Research On The Key Technologies In Multi-Level Parallel And Distributed Real-Time Simulation Platform

As the scale and performance of the real-time simulation applications are increasing, the simulation environment, that is more powerful, and more cosmical, is needed. In the building of the real-time simulation platform, the reusability, expansibility and standardization are the important issues. Under the requirement, the Multi-Level Parallel and Distributed Real-Time(PDRT) simulaiton platform is researched. The development of the real-time simulation platform, based on the DSP(Digital Signal Processor), has more advantage than the general computer in computing stability, time managmeny precision and communication speed. The frame time that the platform can supply is a few microsecond, so it can satisfy with the requriment of signal simulation. Based on the research of the traditional simulation platform, we propose the four level architecture for the design of the simulation platform, and emphasize on the development of the platform based on DSP.The dissertation first analyzes the restriction relationship of the real-time simulation platform. From view of the simulaiton platform development, the performance standard of the real-time simulation platform and the characteristic of signal real-time simulaiton are analyzed. Based on the analyse, the delamination idea for the design of the real-time simulation platform is proposed. Based the hardware, software and model, the platform is leveled with non-real-time level, soft real-time level, hard real-time level and rigorous real-time level, and especially analyzes the rigorous real-time level.Based on the research of the level architecture, the regorous real-time simulation level is designed and developed using DSP. Firstly, the regorous real-time simulation level with one DSP is researched. Through the test, the advantage in computing stability and communication ability, comparing with the general computer, is proved. Furthermor, in order to improve the ability of the regorous real-time simulation level, the dissertation researches the relationship between the communication ability and the speedup of Multi-DSP. The basic principle is introduced for designing the regorous with Multi-DSP. In the end, the multi-DSP regorous real-time level, based on the three-level memory structure, is designed, and called Super Node(SN). Based on the SN, the different extended styles are introduced.Then, based on the hardware of the platform, the dissertation discusses the Time Management to promise the control of the time, especially researches the time controlling in the regorous real-time level. In order to satisfy the time required, by analyzing the GPS clock error and combing the charateristics of the GPS-PPS signal with the high precision oscillator, strategy for correcting both error of the GPS-PPS and the oscillator is introduced. As the GPS-PPS is free from cumulative error, and the high precision crystal oscillator is free from random error, each error can be revised by each other. Using the high precision simulaiton clock, the Timer Synchronization Start-Up(TSSU) and the Quasi-Homologous Clock Synchronization(QHCS) are proposed to satisfy the time requirement in the regorous real-time level.Following this, in order to improve the efficiency of the platform with satisfying the performance requirement, the dissertation researches scheduling strategy in multi-level PDRTS platform. Based on the description of formalization, the static scheduling strategy first is desibussed. By analyzing the charateristics of the platform, a new static scheduling called MLEL(Multi-Level Equivalent Load), that improved on GA and IP's weakness in tasks assemble, is proposed. Tests conducted on the same platform proves that the new strategy can effectively improve the ability of platform. For remedying the windage in the obtaining of static conditions and enhancing the correcting ability, the dynamic sheduling strategy, based on the task replicate(TR), is proposed to eliminate the state delay along with the freezing state. In the platform, the static and dynamic sheduling strategy are combined to ensure the executing effectively.At last, this dissertation introduces the design and realization of the overall platform. Based the study of the key technologies, a prototype system is designed and implement. As a result, it validates the delamination idea for the real-time simulation platform, and the above-mentional key technologies are feasible to statify the requirement of the platform design, under a typical application of missile electronic prnetration simulation system. It shows the expandability, reusability and scalable of the platform.