Study And Implementation Of Hierarchical Federation Communities

With the continuous development of simulation technology, the scale and range of simulation application is becoming larger and larger.To utilize current simulation resource sufficiently, and to implement simulation application of larger scale in smaller cost ,multi-federations interlink technology has become one of the most hottest spots in distributed simulation domain. The key problems of this technology are to solve multi-federations inter-communication and to enhance the efficiency of multi-federations simulation system by decreasing the flow of information among multi-federations. Then we can implement combined simulation in multi-federations simulation system. Therefor, we should pay more attention to the Architecture of multi-federations simulation system, the algorithm on data mapping among Heterogeneous FOMs, the Time Manage algorithm in multi-federations simulation system and the six mangement services communication in Hierarchical Federation Communities, etc.This dissertation lucubrates and implements multi-federations interlink technology by studying relative literatures and tracing the new trends of international simulation development.The main job and creativity points in this dissertation are as the following:1) The dissertation analyzes and designs hiberarchy federations system architecture model. Mainly aiming at these existing problems: such as the problem that Federate Gateway doesn't s support HLA interface, the Bridge Federate aggravates burden on users , RTI Broker's API interface doesn't frame a uniform standard between RTIs,we design hiberarchy federations system architecture model. It is a DFP(Distributed Federate Proxy)architecture of tree shape, SN (Simulation Node) and DFPC (Distributed Federate Proxy Component) are the bridge which connects different federations. It solves the problems on multi-federation inter-communication efficiently ,makes the blance of load, vails simulation scale expanding, and adapts to the need of large scale simulation.2) The dissertation puts forward algorithm on data mapping between different FOMs. To solve interoperability problem in different federations, it aims at the characteristic of Hiberarchy Federations system architecture , defines the mapping relationship Rxy, and the Rxy satisfies both symmetry and recursion.the dissertation puts forward algorithm on data mapping between different FOMs -SFDMA algorithm based on analyzing the existing architectures and their problems.It utilizes struct array via searching mapping chain list,solves mapping problem on attribute or parameter of class among different FOMs effectively.3) The dissertation puts forward the computation methods of Greatest Available Logical Time (GALT) on hiberarchy federations. Time management service is one of the keystone and nodus, the key problem of the implementation of time management service is the computation of GALT. Aiming at the intrinsic relation between SN and DFPC, this dissertation provides the GALT computation formula on SN and DFPC, makes correctness validation, and analyzes the logical relationship of the time advancing among different nodes.4) The dissertation studys and implements Hierarchical Federation Communities six management services, and combines with HLA specification which complies with IEEE1516, it anatomises data flow on Federation management, Declaration management, Object management , Ownership management, Time management, and Data distribution management services, clarifies the principle on the system simulation running, implements all the functions of Federation management, Declaration management, Object management services. Through testing the functions of the implemented management services, it indicats that the capability of the system structure is steady, and it is capable of satisfing the need of large scale simulation.In the end, the main achievements of the dissertation are summarized and some further works are stated.