本 科 毕 业 论 文
题 目
基于wifi的室内定位系统
摘 要
本文设计及实现了一个基于 WiFi 射频信号强度指纹匹配的移动终端定位系统，并设计实 现了一种基于权重值选择的定位算法。该算法为每个扫描到的 AP 的 RSSI 设定了选择区间，指 纹库中落在此区间的所有位置点设平均权值， 最后选取权重值最大者为待定位点的位置估计， 如 有相同权重值，则比较信号强度距离，取最小者，这种算法在一定程度上克服了 RSSI 信号随机 抖动对定位的影响，提高了定位的稳定性和精度。经实验测试，此系统在 4 米范围内具有良好的 定位效果。可部署在展馆、校园、公园等公共场所，为客户提供定位导航服务。定位算法运行于 服务端，客户端为配备 WiFi 模块的 Android 手机。借助该定位系统，基于 Android 系统的移动终端可方便地查询自身位置，并获取各种基于位置服务。
关键词: 接收信号强度；无线室内定位；射频指纹；Android 操作系统
Abstract
This paper designs and implements an indoor location system based on WiFi for mobile user with Android handset. A locating arithmetic based on Weight-Select is introduced to filter the random noise of RSSI. For each location in Radio Map, a weight is set if the RSSI of the AP scanned is in the interval preset. Then max-weighted location or the min-RSSI-distance among them will be selected as the estimated position. According to experiments, 4-metre locating precision is available. It can be used for locating and navigating in such scene as exhibition center, campus, park, and so on. Users equipped with Android handset could get its location and some intelligent services. It is also an open and extensible system. Some locating arithmetic also could be tested on this system.
Key words: Received Signal Strength, Wireless Indoor Locating, Radio Map, Android Operating System
第一章 绪 论 .......................................................................................... 6
1.1关于位置信息确定的意义及方法 .......................................................... 6
1.1.1位置信息确定的意义及方法 ....................................................... 6
基于wifi的室内定位系统毕业设计论文
