星载软件均为嵌入式软件,中断是星载软件与外界进行信息交互的重要接口,中断的响应是否及时对星载软件的性能有着较大的影响；且由于星载软件的实时性要求,中断处理的延迟可能会导致软件功能性错误,无法完成正常的功能,而且该错误随机性较强,难以定位；中断响应时间是衡量一个星载软件对外部中断处理的及时性的重要参数,文中说明了如何对软件进行最大中断响应时间的分析,为星载软件中断处理的设计提供参考;文中给出两个实例,分别介绍在允许中断嵌套和禁止中断嵌套的情况下,中断响应时间的具体分析方法,经过分析得出结论,示例1中断处理余量仅5.63％,无法进一步提升性能,示例2中断处理余量为86.38％,系统还有较大的扩展空间.%Now all the onboard software is emebedded software, the interruption is an important interface of onboard software. It can effect the performance of the software whether the software handles the requestion of interruption as soon as possible. And because of the requirement of realtime of the onboard software, the delay of interruption handling can bring an error of software function, and it is difficule to look for the error. The performance of emebedded software can be estimated through maximal-response-time. In this paper, a method of measuring and analyzing the time is introduced, and it can be refered to in the design of interruption of onboard software. Two examples are given, and the inner of interruption is enabled in the first example and disabled in the second example. The surplus of the first example is 5. 63 percent, so the performance of the system can not be improved. But the surplus of the second example is 86. 38 percent, therefore the performance can be improved greatly in the system.
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