基于ARM的短波通信控制板软件设计

发布时间：2018-06-23 19:49

本文选题：短波 + TI-TM4C129　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：在现代通信技术日新月异的背景下,结合第三代短波通信技术和现有的短波收发设备,实验室展开了短波自动选频与建链系统研究。课题初始,实验室选取了基于ATSAM9263型ARM单元板和WinCE嵌入式操作系统结合的短波通信控制板设计方案,但在项目的进行中,发现WinCE系统内核的实时性不满足本项目的要求。新的设计方案选取了新的ARM单元板,并摒弃了WinCE操作系统,采用裸机的方式进行开发。本文从通信控制板底层接口、协议和控制软件的设计展开,作者主要的工作和成果概述如下：1.根据系统需求,确定了ARM平台下采用裸机形式开发的短波通信控制板设计方案。分析了原有的基于WinCE系统的短波通信控制板的不足,由于通信系统采用同步的建链方式,对站点间时间的同步性要求比较高,经测试,WinCE系统并不能很好的支持系统完成建链工作。鉴于此,本文提出了基于TI-TM4C129型ARM芯片的短波通信控制板设计方案,采用裸机的形式进行开发,新的开发方式可以很好的满足协议对实时性的要求。2.设计并实现了通信控制板上各外设的接口软件。根据系统的功能需求,在裸机工作方式下,设计并实现了通信控制板相关外设的接口软件。系统涉及到的外设主要包括通用定时器、串口、以太网和RTC实时时钟,其中,通用定时器为建链协议的状态跳转提供定时功能,控制板与Modern、收发信机以及GPS模块等采用串口进行数据交互,与用户终端采用以太网进行数据交互,而RTC实时时钟模块为同步的建链协议提供时间基准。这些模块是系统协议和控制软件运行的基础。3.设计了基于TI-TM4C129的通信控制板软件的总体架构,实现了通信控制板与系统其它模块的接口软件,实现了基于短波3G-ALE技术的通信控制协议。系统其它模块主要包括Modem、收发信机和系统终端,通信控制板和各个模块之间都有相应的接口协议,通信控制板通过对各个模块发送不同的命令使其完成相应的功能。系统的通信控制协议主要包括建链协议、链路质量分析(LQA)协议和更频协议。建链协议完成系统在不同状态下的链路建立,LQA协议可以对系统工作频段的链路质量情况进行实时分析,更频协议负责系统在信道条件恶化时在新选取的频率组上重新建立链接,它们协作完成通信链路的建立和维护。4.结合实验室研发的短波综合模拟设备,搭建了系统的测试平台,在室内测试条件下,给出了系统各个功能模块的测试结果。测试结果表明通信控制板的各通信控制协议均工作正常、和各模块的接口软件工作正常,相关外设的接口软件也很好的完成了对通信控制协议的支持,最后分析验证了软件设计的正确性。
[Abstract]:Under the background of the rapid development of modern communication technology, combined with the third generation shortwave communication technology and the existing shortwave transceiver equipment, the laboratory has carried out the research of shortwave automatic frequency selection and chain building system. At the beginning of the project, the design scheme of shortwave communication control board based on ATSAM9263 arm unit board and wince embedded operating system was selected. However, in the course of the project, it was found that the real-time performance of wince system kernel could not meet the requirements of the project. The new design scheme selects the new arm unit board, and abandons wince operating system, and adopts the naked machine way to develop. This paper starts with the design of communication control board interface, protocol and control software. The author's main work and achievements are summarized as follows: 1. According to the requirement of the system, the design scheme of shortwave communication control board based on arm platform is determined. The shortage of the original shortwave communication control board based on wince system is analyzed. Because the communication system adopts synchronous chain building mode, the synchronization of time between stations is very high. After testing wince system can not support the system to complete the chain building work. In view of this, this paper proposes a design scheme of shortwave communication control board based on TI-TM4C129 arm chip, which is developed in the form of bare machine. The new development method can meet the real-time requirements of the protocol very well. The interface software of each peripheral device on the communication control board is designed and implemented. According to the function requirement of the system, the interface software of the communication control board is designed and implemented under the bare machine working mode. The peripheral equipment involved in the system mainly includes general timer, serial port, Ethernet and RTC real-time clock, in which universal timer provides timing function for state jump of build chain protocol. The control board interacts with modern transceiver and GPS module using serial port and Ethernet with user terminal while RTC real-time clock module provides time reference for synchronous chain building protocol. These modules are the basis of system protocol and control software operation. The overall architecture of communication control board software based on TI-TM4C129 is designed. The interface software between communication control board and other modules of the system is realized, and the communication control protocol based on shortwave 3G-ALE technology is realized. Other modules of the system mainly include Modem, transceiver and system terminal, communication control board and each module have the corresponding interface protocol, the communication control board by sending different commands to each module to complete the corresponding functions. The communication control protocols include chain building protocol, link quality analysis (LQA) protocol and more frequency protocol. Chain building protocol completes the link establishment in different states of the system. The LQA protocol can real-time analyze the link quality in the operating frequency band of the system, and the more frequent protocol is responsible for re-establishing the link on the newly selected frequency group when the channel condition deteriorates. They cooperate in the establishment and maintenance of communication links. Combined with the short-wave synthetic simulation equipment developed by the laboratory, the test platform of the system is set up, and the test results of each function module of the system are given under the condition of indoor test. The test results show that each communication control protocol of the communication control board works normally, and the interface software of each module works normally, and the interface software of the related peripheral equipment also completes the support of the communication control protocol very well. Finally, the correctness of the software design is verified.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925

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