Enhancement to the Global Positioning System providing improved accuracy
Transportable DGPS reference station Baseline HD by CLAAS for use in satellite-assisted steering systems in modern agriculture
Differential Global Positioning Systems (DGPSs) supplement and enhance the positional data available from global navigation satellite systems (GNSSs). A DGPS for GPS can increase accuracy by about a thousandfold, from approximately 15 metres (49 ft) to 1–3 centimetres (1⁄2–1+1⁄4 in).[1]
DGPSs consist of networks of fixed position, ground-based reference stations. Each reference station calculates the difference between its highly accurate known position and its less accurate satellite-derived position. The stations broadcast this data locally—typically using ground-based transmitters of shorter range. Non-fixed (mobile) receivers use it to correct their position by the same amount, thereby improving their accuracy.
The United States Coast Guard (USCG) previously ran DGPS in the United States on longwave radio frequencies between 285kHz and 325kHz near major waterways and harbors. It was discontinued in March 2022.[2] The USCG's DGPS was known as NDGPS (Nationwide DGPS) and was jointly administered by the Coast Guard and the Army Corps of Engineers. It consisted of broadcast sites located throughout the inland and coastal portions of the United States including Alaska, Hawaii and Puerto Rico. The Canadian Coast Guard (CCG)[3] also ran a separate DGPS system, but discontinued its use on December 15, 2022. Other countries have their own DGPS.[citation needed]
A similar system which transmits corrections from orbiting satellites instead of ground-based transmitters is called a Wide-Area DGPS (WADGPS)[4] satellite-based augmentation system.
^"Satellite Positioning Service of the Official German Surveying and Mapping (SAPOS) Brochure" (PDF). SAPOS. 2015. Archived (PDF) from the original on 18 January 2021. Retrieved 25 November 2021.
^"GPS.gov - Augmentation Systems". gps.gov. United States Air Force. 14 March 2012. Archived from the original on 24 January 2021. Retrieved 7 July 2013.
^Kee, Changdon; Parkinson, Bradford; Axelrad, Penina (1 June 1991). "Wide Area Differential GPS". Navigation. 38 (2): 123–145. doi:10.1002/j.2161-4296.1991.tb01720.x. eISSN 2161-4296.
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