应急手持终端设计与实现

发布时间：2018-04-26 23:37

本文选题：应急通信 + 嵌入式系统　；参考：《电子科技大学》2012年硕士论文

【摘要】：随着世界各地频繁出现地震、海啸、恐怖袭击、传染性疾病等各种自然灾害和大型公共事件，使国家和人民生命财产遭受重大损失，为达到有效地组织灾害救援急需一个快速响应、全面高效的应急宽带无线通信系统。应急手持终端作为应急宽带无线通信系统的组成部分，对应急通信系统的发展具有十分重要的意义。本文的目标是开发出一个界面友好、实用性强、便于功能拓展和维护、适合抢险救灾使用环境、满足应急指挥使用需求的应急手持终端。本文首先分析了应急通信系统的需求及现有系统的不足，提出了既能满足应急通信需求又能解决现有系统不足的应急宽带无线通信系统网络模型，并确定了基于该网络模型的应急手持终端的研究思路和方向。然后，按照项目管理的要求，进行了应急手持终端的需求分析，并通过业务种类整理和实际使用环境分析，整理出应急手持终端的技术指标，以嵌入式系统的理论为基础，根据技术指标进行了软硬件方案设计，进而完成了硬件电路及系统引导程序的详细设计。其间，对处理器及相关存储器、显示接口、USB接口、以太网接口、无线网络、GPS模块、电源管理等电路的硬件设计做了详细阐述，针对各种外围设备与接口的使用特点分别提出了相应的节能措施，对处理器软件的启动过程、Nand Flash坏块管理机制及引导程序的定制与移植做了详细说明。最后，，对系统进行了功能测试，通过利用处理器的节能模式、提高外围器件集成度、降低器件工作电压、分布式供电、优化电源管理等方法的运用，有效地解决了高性能与低功耗、小体积的矛盾，开发出了一个用户交互性能良好、功能实用、支持软件升级、能满足当前需求的应急手持终端。在本文的研究中，在系统的方案设计、低功耗设计等方面做了较多工作，收到了比较好的效果。本文主要开发的部分包括应急手持终端软硬件方案、硬件详细设计及处理器启动引导程序的设计。
[Abstract]:With the frequent occurrence of earthquakes, tsunamis, terrorist attacks, infectious diseases and other natural disasters and large-scale public events around the world, the lives and property of countries and people have suffered great losses. In order to effectively organize disaster relief, an emergency broadband wireless communication system with rapid response and high efficiency is urgently needed. As an integral part of emergency broadband wireless communication system, emergency handheld terminal is of great significance to the development of emergency communication system. The goal of this paper is to develop an emergency handheld terminal with friendly interface, strong practicability, convenient function expansion and maintenance, suitable for emergency rescue and disaster relief environment and meeting the needs of emergency command. This paper first analyzes the demand of emergency communication system and the deficiency of existing system, and puts forward a network model of emergency broadband wireless communication system, which can not only meet the need of emergency communication but also solve the shortage of existing system. The research idea and direction of the emergency handheld terminal based on the network model are determined. Then, according to the requirements of project management, the requirement analysis of emergency handheld terminal is carried out, and the technical index of emergency handheld terminal is sorted out through the sort of service arrangement and practical use environment analysis, which is based on the theory of embedded system. The hardware and software are designed according to the technical specifications, and the hardware circuit and system boot program are designed in detail. In the meantime, the hardware design of processor and related memory, display interface and USB interface, Ethernet interface, wireless network GPS module, power management and so on are described in detail. According to the characteristics of various peripheral devices and interfaces, the corresponding energy saving measures are put forward, and the mechanism of bad block management and the customization and transplantation of boot program of processor software are explained in detail. Finally, the function of the system is tested. By using the energy saving mode of the processor, the integration of peripheral devices is improved, the working voltage of the device is reduced, the distributed power supply is distributed, the power management is optimized and so on. It effectively solves the contradiction between high performance and low power consumption and small volume, and develops an emergency handheld terminal with good user interaction performance, practical function, software upgrade, and can meet the current needs. In the research of this paper, more work has been done in the system scheme design, low power design and so on, and good results have been obtained. The main part of this paper includes the hardware and software scheme of emergency handheld terminal, the detailed design of hardware and the design of boot program of processor.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN92;TP368.1

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