Master Control Station Architecture
The NAVSTAR Master Control Station is significantly altered in this redesign. The
existing architecture (shared memory redundant mainframe computers) is replaced by
that shown in the diagram below:
Key features of the new Master Control Station hardware/software architecture are as
follows:
- A pair of redundant, fault tolerant high-speed computational servers replace the
existing shared-memory mainframes. These servers perform ephemeris and clock
correction calculations.
- A fault-tolerant mission planning server is used to perform mission planning, status
tracking, and system management functions.
- A fault-tolerant database server is used to maintain system database information
(satellite health database, correction history database, etc . . . )
- A high-speed LAN is used to provide connectivity between servers.
- A router is used to provide a communications gateway to external NAVSTAR
stations via the NAVSTAR private internet.
- User workstations are connected as required.
- DCE middleware is used to provide standardized API/RPC environment.
- Encryption of intrasite communications links is not recommended. An access
controlled physical environment with protected and shielded communciations
distribution systems is assumed.
Standard protocols (TCP/IP/LAN) are used for communications. Protocol stack is as shown below:
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