NBDP

Messages transmission module is that DSC / NBDP messages are received and processed .

报文传输模块：接收和处理DSC报文。

The traditional NAVTEX system works by NBDP , which cannot meet the requirements of the modern ocean shipping development .

传统的NAVTEX无线接入系统采用窄带直接打印（NBDP）的工作方式，功能单一、智能化程度低，已经不能适应现代航运发展的要求了。

In this paper , the design of NBDP and DSC simulators for GMDSS terrestrial communication system is presented : interactive user-interface , file text editor , field editor , communications operation procedure and display , and system configuration ;

该文给出了GMDSS地面通信系统模拟器的设计：包括NBDP和DSC的用户界面，文本编辑器，字段编辑器，通信过程，系统设置的模拟；

Then the components of NBDP equipment , encoding method , error correction technique and the two work mode ARQ and FEC are introduced respectively , in particular , the work principle and work process of ARQ and FEC in detail .

然后介绍了NBDP的设备组成、编码方式、检纠错技术和工作方式，特别对NBDP的两种工作方式即ARQ方式和FEC方式的工作原理和工作流程进行了详细阐述。