SBAS: The full name in English is Satellite-Based Augmentation System, which means wide-area differential augmentation system in Chinese. If you don’t know what this means, then I believe everyone knows the satellite-based augmentation system. The wide-area differential augmentation system is also the satellite-based augmentation system.
SBAS is a kind of GNSS enhancement. It is a satellite-based enhancement system. Relatively speaking, there are ground-based enhancement system GBAS and aircraft-based enhancement system ABAS.
The SBAS system is an enhanced system born to improve the positioning accuracy of the original satellite navigation system. It is mainly composed of four parts: ground reference base station, master control station, upload station and geosynchronous satellites. Let's take a look at the working principle:
The navigation satellites are monitored by a large number of widely distributed differential stations (locations are known), and the original positioning data (pseudorange, carrier phase observation value, etc.) are obtained and sent to the central processing facility (master control station), which is obtained by calculation Various positioning correction information of each satellite is sent to GEO satellites through the uplink injection station, and finally the correction information is broadcast to the majority of users, so as to achieve the purpose of improving positioning accuracy
At present, countries all over the world have established complete SBAS systems, including WAAS in the United States, EGNOS in Europe, MSAS in Japan and GAGAN in India.
SBAS is mainly used in aviation and navigation. Satellite-based augmentation systems are rarely used in ordinary surveys, and ground-based augmentation systems are mainly used.
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