基于改进mesh网络的大容量电子货架标签系统设计

发布时间：2018-02-24 14:34

本文关键词： mesh网络改进路由协议大容量网络后台管理系统电子货架标签　出处：《河南师范大学》2016年硕士论文　论文类型：学位论文

【摘要】：无论是在单位面积超过3000平方米的大卖场里,还是单店规模在300平方米左右的超市里,商品标价牌在各类规模的超市商品销售领域中都有大量的应用需求,可以及时更新商品的价格明细、保质期、条形码,明确打折促销信息等等,极大程度的方便了顾客的购物需求。传统的商品标价牌皆为纸质制作,虽然成本较低,但是在管理维护方面存在很多的弊端,尤其是在超市规模较大,商品种类较多,更新需求较为频繁的时候,需要大量的人力物力去跟进,且极容易由于疏忽或者信息传递不到位,出现错标,漏标的情况,一方面可能损害公司利益,让公司形象大打折扣,另一方面将影响顾客的购物体验。货架标签的发展和改进经历了非常漫长曲折的阶段。最先投用在电子货架标签系统上的是RFID(射频识别技术),通过阅读器-服务器-发送指令的过程来对各类商品信息进行更新改动并且保存,这种方法存在很多弊端,组网系统容易崩溃,且成本太高。在后期的发展中,逐渐使用MCU(微控制单元)来代替上述技术中阅读器的作用,这样使得读写更加方便,同时利用ZigBee技术可以设置不同的睡眠模式来控制功耗,减小成本,但是缺点在于容易掉网,且一旦有掉网故障的话,不容易被发现解决,针对上述两种技术所存在的种种弊端,本文旨在设计一套基于mesh网络的大容量电子货架标签系统,该系统不但具备自动实时更新价码信息的功能,而且具有节点众多、网络容量大的特点,同时搭建的网络自组网修复能力很好,完全可以满足商场对电子货架标签系统的各项要求。本文先通过对各种短距离无线通信技术的优缺点进行比较分析,选定ZigBee技术作为组建无线网络的主要技术,然后对市场主流芯片的参数比较选定CC2530f256作为主要芯片,选定IAR Embedded Workbench 8.1.0相对应的协议栈Z-Stack 2.5.1来进行配套使用。其次对软件和硬件进行设计分析,提出系统的总体设计结构,采用路由协议的改进方法后,对网络的参数RSSI(接收信号强度)、LQI(信号连接质量)等参数进行性能测试和验证,首先通过在一定区间测出RSSI(在0-28之内)与接收功率之间的实际关系,并且在得到两者之间的关系后,用Origin(函数绘制软件)进行数据处理,最后得出实际测得数据与理想改进网络之后数据基本相吻合,从而验证改进之后的网络接收强度有所提高;第二步通过在分析一定区间内实际测出LQI与接收功率之间的关系,同样同Origin函数绘制软件进行数据处理验证得出实验结果的优越性;第三步用Sniffer(抓包软件)来测试实际所接收到的数据帧、误码率、丢包率,通过对比理想数据曲线与实测数据曲线拟合关系,最终验证了实验结果已经达到预期目的。在文章的结尾提出工作总结与不足之处,展望下一步发展的方向和目标。
[Abstract]:Whether in a large store with a unit area of more than 3000 square meters or a supermarket with a single store size of about 300 square meters, there is a large demand for price tags in the field of commodity sales in supermarkets of all sizes. It can update the price details, shelf life, bar code, clear discount promotion information and so on, which greatly facilitates the customer's shopping demand. The traditional price tag is all made on paper, although the cost is relatively low. However, there are many disadvantages in the management and maintenance, especially when the supermarket is large in scale, there are many kinds of commodities, and the demand for renewal is more frequent, it needs a lot of manpower and material resources to follow up. Moreover, it is very easy for the company to be negligent or because the information transmission is not in place, so that the wrong mark or missing mark will appear. On the one hand, it may harm the interests of the company and greatly reduce the company's image. On the other hand, it will affect the customer's shopping experience. The development and improvement of the shelf label has gone through a very long and tortuous stage. The first used in the electronic shelf label system is RFID (radio frequency identification technology), through reader and service. Device-the process of sending instructions to update and change all kinds of commodity information and save it. There are many disadvantages in this method, the networking system is easy to crash, and the cost is too high. In the later development, MCU (micro-control unit) was gradually used to replace the function of reader in the above technology, which makes reading and writing more convenient. At the same time, using ZigBee technology can set up different sleep modes to control power consumption and reduce the cost, but the disadvantage is that it is easy to lose the network, and once there is a network failure, it is not easy to be found and solved. The purpose of this paper is to design a large capacity electronic shelf label system based on mesh network. The system not only has the function of automatically updating the price code information in real time, but also has the characteristics of numerous nodes and large network capacity. At the same time, the repair ability of the self-organizing network is very good, and it can completely meet the requirements of the electronic shelf label system. Firstly, the advantages and disadvantages of various short-range wireless communication technologies are compared and analyzed in this paper. ZigBee technology is chosen as the main technology to build wireless network, and then CC2530f256 is chosen as the main chip to compare the parameters of mainstream chips in the market. The protocol stack Z-Stack 2.5.1 corresponding to IAR Embedded Workbench 8.1.0 is selected for matching use. Secondly, the software and hardware are designed and analyzed, the overall design structure of the system is put forward, and the improved routing protocol is adopted. The performance of the network parameters RSSI (received signal strength and LQI) is tested and verified. Firstly, the actual relationship between RSSI (within 0-28) and receiving power is measured in a certain range. And after getting the relationship between the two, the original (function drawing software) is used to process the data. Finally, it is concluded that the actual measured data basically coincide with the data after the ideal improved network, so as to verify the improved network receiving strength has been improved; In the second step, the relationship between the LQI and the received power is measured in a certain interval, and the superiority of the experimental results is verified with the data processing software of the Origin function rendering software. The third step is to test the actual data frame, bit error rate and packet loss rate by using sniffer. by comparing the fitting relationship between ideal data curve and measured data curve, At the end of the paper, the author puts forward the summary and deficiency of the work, and looks forward to the direction and goal of the next development.
【学位授予单位】：河南师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN873;TN92

【相似文献】