High reliability in spacecraft computer systems

J. A. Edwards
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引用次数: 2

Abstract

One approach to high reliability in spacecraft computer subsystems is to provide layers of redundancy, fault tolerance through detection and recovery circuitry, coupled with radiation hardening. The additional circuitry required for high reliability can significantly increase the size, weight and power consumption of the subsystem. Today's spacecraft are smaller and cannot afford the added power and weight or cost of traditional redundant computer subsystems. The high reliability systems that depend on 38510 grade 1 electrical parts are often too expensive. To keep the computer subsystem power, weight and cost to a minimum, the computer could be based on an application specific integrated circuit (ASIC) intensive architecture. With internally redundant ASICs, the computer subsystem can be kept to a minimum size, weight, power while still achieving low cost. Additional features, such as error detection and correction (EDAC) on both the address and data busses, and triply redundant voted control lines add significantly to the reliability of the computer subsystem. Often the computer can easily meet the mission reliability requirements using either all 38510 grade 2 electrical parts or a mix of grade 1 and 2 parts, which greatly reduces system cost.<>
航天器计算机系统的高可靠性
航天器计算机子系统高可靠性的一种方法是通过检测和恢复电路提供冗余层、容错层以及辐射硬化。高可靠性所需的额外电路可以显著增加子系统的尺寸、重量和功耗。如今的航天器体积更小,无法承受传统冗余计算机子系统所增加的功率、重量或成本。依赖于38510 1级电气部件的高可靠性系统通常过于昂贵。为了使计算机子系统的功率、重量和成本降至最低,计算机可以基于专用集成电路(ASIC)密集型体系结构。通过内部冗余的asic,计算机子系统可以保持最小的尺寸,重量,功耗,同时仍然实现低成本。其他功能,如地址和数据总线上的错误检测和纠正(EDAC),以及三冗余投票控制线,大大增加了计算机子系统的可靠性。通常,计算机可以很容易地满足任务可靠性要求,使用所有38510 2级电气部件或1级和2级部件的混合,这大大降低了系统成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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