嵌入式web service食品安全智能监测节点关键技术研究

发布时间：2018-07-12 07:58

本文选题：食品安全 + 嵌入式系统　；参考：《上海海洋大学》2014年硕士论文

【摘要】：食品安全问题是关系到人类生存发展的重要课题，近年来，频繁发生的食品安全事件造成了不良的社会影响，提高食品安全监测管理信息化、智能化水平已经迫在眉睫。食品流通涉及到食品生产、加工、运输、贮藏、销售等多个环节，食品每个环节都会受到外界温度、湿度以及微生物群等环境因素的影响，逐渐以一定的速度和方式丧失其原有品质。评价食品的品质不仅需要了解食品的初始状态，，而且需要根据食品的环境变化实时动态地评估与预测。本文从食品安全实时监测、安全状态评估和预测网络的实际特点出发，综合运用物联网技术、web service技术等探讨基于食品安全监测的智能化解决方案。设计并实现一种基于嵌入式web service技术的食品安全智能监测节点，区别于传统意义上的以条码或RFID标签为基础的食品安全溯源系统，本文食品安全智能监测网络具有实时监测影响食品品质的环境因素，并对食品品质的当前状态进行评估和预测进一步的安全状态的能力。本文首先对食品安全智能监测网络的关键技术进行深入的分析，提出了食品安全智能监测网络的总体架构，设计并实现了智能监测节点的硬件平台。智能监测节点的主控芯片采用集微处理器和射频功能于一体的CC2530F256，控制外围模块以及温度数据信息的采集、处理和发送等。其他外围模块包括日历时钟、液晶显示、蜂鸣器报警等，用以实现显示、查询、超出阈值时自动报警等功能。然后，为满足大范围内多智能监测节点灵活接入互联网的需求，克服通常意义下RFID系统点对点通信模式的不足，本文在智能监测节点上构建轻量级网络协议栈。鉴于实际应用中智能监测节点数量庞大的特点，IPv4的32位地址空间无法满足智能节点关于IP地址资源的需求，下一代网络通信协议IPv6具有巨大的地址空间以及无状态自动配置、良好的移动性支持等特点，是大范围内多智能监测节点灵活接入互联网的完美解决方案。但由于智能监测节点底层采用IEEE802.15.4协议，无法直接将标准的IPv6协议栈运行在智能监测节点上。因此，本文在深入研究IPv6、6LoWPAN的标准草案之后，依托Contiki操作系统设计一种智能监测节点的轻量级IPv6网络协议栈，完成智能监测节点与应用主机间端到端的通信，最终实现智能监测节点与IPv6网络间的无缝融合。最后，在研究REST架构风格和web service本质特征基础之上，将REST架构风格的设计思想引入到智能监测网络中，提出一种嵌入式智能监测节点的轻量级web service架构，将智能监测节点提供的若干服务抽象为资源，为智能监测网络的实现提供一种轻量化的实现途径。文中最后在智能监测网络的平台上完成对智能监测节点与IPv6网络的互通性、智能监测节点轻量级web service架构的测试与验证。结果表明，实现了智能监测节点与IPv6网络间的无缝融合，通过统一的访问接口，能够完成对智能监测节点数据资源的可视化访问。文中最后对本文所做的工作进行总结，并对下一步工作提出展望。
[Abstract]:Food safety is an important issue related to human survival and development. In recent years, frequent occurrence of food safety incidents has caused bad social impact, and it is imminent to improve the information of food safety monitoring and management. Food circulation involves food production, processing, transportation, storage, sales and so on. Each link will be affected by environmental factors such as temperature, humidity and microorganism, and gradually lose its original quality in a certain speed and way. Evaluation of the quality of food needs not only to understand the initial state of the food, but also to evaluate and predict the food in real time according to the changes in the food environment.
This paper, starting from the real time monitoring of food safety, the safety status assessment and the actual characteristics of the forecast network, comprehensively uses the Internet of things technology, web service technology to discuss the intelligent solution based on food safety monitoring, and designs and implements a kind of intelligent monitoring node of food safety based on Embedded web service technology, which is different from the traditional idea. As a food safety traceability system based on bar code or RFID label, the food safety intelligent monitoring network can monitor the environmental factors that affect the quality of food in real time, and evaluate the current state of food quality and predict the ability of further safety.
This paper first analyzes the key technology of the intelligent monitoring network for food safety, puts forward the overall framework of the intelligent monitoring network for food safety, designs and implements the hardware platform of the intelligent monitoring node. The main control chip of the intelligent monitoring node adopts the CC2530F256 which integrates the microprocessor and the radio frequency function to control the peripheral modules. And the collection, processing and sending of temperature data. Other peripheral modules include calendar clock, liquid crystal display, buzzer alarm and so on, which can be used to realize display, query, automatic alarm and other functions when the threshold is beyond the threshold.
Then, in order to meet the need of flexible access to the Internet in a large range of multi-intelligent monitoring nodes and overcome the shortcomings of the point to point communication mode of the RFID system in the usual sense, this paper constructs a lightweight network protocol stack on the intelligent monitoring node. In view of the large number of intelligent monitoring nodes in the actual application, the 32 bit address space of the IPv4 can not be full. The requirement of IP address resources for the foot intelligent node, the next generation network communication protocol IPv6 has a huge address space, a stateless automatic configuration, good mobility support and so on. It is a perfect solution for the flexible access to the Internet in a large range of multi-intelligent monitoring nodes. However, the IEEE802.15.4 association is adopted at the bottom of the intelligent monitoring node. The standard IPv6 protocol stack can not be run directly on the intelligent monitoring node. Therefore, after studying the draft standard of IPv6,6LoWPAN, this paper designs a lightweight IPv6 network protocol stack of intelligent monitoring nodes based on Contiki operating system, and completes the communication between the intelligent monitoring node and the end to end of the application host, and finally realizes the intelligence. It can monitor seamless integration between nodes and IPv6 networks.
Finally, based on the study of REST architecture style and the essential features of web service, the design idea of REST architecture style is introduced into the intelligent monitoring network, and a lightweight web service architecture for embedded intelligent monitoring nodes is proposed. Some services provided by intelligent monitoring nodes are abstracted as resources, and the implementation of intelligent monitoring network is provided. A lightweight approach.
At last, the intercommunication between intelligent monitoring node and IPv6 network is completed on the platform of intelligent monitoring network, and the lightweight web service architecture of intelligent monitoring node is tested and verified. The result shows that the intelligent monitoring node and the IPv6 network can be fused seamlessly, and the number of intelligent monitoring nodes can be completed through a unified access interface. Finally, the paper summarizes the work done in this paper and forecasts the next step.
【学位授予单位】：上海海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TS201.6;TP393.09

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