摘要:随着WiFi技术的快速发展，无线城市的建设，WiFi技术在各个行业的应用掀起一股热潮。无线定位服务需求在定位市场的迅速发展下不断增长，也为WiFi技术的进一步发展提供了机遇。医疗行业中重症病人的跟踪监护，贵重医疗设备监控；商场购物车定位，顾客消费习惯收集；监狱重点犯人跟踪；出行路线导航，实时位置查询服务等应用都需要定位技术的支持。由于GPS卫星定位具有需要在相对空旷、高层建筑不密集的地方才能比较精确的定位，而且在建筑物受墙体遮挡无法使用，在一些场合应用受到限制。因此利用广泛存在的WiFi网络，对处于楼群密集或者室内目标进行定位成为可行的技术选择。通过WiFi网络进行定位，可以弥补GPS在建筑物密集或者室内应用的限制，扩大定位服务的应用行业和范围，提高定位精度，降低部署成本，提高设备利用率，增强应对突发事件的求援能力，具有重要的社会意义。

　　　本文研究了基于WiFi的无线定位技术及其基本原理，着重介绍了基于信号强度的定位技术（RSSI）的特点，重点分析了在WiFi网络中实施的基于RSSI的定位技术的实现方法。本文在以上知识的基础上，设计并开发了一个基于WiFi定位技术的算法软件，描述了在实验环境下对系统的测试以及测试结果，并对测试结果进行精确度分析。本文的最后对课题取得的成果进行了简单的总结，并指出系统还存在的问题，并根据本课题现在的研究成果进行了展望。

关键词  WiFi；定位系统；RSSI

Abstract:With the development of WiFi technology and Wireless City，WiFitechnology is widely used in various industries，so that it also provides opportunities for it to improve.Similarly，inlocation-based services market，the demand for location based services grows rapaidly.For example，the healthcare industry，emphasis on patient care tracking，anti-steal the baby delivery room，expensive medical equipment monitoring and control，shopping cart positioning ，customer spending habits of collection；prison inmates focus tracking；travel route navigation，real-time location of inquiries.As the GPSsatellite positioning，it can provide precisely positioning only where relatively open，none high-rise buildings，can’t be used indoors and it has higher power consumption.Therefore，in intensive indoor positioning targets，positioning system based on WiFi technology become the best choice．Through the WiFinetwork location，it can make up for GPS in the construction—intensive or indoor applications，restrictions and expand the application of location—based services industries and range，and improve positioning accuracy，reduce deployment costs，improve equipment utilization，enhance rescue capabilities to respond to emergencies has importantsocial significance.

　　　Here we talked about the WiFi technology and learn the basic principles，focusiong on the wireless positioning technology based on RSSI.Based on the above konwledges we designed and implemented the fuction of this positioning system.In the lab environment and a brief analysis of the results.The final chapter briefly summarize the obtained results and pointed out that the function not yet been achieved ，and make a futute based on tht research results of this subject.

Keywords  WiFi   location system   RSSI