GPS augmentation system

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GPS augmentation system

A system that improves the accuracy of the GPS satellite navigation system. A satellite's positioning accuracy is impeded by errors in its clock and signal delays caused by atmospheric conditions. Also called a "differential GPS" (DGPS), an augmentation system compensates for those discrepancies by transmitting corrections to the GPS receivers either via satellite or terrestrial radio. Instead of the normal GPS accuracy, which is approximately 15 to 70 feet, augmented systems pinpoint a location within a range of two to 10 feet, depending on the system, and as little as four inches in the case of commercial systems.

They Work Because of Known Locations
An augmentation system uses earth stations that have been very carefully surveyed, and their exact locations are known with great precision. As they receive signals from the GPS satellites, they are compared with the values they should be receiving, and the differences are used to calculate corrections. The corrections are transmitted either to the GPS receivers via geostationary satellites or terrestrial radio.

Space Based Vs. Ground Based
A space-based augmentation system (SBAS), also called a "wide area augmentation system," transmits corrections to one or more geostationary satellites, which have a wide footprint on earth. The augmentation satellites rotate with the earth and are always in a fixed location above the earth, unlike the GPS satellites, which revolve around the earth. The predominant space-based systems are WAAS in the U.S., CDGPS in Canada, EGNOS in Europe and MSAS in Japan (see WAAS, CDGPS, EGNOS and MSAS).

There are also commercial space-based systems such as OmniSTAR (, Fugro ( and StarFire (, which can pinpoint a location with extreme accuracy. Used in the oil, gas, mining and construction industries as well as agriculture, such systems require specialized receivers, not the in-dash navigation systems found in automobiles.

A ground-based augmentation system (GBAS) uses radio towers to transmit corrections to the GPS receiver. There are hundreds of ground-based augmentation systems around the world transmitting in a wide variety of frequencies, from 162.5 kHz to 2.95 MHz. In the U.S., the Nationwide Differential GPS ( NDGPS) system is a major example. See GPS, LORAN, Galileo and Selective Availability.

GPS Augmentation
A GPS receiver can obtain corrections from space-based or ground-based augmentation systems. The receivers must be specialized for each type of correction service, and many earlier receivers used only the GPS signals. This illustration highlights only the receiver signal paths. Each system comprises numerous earth stations and terrestrial processing centers.
References in periodicals archive ?
Wide Area Augmentation System (WAAS), European Geostationary Navigation Overlay System (EGNOS), and Japan's Multi-Functional Satellite Augmentation System (MSAS).
Additionally, it has two Satellite-Based Augmentation System (SBAS) channels for Wide Area Augmentation System (WAAS), European Geostationary Navigation Overlay Service (EGNOS) or Multi-functional Transport Satellite Augmentation System (MSAS).
New Features Offer Improved Field Usability and Connectivity Enterprise-ready and built to work with Windows 8** and featuring a multi-touch user interface, Motion Tablet PC users are also seamlessly connected through robust communications support such as optional integrated Gobi[TM] connectivity, optional integrated GPS with support for Wide Area Augmentation System (WAAS), Euro Geostationary Navigation Overlay Service (EGNOS), and Multi-purpose Satellite Augmentation System (MSAS)*** for increased accuracy and faster satellite acquisition time.
Wide Area Augmentation System (WAAS), European Geostationary Overlay Service (EGNOS) and Japan's Multi-functional Satellite Augmentation System (MSAS).
The company developed the Federal Aviation Administration's Wide Area Augmentation System and was engaged in the Japan Civil Aviation Bureau's Multi-Function Transport Satellite Augmentation System.
There are also four channels dedicated to tracking Space Based Augmentation Systems (SBAS), including Wide Area Augmentation System (WAAS) in North America, European Geostationary Navigation Overlay System (EGNOS) in Europe, Multi-functional Satellite Augmentation System (MSAS) in Japan, Omnistar services and others.
For instance, the Wide Area Augmentation System was certified by the Federal Aviation Administration in July 2003, and the MTSAT Satellite Augmentation System was certified by the Japanese Civil Aviation Bureau in September 2007.
Wide Area Augmentation System (WAAS), the European GPS Navigation Overlay System (EGNOS), and Japan's MTSAT Satellite Augmentation System (MSAS).
Other governments are developing similar differential systems such as the Japanese Multi-Functional Satellite Augmentation System (MSAS) and the European Euro Geo Stationary Overlay Program (EGNOS) system.
The MSAS program is an extension of the World Satellite Augmentation System for GPS that is initially being fielded by the FAA in the U.
com/research/1003224) describes the underlying technologies and status of satellite positioning technologies including satellite augmentation systems, and high precision technology based on DGPS and RTK.
Border & Costal Patrol and Monitoring -- Homeland Security -- Law Enforcement & Disaster Operations -- Digital Mapping & Planning / Land Management -- Search & Rescue -- Fire Detection and Firefighting Management -- Communications and Broadcast Services -- Precision Agriculture and Fisheries -- Ground Transportation Monitoring and Control -- Satellite Augmentation Systems -- Air Traffic Control Support -- Power Transmission line Monitoring -- Environmental Research & Air Quality Management / Control -- Hurricane and Tornado early warning systems -- Emergency Response -- Fire and rescue -- Search and Rescue -- Hurricane and Tornado early warning systems

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