IETM database standardized on S1000D consists of XML documents. In view of former relational database treat XML documents defectively, design storage and index pattern of IETM database which is based on features of module and information object standardized on S1000D with relational XML database technology. There is a certain significance to broaden.

XML (eXtensive Markup Language) technology is the key technology in the development of Interactive Electronic Technical Manual (IETM) system. Focus on the analysis of the application of XML technology on current standardization and database of XML technology on the expert knowledge system.

Introduces 3D Max model making process and VRP software utilization in making virtual field shot system, through which it can roam each shot by arbitrary selection path. The virtual reality work of "Years as Song" is created by virtual reality technology showing creation method.

Correctly sorting the staggered pulse trains each station received is one of the key technologies in the location effect of multi-station time difference passive detection system. According to the problem of straight grid division and the difficulty in sorting two emitters with the same one-dimensional time difference in the histogram method, a time difference sorting algorithm based on natural clustering is proposed. Simulation results show that the algorithm can overcome the defects of histogram method above, and solve the pulse miss-sorting problem, offering better sorting results.

With the rapid development of computer software and hardware technology, 3D technology and virtual reality technology is acquiring a greater growing space. Three-dimensional virtual campus environment compared with the traditional two-dimensional campus graphics more intuitive, vivid, true-to-life. More convenient to operate, you can choose a different camera pan any, the viewpoint conversion, angle rotation.