【作者】 张弛；

【导师】 周春月；

【作者基本信息】 北京交通大学 ， 电子与通信工程（专业学位）， 2017， 硕士

【摘要】 随着无线传感器技术的快速发展,功能丰富、品类繁多的无线传感器产品已逐渐融入人们的生活。为了解决无线传感器的定位问题,出现了众多高精度、低功耗、低成本的定位技术。但在如今移动互联网大潮中,利用手机终端对无线传感器进行定位的解决方案却始终不太理想。这些解决方案通常直接在无线传感器中装载卫星定位模块,或者只允许手机终端在处于无线传感器信号覆盖范围内时对其进行定位。这两种方式中,前者提高了无线传感器模块的成本和功耗,后者则应用范围较窄。本文针对上述问题,基于iOS平台设计和实现了一套高效、便捷、低成本、低能耗的无线传感器定位系统。该系统以智能手机iPhone作为控制终端,以低功耗蓝牙模块作为定位目标,根据二者是否处于可连接范围,采用基于蓝牙的RSSI测距或基于云服务器的Crowd-GPS技术两种方式,实现对目标无线传感器的定位追踪。论文主要研究内容和创新点如下:(1)基于对无线传感器定位、iOSAPP开发、服务器开发等相关技术的分析和研究,完成了基于iOS平台的无线传感器定位系统的设计和实现,包括移动客户端、无线传感器和云服务器三大部分的开发与配置。(2)采用苹果公司基于蓝牙4.0低功耗技术发布的软硬件创新技术iBeacon,和基于蓝牙的RSSI(Received SignalStrength Indication,接收的信号强度指示)测距技术,实现了 iPhone与无线传感器在可连接范围内时对无线传感器的定位功能。(3)针对iPhone与无线传感器不在可连接范围内的情况,采用了 Crowd-GPS(人群GPS)的设想,将所有用户均视为Crowd-GPS中的"侦察兵",每当用户移动时都将自己所探测到的无线传感器"位置情报"上传至云服务器。通过这种方式,云服务器可以持续更新和保持所有无线传感器的最新位置信息,当某用户需要寻找自己遗失的无线传感器时,只要向云服务器发起请求即可。本文从理论上分析了该技术的可行性,并在设计中实现了 Crowd-GPS定位技术。最后论文从稳定性和实用性两方面对基于iOS的无线传感器定位追踪系统进行了测试,从测试结果来看,系统的各部分运行正常,实现了设计预期的目标。更多还原

【Abstract】 With the rapid development of wireless sensor technology,feature-rich and wide range of wireless sensor products have gradually integrated into people’s lives.In order to solve the problem of wireless sensor positioning,there have been many high-precision,low power,low-cost positioning technology.But now in the mobile Internet tide,the use of mobile terminals on the wireless sensor positioning solution is always not wishfull.These solutions typically place the satellite positioning module directly in the wireless sensor,or only allow the mobile terminal to position the target when it is within the coverage of the wireless sensor signal.In both cases,the former improves the cost and power consumption of the wireless sensor module,while the latter has a narrow range of applications.To solve this problem,a set of efficient,convenient,low-cost,low-power wireless sensor positioning system that can locate low power Bluetooth module based on the iOS operating system is designed and implemented in this paper.The system uses the iPhone as a control terminal to location the low-power Bluetooth module.In addition,the smart phone can use the RSSI ranging or Crowd-GPS technology to locate the wireless sensor depending on whether the smart phone and the target wireless sensor are within the reachable range.The main research contents and innovations are as follows:(1)Completed the design and implementation of the wireless sensor positioning system based on iOS operating system,including the configuration and development of the mobile client,wireless sensor and cloud server.At the same time,the wireless sensor,iOS development,server development and other related technologies were analyzed and studied.(2)Combined with RSSI distance measuring and Apple’s new iBeacon technology to achieve locating wireless sensors using iPhone within the scope of the connection.(3)For the situation of iPhone and the wireless sensor is too far away from each other to be connected,this paper shows the idea of Crowd-GPS.That is,smart phones are regarded as "scouts",whenever the smart phone moves their own detected wireless sensor positioning "intelligence" will be uploaded to the cloud server.And when a user needs their own wireless sensor location information,they could just make a request to the cloud sever because the cloud server will keep all the latest wireless sensor device location information.This paper analyzes the feasibility of the Crowd-GPS technology in theory,and then achieve the Crowd-GPS positioning technology in the design.This Wireless sensor positioning system can meet people’s daily needs.And it’s very suitable for the positioning of people(such as the elderly,children),seeking items(such as keys,wallets),even bicycles,car parking location tracking and other daily needs.Now with the mobile Internet era of rapid growth,smart phones have been gradually popular in people’s life.The design is based on mobile applications,and the system’s scope of application and market prospects are very broad.更多还原