无线图像传感器网络数据采集与可靠性传输研究

发布时间：2018-03-22 01:32

本文选题：无线图像传感器网络　切入点：图像传输　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：无线图像传感器网络通过自组网方式进行图像数据采集和无线传输。通过集成化的微型图像传感器对环境信息进行感知和采集,把采集的图像信息通过无线方式进行发送,并以自组多跳的网络方式传送到汇聚节点,实现用户对环境的监测与控制。无线图像传感器网络被广泛应用于环境监测、智能家居、医疗健康等领域。论文主要针对无线图像传感器网络的数据采集与数据可靠性无线传输两个方面进行研究。首先考虑到图像传感器节点的功耗、处理能力、体积等因素,提出了具有休眠机制的图像传感器节点的系统方案。通过分析图像传感器节点各个模块(图像传感器模块、嵌入式微控制器模块、无线通信模块、能量供应模块)的指令系统和工作机制,实现对图像采集的指令控制以及对图像采集过程的系统控制,最后将采集的图像数据通过无线方式传输至汇聚节点。通过对比其他短距离无线通信技术,论文选取Zigbee协议作为无线通信方式。由于无线信道的复杂性,需要提出有效措施保护图像数据在无线信道中可靠传输。通过对现有无线通信可靠机制以及真实系统环境的分析,针对Zigbee网络层重传机制数据传输的脆弱性,论文提出一种基于Zigbee应用层的高效型重传与返回确认机制。论文首先分析与测试了Zigbee网络层重传机制的数据传输,由于Zigbee网络层数据重传机制过多的时间消耗导致数据传输混叠和数据重复接收问题,进而提出了Zigbee应用层数据传输设计。设计中针对汇聚节点接收图像数据情况,提出三种不同的响应机制(ACK、数据重复接收、Busy)提高数据的处理能力,并且根据汇聚节点不同的响应机制,图像传感器节点做出相应的数据发送机制,从而提高数据无线传输的可靠性。本文针对Zigbee网络层数据传输和Zigbee应用层数据传输两种方式,进行了不同最大重传次数的数据传输与时间消耗、数据丢包率关系的测试。实验结果表明,相对于Zigbee网络层数据重传机制,Zigbee应用层设计的数据传输机制显著缩短了重传机制消耗的时间,并且.提高了数据传输的可靠性。
[Abstract]:Absrtact: wireless image sensor network is used for image data acquisition and wireless transmission through ad hoc network, and environmental information is sensed and collected by integrated micro image sensor. The collected image information is transmitted by wireless mode, and transmitted to the convergent node by self-organizing multi-hop network, which realizes the user's monitoring and control of the environment. Wireless image sensor network is widely used in environmental monitoring, smart home, wireless image sensor network (WSN) is widely used in environmental monitoring and smart home. Health care and other fields. This paper mainly focuses on the data acquisition and data reliability wireless transmission of wireless image sensor network. Firstly, considering the power consumption, processing ability, volume of image sensor node, etc. The system scheme of image sensor node with dormancy mechanism is put forward, and each module of image sensor node (image sensor module, embedded microcontroller module, wireless communication module) is analyzed. The command system and working mechanism of the energy supply module, the command control of the image acquisition and the system control of the image acquisition process are realized. Finally, the collected image data is transmitted to the convergence node through wireless mode. By comparing other short-range wireless communication technologies, this paper selects Zigbee protocol as the wireless communication mode. It is necessary to propose effective measures to protect the reliable transmission of image data in wireless channels. Through the analysis of the existing reliable wireless communication mechanism and the real system environment, the vulnerability of the Zigbee network layer retransmission mechanism data transmission is pointed out. In this paper, an efficient retransmission and return verification mechanism based on Zigbee application layer is proposed. Firstly, the data transmission of Zigbee network layer retransmission mechanism is analyzed and tested. Because too much time consumption of Zigbee network layer data retransmission mechanism leads to the problem of data transmission aliasing and data receiving repeatedly, the design of Zigbee application layer data transmission is put forward, and the image data is received by the convergent node in the design. In this paper, three different response mechanisms (ACKs) are proposed to improve the data processing capability. According to the different response mechanisms of the convergent nodes, the image sensor nodes make the corresponding data transmission mechanism. In order to improve the reliability of wireless data transmission, this paper deals with the data transmission and time consumption of different maximum retransmission times for Zigbee network layer data transmission and Zigbee application layer data transmission. The experimental results show that compared with the data retransmission mechanism of Zigbee network layer, the data transmission mechanism designed by Zigbee application layer significantly shortens the time consumed by the retransmission mechanism and improves the reliability of data transmission.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP274.2;TN929.5;TP212.9

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