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DGNSS Systems: Difference between revisions
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* United States | * United States | ||
The first | The first DGNSS system was developed by the [http://www.uscg.mil/ United States Coast Guard], called firstly DGPS and that has evolved to the US NDGPS (Nationwide Differential Global Positioning System). | ||
The [[United States Department of Transportation]], in conjunction with the [[Federal Highway Administration]], the [[Federal Railroad Administration]] and the [[U.S. National Geodetic Survey|National Geodetic Survey]] appointed the [[United States Coast Guard|Coast Guard]] as the maintaining agency for the U.S. Nationwide DGPS network. The system is an expansion of the previous Maritime Differential GPS (DGPS) which the Coast Guard began in the late 1980s and completed in March 1999. DGPS only covered coastal waters, the Great Lakes, and the Mississippi River inland waterways, while NDGPS expands this to include complete coverage of the continental United States.<ref>http://www.navcen.uscg.gov/pdf/frp/frp2005/2005%20FRP%20WEB.pdf</ref> The centralized Command and Control unit is USCG Navigation Center, based in Alexandria, VA.<ref> | |||
United States Coast Guard Navigation Center, Alexandria, VA; ''Standard Operating Procedures'' (2002) | |||
</ref> The USCG has carried over its NDGPS duties after the transition from the Department of Transportation to the [[United States Department of Homeland Security|Department of Homeland Security]]. There are 82 currently broadcasting NDGPS sites in the US network, with plans for up to 128 total sites to be online within the next 15 years. | |||
They run one such system in the US and Canada on the longwave radio frequencies between 285 kHz and 325 kHz. These frequencies are commonly used for marine radio, and are broadcast near major waterways and harbors. | They run one such system in the US and Canada on the longwave radio frequencies between 285 kHz and 325 kHz. These frequencies are commonly used for marine radio, and are broadcast near major waterways and harbors. | ||
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*European DGPS Network | *European DGPS Network | ||
==Other DGNSS Systems== | ==Other DGNSS Systems== | ||
Revision as of 14:17, 3 June 2011
| Fundamentals | |
|---|---|
| Title | DGNSS Systems |
| Author(s) | GMV |
| Level | Basic |
| Year of Publication | 2011 |
Among the different GNSS Augmentation systems, the DGNSS system are widely used by navigation users. Nowadays, almost all commercial GPS units, even hand-held units, now offer DGPS data inputs. To some degree, a form of DGPS is now a natural part of most GPS operations.
DGNSS Systems
There are many operational systems in use throughout the world, according to the US Coast Guard, 47 countries operate systems similar to the US NDGPS (Nationwide Differential Global Positioning System). Next, there are some significant examples of DGNSS systems by country:
- United States
The first DGNSS system was developed by the United States Coast Guard, called firstly DGPS and that has evolved to the US NDGPS (Nationwide Differential Global Positioning System). The United States Department of Transportation, in conjunction with the Federal Highway Administration, the Federal Railroad Administration and the National Geodetic Survey appointed the Coast Guard as the maintaining agency for the U.S. Nationwide DGPS network. The system is an expansion of the previous Maritime Differential GPS (DGPS) which the Coast Guard began in the late 1980s and completed in March 1999. DGPS only covered coastal waters, the Great Lakes, and the Mississippi River inland waterways, while NDGPS expands this to include complete coverage of the continental United States.[1] The centralized Command and Control unit is USCG Navigation Center, based in Alexandria, VA.[2] The USCG has carried over its NDGPS duties after the transition from the Department of Transportation to the Department of Homeland Security. There are 82 currently broadcasting NDGPS sites in the US network, with plans for up to 128 total sites to be online within the next 15 years.
They run one such system in the US and Canada on the longwave radio frequencies between 285 kHz and 325 kHz. These frequencies are commonly used for marine radio, and are broadcast near major waterways and harbors.
- Australia
Australia runs two DGPS systems: one is mainly for marine navigation, run by Australian Maritime Safety Authority, broadcasting its signal on the longwave band; the other is used for land surveys and land navigation, and has corrections broadcast on the Commercial FM radio band.
- Canada
The Canadian system is similar to the US system and is primarily for maritime usage covering the Atlantic and Pacific coast as well as the Great Lakes and Saint Lawrence Seaway. It has been developed by the Canadian Coast Guard
- European DGPS Network
Other DGNSS Systems
There are other DGNSS techniques used by high-precision navigation/surveying applications, based on the use of carrier phase measurements. These are the cases of the Real Time Kinematic (RTK) and the Wide Area RTK (WARTK), where the differential GPS measurements are computed in real-time by specific GPS receivers if they receive a correction signal using a separate radio receiver.
Notes
References
- ^ http://www.navcen.uscg.gov/pdf/frp/frp2005/2005%20FRP%20WEB.pdf
- ^ United States Coast Guard Navigation Center, Alexandria, VA; Standard Operating Procedures (2002)