The user data center subsystem is generally located in the management center, and its functions include real-time network data services and post event data services. The data processed by user data centers can be divided into two categories: real-time data and post event data. Real time data includes correction data required for RTK positioning, Completeness information of the system and user authorization information. The post event data includes the data results collected by each benchmark station, which are used for precise differential analysis by users after the event; Other application classes include coordinate system conversion, elevation calculation, and control point coordinates. Its main functions include:

　　① Real time data transmission. Using CDMA and GPRS communication methods to connect to the center, using different authentication methods and combinations including username and password verification, mobile number verification, IP address verification, GPUID verification, etc., to securely and multi-channel broadcast RTK correction data.

　　② Information download. Users log in to the network server through FTP and choose to download benchmark station data based on the time period

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