基于软件总线的小卫星系统软件可重用结构设计

The Reusable Architecture Design Based on Software Bus for Small Satellite On-board System Sofware

提出了一种小型探测卫星系统软件的可重用性结构设计方法。为实现可重用性，软件结构采用了模块化策略，各任务模块间相互通信采用了“软件总线”概念。软件总线为每个任务模块提供一个简单的标准化数据通信接口，因此对某一星载系统任务模块的修改或增加或替换时不影响其它任务模块，同时某些场合，通过从地面上实时地改变软件总线上的调度表内容的方法，很容易改变卫星的工作状态。在星载系统软件软件开发周期内，各任务模块通过软件总线功能可独立编程、检测及在星计算机上装入。这种软件结构设计方法对多任务小型探测卫星具有良好的应用价值。

This paper presents a method of the design of a reusable architecture for the on-board system software used on the smallexplorer satellite .This paper concentrates on the modular aspects of the software architecture that have allowed it to be reused for anothermissions. Software requirements are assigned to tasks in a way that concentrates the mission specific requirements into two or more tasks.This allows most tasks to be reused with little or no modification. Inter-task communication is handled by a 'software bus ', which gives avery simple,data-driven interface to each task. The software bus intorface allows individual tasks to be modify or replaced without affectingthe other tasks. Tasks can be comPiled,linked,tested,and downloaded to the hardware independentiy during the development cycle .ThissoftWare architCcture has proved to be cost effective for multi-mission satellites.