【作者】 程阵；

【导师】 胡庆新；

【作者基本信息】 合肥工业大学 ， 信号与信息处理， 2010， 硕士

【摘要】 无线传感器网络直接感知客观世界,改变了人类与自然界的交互方式。然而由于无线传感器网络应用系统所采集的数据必须与节点自身相对应才有意义,所以定位已经成为传感器网络应用中最为关键的技术之一。同时,随着低成本、低功耗的ZigBee技术的兴起,基于ZigBee的无线传感器网络越来越受到关注。本文将基于ZigBee技术无线传感器网络定位系统作为研究的主要内容。首先,本文在查阅大量参考文献的基础上,对无线传感器网络定位技术的研究背景、国内外研究现状和ZigBee协议栈进行了介绍,综述了无线传感器网络定位技术的相关理论知识,并把基于RSSI的无线传感器网络定位算法作为本文研究的重点。其次,在通过对现有定位算法优缺点、无线电损耗模型、以及RSSI测距和影响RSSI因素的分析,并通过对两种算法模型分析的基础上,提出了一种基于高斯模型的优化RSSI的算法。该算法可以有效地抗干扰,提高定位精度。本文详细地描述了定位算法实现流程,并通过实验进行了验证。最后,本文设计了一个低功耗、高性价比的无线传感器网络定位系统,实现了无线定位与有线通信的有机结合,并运用在实际的应用中,得出了实验结论,并分析了目前存在的问题以及下一步的工作展望。本文提出的定位方案有效降低了干扰、非视距等因素的影响,提高了定位精度,并在远距离通信时有效降低传输的不稳定性,在实际应用中取得了良好的效果。更多还原

【Abstract】 Wireless sensor network ,which directly perceived the objective world ,had changed the way that humans interact with the natural world. However, it was only meaningful that the data collected by wireless sensor network applications must be correspond to the node itself, so localizaiton had become one of the most critical technologies of sensor network applications. Meanwhile, with low-cost, low power ZigBee technology rising, Wireless Sensor Networks based on Zigbee was a growing concern.The paper made WSN localization system based on Zigbee as the main content of it.Firstly,this paper introduced the background and status quo of WSN localization,as well as ZigBee communication protocol and discussed about the theory concerning WSN localization on the basis of the study of a lot of related literatures. The signal strength based localization technology was made as the main point of this paper.Secondly, A kind of optimizing RSSI algorithm based on Gaussian models was brought forward in the paper after the analysis of the advantages and disadvantages of the localization algorithms in existence,wireless loss model,RSSI ranging and the factors that affected the RSSI ,as well as the analysis of the two algorithm models. The algorithm could effectively anti-jam and improved localization accuracy. This paper described the localization algorithm process detaily and verified it through experiments.Finally, The paper designed a low-power, high performance localization system for wireless sensor networks which realized the combination of wireless location and cable communications. The localization methods mentioned above was applied in the system to get the location results. The paper analyzed the present problems as well as the next step prospect.The localization method given by this paper reduced the influence of the interference, non line of sight, etc to improve the localization accuracy and reduced the instability of transmission in the long-distance communication. The localization system ran in a good condition in the real application.更多还原