【正文】 ements an indoor location system based on WiFi for mobile user with Android handset. A locating arithmetic based on WeightSelect 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 maxweighted location or the minRSSIdistance among them will be selected as the estimated position. According to experiments, 4metre 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 4 頁 共 40 頁 目 錄 第一章 緒 論 ......................................................................................... 6 關(guān)于位置信息確定的意義及方法 .......................................................... 6 位置信息確定的意義及方法 ....................................................... 6 本文主要介紹的定位系統(tǒng) ........................................................... 7 本文的主要研究內(nèi)容以及各章安排 ...................................................... 7 主要內(nèi)容 ....................................................................................... 7 本文安排 ....................................................................................... 7 第二章 目前主要定位方式及各種測量方法 ................................................... 7 GPS 定位系統(tǒng)介紹 ................................................................................. 8 的發(fā)展 ................................................................................... 8 GPS 國內(nèi)外動態(tài) ........................................................................ 10 wifi 定位技術(shù) ........................................................................................ 11 wifi 的利用原理 ......................................................................... 11 定位需要兩個(gè)先決條件 ............................................................. 12 定位運(yùn)用的各種測量方法 .................................................................... 12 通過傳播時(shí)間測量方法 ............................................................ 13 信號衰減測量方法 ..................................................................... 13 改進(jìn)的 TOA 算法 ...................................................................... 13 本章總結(jié) ................................................................................................ 14 第三章無線定位系統(tǒng)和物聯(lián)定位系統(tǒng)的介紹 ................................................. 14 無線定位系統(tǒng)方案 ................................................................................ 14 系統(tǒng)方案 ..................................................................................... 14 特點(diǎn)與指標(biāo) ................................................................................. 16 LocateSYS 物聯(lián)定位系統(tǒng) .................................................................... 17 系統(tǒng)概述 ..................................................................................... 17 工作原理 ..................................................................................... 18 特點(diǎn) 與指標(biāo) ................................................................................. 18 產(chǎn)品資料 ..................................................................................... 19 第 5 頁 共 40 頁 應(yīng)用領(lǐng)域 ..................................................................................... 21 本章總結(jié) ............................................................................................... 21 第四章 基于 WiFi 的室內(nèi)定位系統(tǒng)設(shè)計(jì)與實(shí)現(xiàn) ............................................. 21 系統(tǒng)設(shè)計(jì) ................................................................................................ 21 系統(tǒng)的實(shí)現(xiàn) ............................................................................................ 23 客戶端設(shè)計(jì) ................................................................................. 23 . Activity 生命周期 ..................................................................... 24 ．獲取周邊 AP 信號強(qiáng)度 ......................................................... 25 程序流程 ............................................................................................... 26 . 服務(wù)端軟件設(shè)計(jì) .................................................................................. 27 . Web 服務(wù)器 .............................................................................. 27 . 定位服務(wù)器 ............................................................................... 28 ............................................................................ 28 . 2 算法描述 .................................................................................... 31 . 3 算法分析 .................................................................................... 31 4. 7 實(shí)驗(yàn) ....................................................................................................... 32 . 1 實(shí)驗(yàn)過程 .................................................................................... 32 . 實(shí)驗(yàn)結(jié)果 ................................................................................... 33 . 總結(jié) ...................................................................................................... 33 致謝 ..................................................................................................................... 34 參考文獻(xiàn) ............................................................................................................. 35 第 6 頁 共 40 頁 第一章 緒 論 關(guān)于 位置信息確定的意義及方法 位 置信息確定的意義及方法 位置信息在人們的日常生活中扮演著重要的作用。定位算法運(yùn)行于 服務(wù)端，客戶端為配備 WiFi 模塊的 Android 手機(jī)。經(jīng)實(shí)驗(yàn)測試，此系統(tǒng)在 4 米范圍內(nèi)具有良好的 定位效果。 第 1 頁 共 40 頁 本 科 畢 業(yè) 論 文 題 目 基于 wifi 的室內(nèi)定位系統(tǒng) 設(shè)計(jì) 學(xué)生姓名 XX 學(xué) 號 X 專 業(yè) 電子信息工程 班 級 X 指導(dǎo)教師 XX 2022 年 4 月