Design And Implementation Of Embedded Task System Simulator

System simulation is 40 years since the late 20th century, along with the development of computer technology, and gradually form a new discipline. Simulation (Simulation) model is through the establishment of the actual system model using the actual system seen in the experimental study of the process. Initially, the simulation technique is mainly used in aviation, aerospace, atomic reactors, and other expensive, long cycle, dangerous, difficult test the actual system a few areas, then the progressive development of electric power, petroleum, chemical, metallurgy, machinery and some other major industrial sector, and further extended to the social system, economic system, transportation system, ecological systems, the field of non-engineering systems. It can be said of modern system simulation technologies and integrated Simulation systems have become any complex system, especially the essential high-tech industry analysis, research, design, evaluation, decision-making and an important means of training. In expanding its scope of application, application efficiency is increasingly significant.The so-called system simulation, system analysis is based on the purpose, the nature of the elements in the analysis system on the basis of their mutual relations, the establishment of system structure or behavior can describe the process, and has a certain amount of logical relations or relations between simulation model accordingly test or quantitative analysis, to obtain all the information required for correct decision-making.Using some of the physical model and part of the mathematical model simulation. Physical model which uses the physical control system, the system itself is a dynamic process using mathematical models. Semi-physical simulation system is usually to meet the requirements of real-time simulation computer, motion simulator (generally use mechanical rotary axis), target simulator, and part of the physical composition of the console. Control system electronics and sensors placed on the turntable. Semi-high fidelity physics simulation, so the control system used to verify the correctness and feasibility of fault simulation and model development phase of the closed-loop dynamic control system acceptance test. In addition, with the spacecraft simulator to train astronauts and flight simulators used to train pilots but also the nature of a semi-physical simulation, which focuses more on visual modeling and human relations. Computer simulation model to achieve and to a computer or spacecraft control system electronic circuit for the kind of closed-circuit test can also be considered a semi-physical simulation, this simulation focuses on inspection and control of computer software for the accuracy or control certain functions in the and parameters. Semi-physical simulation fidelity depends on the amount of access to the physical components, computer simulation speed, accuracy and functionality, turntable and the target simulator performance. Usually mechanical rotary axis accuracy requirement is high, turning range, dynamic response and frame layout of the optical sensor does not obstruct the field of view. Semi-physical simulation technology is the modern control system simulation technology development priorities.With the current computer technology, control theory and information technology, simulation of the new technologies and new methods has been greatly developed, distributed simulation is a distributed simulation environment using a class of simulation. Distributed simulation environment is formed by the connection of multiple processor system, which uses distributed control hardware and software resources and management to support the harmonization of multiple sub-simulation task execution. But it also increases the size and development of the system difficult. In response to these problems, we propose a simulation system structure to a convenient and efficient ideas, in order to reduce development effort and accelerate development progress.In some specific areas, the simulation system stability and reliability with extremely stringent requirements, in the simulation due to equipment failure will interrupt the simulation process generated significant economic losses. Therefore, we have achieved the design and development of a backup system module, switch and module reconstruction, with a strong fault tolerance, improve system reliability simulator for embedded mission systems.Embedded task system emulator (hereinafter referred to as DVME) with main and backup dual-channel, enabling the backup system module, switch and module reconstruction, with a strong fault tolerance, improve system reliability. System with strong data processing capability, can be used for complex multi-tasking, with self-detection and redundancy management functions. Simple two parallel redundant system, when the primary channel fails to switch to a backup channel working. Main and backup channel synchronization. For system board-level reconstruction, when installed in the VME board a feature on the motherboard fails, replace the failed backup resources available to the board, to achieve system reconfiguration.System supports both single external input signal redundancy, by the way within the system were divided into 2 parallel input to the two redundant channels also support redundancy for each separate signal input channel (ie, the external input signal is more than two degrees) the two input control.