The Research On Real-time Technology Of Middleware In Joint Test Platform And Its Extension On Service

In recent years,with the development of information technology,especially computer network technology,joint test technology based on LVC(live,virtual and constructive)has been widely used in military research.As one of the core facilities of the distributed test system,the middleware can provide high-performance,real-time and low-delay information transmission environment between test resources,realize interconnection and interoperability of test resources,and provide guarantee for coordinated operation of the entire system.In the existing Jo int Test Platform(JTP)middleware,the information transmission performance is difficult to meet the requirements of some strong real-time application scenarios,and there is a lack of on-demand ownership transfer of object instances and data filtering mechanisms of interest in the basic services.In view of the above problems,this project intends to study the middleware real-time technical solutions and related service extension methods in order to improve the function of the existing joint trial platform middleware and improve its information transmission performance.The details are as follows:Analyze the operating principle of existing middleware and the factors that affect transmission performance.Design and develop new high-precision,strong real-time JTP middleware based on the limitation that existing middleware can only run in non-real-time operating system.By studying the architecture and working principle of the Real-time Extension(RTX)real-time system,the RTX real-time agent module and the unified service interface API are designed to support system management in the operating system layer and physical layer using the classical RTX+reflective memory mechanism.Claim management,object management and time management services;at the middleware layer,the Chord algorithm in the distributed hash table technology was studied,and the resource discovery mode under the high volatility of the joint trial system was designed,which reduced the search overhead and improved Information transmission efficiency.Study the ownership arbitration mechanism in distributed simulation system,introduce the ownership transfer technology in high-level architecture(HLA)into JTP middleware,extend the ownership management service,and design the ownership of “push” and “pull” modes.Arbitration solves the problem that existing middleware cannot share object instances,and improves the resource sharing and security control capabilities of the multi-field multi-resource joint test process.Research data distribution algorithm which is based on publish/subscribe system,and take content filtering theme mechanism which is in data distribution service(DDS)into middleware service,extend data distribution management service module,according to the operation principle of middleware of joint experiment platform and multi-dimensional data Domain requirements,a specific SQL filter is designed,and a universal method for filtering expressions of interested data is proposed to reduce the network load under high-frequency information interaction.Tested the RTX real-time middleware and the joint experimental platform extension functions.By verifying the transmission delay of middleware,it shows that RTX real-time middleware improves the real-time performance of the system;by verifying the functional integrity of the ownership management and data distribution management module,It shows that the software functions normally and the performance is stable.