There are many special requirements for GPS that can be augmented to meet user needs (PNT) for GPS positioning, navigation and timing. Enhancement is a system that improves the positioning, navigation and timing accuracy, integrity, reliability and availability of the GPS itself.
It includes, but is not limited to, the following five.
I. Nationwide Differential GPS System (NDGPS): NDGPS It is a ground-based augmentation system managed and maintained by the Federal Railroad Administration, the U.S. Coast Guard, and the Federal Highway Administration to provide ground and surface users with a more accurate and complete service GPS. modern efforts include the development of a high-precision working NDGPS system (HA- NDGPS) for performance enhancement to achieve an accuracy of 10-15 cm over the entire coverage area.The NDGPS is built to international standards, and more than 50 countries around the world have adopted similar standards.
II.Wide Area Augmentation System (WAAS): WAAS The Federal Aviation Administration (FAA) satellite-based augmentation system provides navigation for all phases of aircraft navigation. Today, due to this similarity, this feature is widely used in other areas GPS The signal can be processed by simple receivers without additional equipment. Using the standards of the International Civil Aviation Organization (ICAO), the FAA continues to work with other countries to provide flawless service to all users in any area. Other national ICAO-standard space-based augmentation systems include the European Geostationary Navigation Overlay System (EGNOS), India's GPS Geo-Navigation Augmentation System (GAGAN), and the Multi-function Transmission (MTSAT) Satellite Augmentation System (MSAS) for Japanese satellites. All of these international applications are GPS-based. the FAA will improve WAAS to provide better service utilizing future GPS life safety signals and promote these new capabilities globally.
Continuously Operating Reference Station (CORS): The U.S. CORS network, managed by the National Oceanic and Atmospheric Administration (NOAA), is responsible for the preservation and distribution of GPS data, primarily through post-processing, for precise positioning and atmospheric modeling applications.CORS supports real-time user updates in the modern era.
Global Discrepancy GPS (GDGPS): GDGPS Laboratory was developed by Jet Propulsion (JPL) with high precision GPS is used to support real-time positioning, timing, and orbit determination required by NASA's need for science missions. future NASA plans include the use of the Tracking and Data Relay System (TDRSS) to distribute real-time discrepancy correction information via satellite. This system is called the TDRSS Augmentation Service Satellite (TASS).
V. International GNSS Service (IGS): IGS provides 350 GPS from 200 organizations in 80 countries a network of monitoring stations. Its mission is to follow the Global Navigation Satellite System (GNSS) standard to provide the highest quality data and products in support of Earth science research, interdisciplinary applications and education, and to promote other socially beneficial uses. Approximately 100 IGS monitoring stations are available to broadcast tracking data within an hour of collection.
There are other augmentation systems around the world, both governmental and commercial. These systems use differentiated, static or real-time technologies.
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