Study On The Application Of Database Middleware To Space Ground-based Application System

With the development of aerospace industry in our country, there are more and more satellites managed in space ground-based application system. Existing single satellite management and control system has been increasingly unable to meet the requirement of user operation management. To construct multi-satellite integrated management and control system, and realize dynamic loading, business reconstruction and flexible extension of different types of satellites are the development trends of current satellite management and control system. Nevertheless, during the construction of multi-satellite integrated management and control system, in order to realize mission planning and scheduling coordination of many types of satellites, business software needs to access fundamental data in each heterogeneous database of existing single satellite management and control system, which brings great difficulty to business software development. Therefore, to design common data integration and access platform, realize data integration in underlying heterogeneous database of single satellite management and control system, and provide unified data access interface to business software have great theoretical significance and practical value in simplifying the development of system business software and speeding up the construction of multi-satellite management and control system.Many methods used in heterogeneous data integration at home and abroad are analyzed. The advantages of applying middleware method to heterogeneous data integration in satellite management and control system are pointed out. On the basis of detailed study on middleware. XML. Web Service technology and so on. the solution of database middleware based on XML technology is presented. With such advantages of XML as simplicity, self description and platform independence considered, and XML document used as middle layer, the transparent access of business software to heterogeneous database and data integration are implemented in multi-satellite management and control system.With the business features of space ground-based application system analyzed, the architecture of database middleware based on three-tier structure is designed according to sen;ice oriented idea. Two kinds of database middleware workflow are described. Middleware data schema mapping method is analyzed and designed. Each middleware software module is designed and implemented by the method based on Web Service and XML. and then deployed. Finally, with the test results of the middleware considered, its features and advantages are summarized.