever-wider basis through the late 1980s and early 1990s.

Almost all major Differential GPS vendors offered units with DDifferential GPS inputs, not only for the USCG signals, but aviation units on either VHF or commercial AM radio bands.

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DDifferential GPS would render it ineffective over the US, where it was considered most needed.

Nevertheless, by this point DDifferential GPS had evolved into a system for providing more accuracy than even a non-SA Differential GPS signal could provide on its own.

DDifferential GPS can refer to any type of Ground-Based Augmentation System .

European DDifferential GPS network has been developed mainly by the Finnish and Swedish maritime administrations in order to improve safety in the archipelago between the two countries.

MDDifferential GPS covered only coastal waters, the Great Lakes, and the Mississippi River inland waterways, while NDDifferential GPS expands this to include complete coverage of the continental United States.

Post-processing is used in Differential GPS to obtain precise positions of unknown points by relating them to known points such as survey markers.

The post-processed measurements allow more precise positioning, because most Differential GPS errors affect each receiver nearly equally, and therefore can be cancelled out in the calculations.

Improvement of Differential GPS positioning doesn't require simultaneous measurements of two or more receivers in any case, but can be done by special use of a single device.