-
摘 要随着无线通信和定位技术的不断发展， 无线传感器网络已经成为热门研究课题，广泛应用于医疗器械、智能家具和工业生产等领域。ZigBee 技术和 IEEE802.15.4 一起构成无线传感网络的标准通信协议，ZigBee 技术与其他无线通信技术相比具有成本低、功耗低、可靠性高、组网容量大、时延小等优点。基于 ZigBee 设计的无线定位系统能够为用户提供所在位置的精确定位，如在火车站出口通过定位可以方便找到亲友； 在矿井中可以随时监测工作人员的人身安全；在地下停车场可以方便找到出口。因此无线定位系统在人们的日常生活中具有重要的应用。本文的主要研究内容如下：(1)采用与距离相关的定位方式，重点研究了基于 RSSI测距的方法。分析了基于 RSSI 算法的不足并进行了改进。通过 MATLAB 仿真对比两种算法，仿真结果表明，改进后的算法定位精度更高。(2)完成了整个系统的硬件设计，包括最小系统、射频模块、辅助电路、功能指示电路等。 硬件电路的核心芯片是 CC2530， 串口电路采用了 USB 连接方式。(3)软件设计部分完成了对ZigBee 协议栈的移植、定位节点软件的设计和协调器与 PC机通信设计,并以流程图的形式详细介绍了每部分软件运行的流程。37434
- 上一篇：铁路无线通信系统GSM-R越区切换设计+代码
- 下一篇：TD-SCDMA系统的码字优化设计
毕业论文关键词：定位系统 无线通信
ZigBee RSSIAbstractWith the development of wireless communication and localizationtechnology, wireless sensor network has become a hot research topic,widely used in medical devices, smart furniture and industrial productionand other fields. ZigBee technology and 802.15.4 IEEE constitute thestandard communication protocol of wireless sensor network, ZigBeetechnology and other wireless communication technology has theadvantages of low cost, low power consumption, high reliability, largenetworking capacity, small time delay.Based on the design of ZigBee wireless location system can toprovide users with the location of the precise positioning, for example byusing positioning technology you can easily find your relatives andfriends in the exit of train station; can monitor staff's personal safety inthe mine; can easily find the exit in the underground parking. So thewireless positioning system plays an important role in people's daily life.In this paper, we carry out the following areas of research and designbased on characteristics of ZigBee technology:(1)This paper designed a positioning system used distancedependent positioning, and focus on the ranging method based on RSSI.The paper analyzes the insufficient of RSSI algorithm and improves thisalgorithm. By comparison of the MATLAB simulation of this twoalgorithms , the improved algorithm is proved to have higher positioningaccuracy.(2) The paper also completes the hardware design of this wholesystem, including the smallest system, RF module, auxiliary circuit andfunction indication circuit.The main chip of this hardware circuit isCC2530, and the serial circuit uses USB connection module.(3) The part of software design completes the transplant of ZigBeeprotocol stack, coordinator design, location nodes and the communicationwith PC,and uses the form of a flowchart to describe the process of eachpart of the software.
Keywords: Localization System Wireless Communication RSSIZigBee
目 录
摘 要.I
Abstract.II
1 绪论.1
1.1 课题背景1
1.2 国内外研究与发展现状.1
1.2.1 几种不同的室内定位技术1
1.2.2 无线传感网络国内外研究现状2
1.2.3 无线定位的国内外研究现状3
1.3 论文的结构和内容3
2 ZigBee技术4
2.1 ZigBee 技术特点. 4
2.2 ZigBee 无线通信协议. 5
2.3 ZigBee 设备类型. 8
2.4 ZigBee 拓扑结构. 10
2.5 本章小结12
3 RSSI算法的改进. 13
3.1 RSSI算法原理.13
3.2 RSSI算法原理的实现.13
3.3 基于 RSSI定位算法的改进15