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Research on the Technology of Enhancing the Reliability of On-board Computer Based on the Dynamic Loading Mechanism

Author: YuKang
Tutor: NingHong
School: National University of Defense Science and Technology
Course: Computer Science and Technology
Keywords: Board computer Reliability Dynamic loading VxWorks operating system
CLC: TP311.52
Type: Master's thesis
Year: 2009
Downloads: 82
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Abstract

Spaceborne computer is performed on the spacecraft Star Service management, the central state control, data processing and other functions. As embedded systems work in the complex environment of space, compared with the general ground embedded systems, both designed by the basic constraints on the quality and power of the entire spacecraft, but also because of the temperature difference between the working environment, radiation, failure occurs higher probability of failure is difficult to maintain away from the ground, must therefore seek higher reliability. In general, the board computer failure was mainly due to the irradiation in space, and thus commonly used electronic components and redundant structure of the anti-radiation protection hardware design. In recent years, however, directly reinforced with high-performance, low-cost COTS (Commercial off-The-Shelf, commercial off-the-shelf products) chip board computer design has become a new trend. Dynamic loading mechanism is a widely used operating system software is loaded, it will be applied and the required code base separation, only when need only be loaded from the file system object code, to achieve run-time load. In this paper, through dynamic loading mechanism, on the one hand, to solve the problem-board computer with limited storage resources, on the other hand, as one of the systems technology, the spaceborne computer failure detection and recovery mechanisms to provide a range of support, especially for COTS a chip soft reinforcement technology supporting recovery mechanism to solve the single event upset caused by the transient fault detection and recovery. This paper studies the work includes the following aspects: (a) analysis of the reliability needs of the board computer and embedded operating system in the dynamic loading technology features, explore use dynamic loading enhanced board computer reliability ways; (b) by analyzing the needs of the spaceborne computer software system design, based on modular software system architecture dynamically loaded module management, and one of the key technologies were discussed. (C) VxWorks source of dynamic loading mechanism, modify the VxWorks dynamically loaded several strategies designed and implemented a dynamic module management system, complete module information management, increase user query and configuration capabilities loaded . (D) Based on the dynamic module management system, support the the module reload Single Event Upset Recovery technology to support the system restart recovery module automatically loaded technology, and enhanced system scalability module dynamic replacement and the task dynamic management technology. Finally, we discuss two dynamic loading support dynamic hardware detection and device fault tolerance reliability enhancement programs. (E) the design module instance, on the one hand, to verify the correctness of the dynamic module management system, on the other hand by their corresponding scenarios to test and analysis, the implementation of several techniques that effectively enhance board computer reliability.

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