星载实时微内核操作系统的CPU调度

现代小卫星的重要特点之一是要实现卫星的自主运行。作为其控制核心的星载自主计算机操作系统的性能至关重要。当今 操作系统的发展趋势是采用微内核体系结构。它具有微型化，模块化，可移植性可扩充性等优点。ＣＰＵ调度是影响操作系统性能的关键因素。当前的微内核操作系统基本上只提供几种简单的调度策略，如ＦＩＦＯ，循环反馈等。这些都难以满足卫星系统在特定的时间内对外界作出响应的实时要求。为此，本文设计了一个新的ＣＰ

CPU SCHEDULING IN SATELLITE REAL-TIME MICROKERNEL OPERATING SYSTEM

One of the most important features of modern minor satellites is to realize autonomous moving.The performance of the satellite autonomous computer operating system acting as the control center is of utmost importance.The recent trend in operating system development is adopting microkernel architecture which holds such advantages as microminiaturization,modularity,portability and extendibility.CPU scheduling is the key factor affecting the performance of operating systems.Existing microkernal operating systems only provide such simple scheduling policies as FIFO,Round Robin etc.which hardly meet the real time requirement that reacting to events originating in the physical world within a certain duration of time in satellite systems.In this paper,a new CPU scheduling model was proposed.Several advanced techniques such as the separation of mechanism and policy,object oriented and CPU inheritance etc.were adopted.It fully meets such requirements as high reliability,real time performance,efficiency and microminiaturization in satellite systems.