采用自上向下的模块化设计方法，将PDDC的功能划分为基本单元，实现这些功能模块并组成模块库。
Using Top-Down design method, the whole PDDC function is divided to many units implemented respectively and organized to the module library.
论文详细阐述了软件的设计与实现，包括通信，控制，功能模块化设计和数据库设计等。
The design and realize are introduced carefully in the paper, including communication, control, the design of functional module and database.
系统软件采用软件工程设计方法，实现程序结构化，功能模块化。
The system software USES the design of software engineering to realize the structurization of the program and the modularity of the functions.
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