Ground-Based Augmentation System
Ground-Based Augmentation System is a national ground based augmentation system established on the basis of existing monitoring stations, in accordance with the principle of “unified planning, unified standards, joint construction and sharing”, organized by China Satellite Navigation Office and support by the Ministry of Transport, the former Ministry of Land and Resources.
As of November 2018, more than 2,200 reference stations have been completed, making it the world's largest, most widely-covered, stable-running ground based augmentation system. Among the system's reference stations, about 1500 are equipped with GNSS OEM boards and receivers of Unicorecomm.
The system has the basic service capability to provide real-time meter, decimeter, centimeter, and post-processing millimeter-level high-precision positioning on land throughout the country. Based on the high precision data of Beidou/GNSS, the system can also provide high time resolution data of water vapor and ionospheric electron density, increasing the time density of water vapor observation from 2 times to more than 24 times a day, and enhancing the operational stability of existing ionospheric monitoring, thus providing important reference for improving the level of weather forecast and early warning against sudden disasters and space weather.
The establishment of the national Beidou data integrated processing center has initially realized cross-industry connectivity. The data center has the data storage and processing capabilities that support Beidou, GPS, GLONASS, more than 120 satellites and 2,200 reference stations. As the ecological core of Beidou industry, it has basic capabilities for basic resource management, data storage and mining, production of high-precision service products, technical verification of space-time service, and performance evaluation of Beidou services.