数字公交系统需求分析

1 引言..................................................................................................................................... .............2

1.1 编写目的.................................................................................................................................2

1.2 背景.........................................................................................................................................2

1.3 定义.........................................................................................................................................2

2 任务概述...................................................................................................................................... ....3

2.1 目标.........................................................................................................................................3

2.2 用户的特点.............................................................................................................................3

2.3 假定和约束.............................................................................................................................3

3.5 故障处理要求.........................................................................................................................7

4 运行环境规定.............................................................................................................................. ....8

4.1 设备.........................................................................................................................................8

4.2 接口.........................................................................................................................................8