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介绍WLAN定位系统SWALLOW的设计与实现.本系统对WLAN中携带定位卡的人员或设备实施定位,考虑到定位卡的成本与能耗,本系统采用接入点而非定位卡收集RSSI值.而各接入点对定位卡同一信号的RSSI测值往往存在缺失和不同步,因此传统的基于点的RSSI特征比对算法稳定性不好.本系统使用了一个新的基于区域的定位算法,该算法在最小信号距离比对的初步结果上,通过在生成树上寻找最近公共祖先的方法实现平滑.分析和实验表明,该算法能将静止定位稳定度从50%提高到95%,并保持90%以上的移动定位准确度和10s以下的延时.目前,SWALLOW系统已应用到资产管理系统中.
This paper introduces the design and implementation of WLAN positioning system SWALLOW.The system locates the personnel or equipment carrying the positioning card in the WLAN.With the cost and energy consumption of the positioning card, the system uses the access point instead of the positioning card to collect the RSSI value. Therefore, the stability of RSSI feature matching algorithm based on point is not good at all, so the RSSI measurement value of each access point to the same signal of the positioning card often lacks and is not synchronized.This system uses a new location-based localization algorithm, The algorithm achieves smoothing by finding the nearest common ancestor on the spanning tree in the preliminary result of the minimum signal distance alignment.The analysis and experiments show that the proposed algorithm can increase the stability of the rest orientation from 50% to 95% and maintain 90% % Of the mobile positioning accuracy and delay of less than 10s.Currently, SWALLOW system has been applied to the asset management system.