| Ground station, which fulfills infusing navigation message and time synchronization and so on, is a key part and control center of satellite navigation system. Ground station system software mainly fulfills monitoring all equipments in station and controlling the navigation system running. The function of all hardware equipments in ground station is implemented by assistance of software.The software requirement, characteristic, particularity, commonness are analyzed basing on the main station and time synchronization infusing station in BeiDou system. A software design method which is common to lots of ground station software is given.Firstly, some advantages and useful design rules on object-oriented design are introduced. The concept and utilities of design pattern is summarized.Then, the concept of ground station system software is given and the commonness of the software is summarized basing on the actual software functions.1) A software running frame is offered which can be well used in the system software designing.2) A multi-equipment-management design pattern is presented. With this design pattern, the interfaces of management is unified, the differences of operations between equipments or subsystems is shielded, which let the management of equipments or subsystems convenient and efficient.3) Two communication modes between the software and the equipments or the subsystems are presented. To each mode the corresponding software implementation method is offered.4) A data structure namely ring buffer which is suitable to processing data sent by the equipments or subsystems is given. Based on ring buffer's FIFO logic structure, data push, pop and existence of valid data frame is defined, which makes the storage, read operations on the communication data and the various protocol are combined organically.Last, the abroad application and the application effect of the design methods in several ground stations system software are described in detail. |
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