公安系统内部基于Android室内Wi-Fi定位系统的设计与实现

发布时间：2018-11-20 18:37

【摘要】：随着移动技术的发展,移动终端定位技术越来越受到人们的青睐。在室外,移动基站,GPS等技术的发展使得定位技术越来越成熟并开始在人们的生活中扮演越来越重要的角色。而在室内,由于墙壁的阻隔,终端定位的精度急剧下降,更不用说定位建筑物内部的某个区域。常用的室内定位技术如红外线、超声波、蓝牙等需要额外部署大量的硬件设备。近年来,无线局域网技术获得了快速的发展,由于它强大的功能及其便捷性,在人们的日常生活中得到了广泛应用。由于无线局域网的普遍性,人们开始逐渐重视无线局域网在室内定位中的应用。本文描述的公安系统内部定位系统就是基于802.11b的无线网络构建的。本文根据Wi-Fi定位的基本思想提出了系统的设计方案。本系统的主要设计思想是根据移动设备的Wi-Fi指纹来确定终端设备的位置。首先,注册室内的各个AP(无线网络接入点)的信息;其次,在室内的多个采集点采集各个AP的RSSI(信号强度)作为采集点的指纹,我们称其为Wi-Fi指纹,然后将采集到的Wi-Fi指纹和采集点的位置信息存放入服务器;最后,当终端设备需要定位时,将终端的Wi-Fi指纹上传到服务器,服务器根据预先采集的数据判断出当前终端所处的区域。按照该系统的设计思想,我们实现了该室内无线定位系统。本系统由客户端和服务端两部分构成。服务器端程序是在Windows平台下进行开发,采用了多线程技术,会存储收集采集点的Wi-Fi指纹,并能根据终端的Wi-Fi指纹判断终端位置。而客户端程序是在Android平台下进行开发,能采集Wi-Fi指纹数据,与服务器交互,并显示定位区域。开发所使用的Android系统能保证定位系统得到广泛的推广。为了能够直观地看到软件的运行效果,我们选择AP较多的办公楼作为测试地点。首先,我们登记了主楼某一层中各个AP的信息;然后,在各个待测试的教研室内部署了各个数据采集终端,采集了定位系统所需的AP环境信息;最后我们在各个教研室内的不同位置进行定位实验。测试结果表明,该定位系统能较准确的定位出终端的位置,具有较好的实用性。
[Abstract]:With the development of mobile technology, mobile terminal positioning technology is more and more popular. Outside, mobile base stations, GPS and other technologies make the positioning technology more and more mature and begin to play a more and more important role in people's lives. However, because of the wall barrier, the accuracy of the terminal location drops sharply, not to mention the location of a certain area inside the building. Common indoor positioning technologies such as infrared, ultrasonic, Bluetooth and so on require a large number of additional hardware devices. In recent years, wireless local area network (WLAN) technology has gained rapid development, because of its powerful function and convenience, it has been widely used in people's daily life. Due to the universality of WLAN, people begin to attach importance to WLAN's application in indoor positioning. The internal positioning system of public security system described in this paper is based on 802.11b wireless network. According to the basic idea of Wi-Fi positioning, the design scheme of the system is put forward in this paper. The main design idea of the system is to determine the location of the terminal device according to the Wi-Fi fingerprint of the mobile device. First, register the information of each AP (wireless network access point) of the room; Secondly, the RSSI (signal intensity) of each AP is taken as the fingerprint of the collection point at several indoor collection points, which is called Wi-Fi fingerprint, and then the collected Wi-Fi fingerprint and the location information of the collection point are stored in the server. Finally, when the terminal equipment needs to locate, the Wi-Fi fingerprint of the terminal is uploaded to the server, and the server determines the region of the current terminal according to the data collected in advance. According to the design idea of the system, we realized the indoor wireless positioning system. The system consists of client and server. The server-side program is developed on the platform of Windows. The multithread technology is used to store the Wi-Fi fingerprint of the collection point and to judge the terminal position according to the Wi-Fi fingerprint of the terminal. The client program is developed on the Android platform, which can collect Wi-Fi fingerprint data, interact with the server, and display the location area. The Android system developed and used can ensure that the positioning system is widely popularized. In order to visualize the running effect of the software, we choose more AP office buildings as the test site. First of all, we register the information of each AP in a certain floor of the main building, and then deploy each data acquisition terminal in each teaching and research room to be tested, and collect the AP environment information needed by the positioning system. Finally, we carry on the localization experiment in the different position in each teaching and research department. The test results show that the positioning system can locate the position of the terminal accurately and has good practicability.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP311.52;TN92

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