Distributed Collaborative Comprehensive Virtual Tests And Test Systems, Communications And Scheduling Research

With the lasting raising of Space-flight and aerial systematic complex and modern level, It rely on advanced experiment and test means increasingly to design, develop and defend space-flight and aerial system. And now, With the development of network technology and distributed calculate theory becoming perfect day by day, It is the good condition to develop Integrated Virtual Experiment and Measurement Technology. Incorporated with the tenth-five project-"IVEMT" of the Commission Of Science Technology And Industry For National Defence. The paper has analysized internal and external researching. Moreover, base on the former research wok , the technology of communication and management, as the problem of key technology of the Integrated Virtual Experiment And Measurement System(IVEMS), is studied thoroughly in this thesis.In this thesis, in order to satisfy the real-time requirement of the distributed experiment and measurement system, the property and characteristics of the distributed system based on Ethernet are analyzed at first. Then, some existing communication methods are compared. Finally, according to the requirement that the transparent data must be exchanged interactively on space-flight and aerial distributed experiment and measurement system, the method that the distributed experiment and measurement system with the middle component of virtual shared memory is introduced, and its software wraps based on fast Ethernet, RPC and broadcasting data are developed.According to the character of multi-task and high real-time in IVEMS, the technique of management, fault tolerance and the synchrony of multi-line are discussed detailedly. In this paper, we achieve the technology of synchrony of multi-line.With the lasting development of Network and Database technology, the high level data integration in current application systems is needed; thiskindof indirect visiting way has brought many problems, To overcome these shortcomings, the open interface of data connection ODBC is used to visit data. In this thesis, the design thoughts and the usage of the software wraps that make a series of operations to data with interface has been discussed in detail.The actual use and analysis indicate that it can assure the transmitting accuracy of the data if the middle component of the virtual shared memory is adopted to realize the data communication in the distributed experiment and measurement system. Compared with some kindsof existing communication methods, it also can transmit data with high speed. Thus, it can meet the real time requirement of distributed systems, In this work, the database management system of distributed experiment and measurement system, which can visit various data through ODBC, is developed based on SQL Server. It not only real izes the distribution but also the high efficiency. All these have manifested that this work has very strong practical value and application prospect.