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基于RSSI指纹的WiFi定位算法的位置估计精度受到线上阶段WiFi指纹匹配个数的影响。考虑到室内环境的复杂性,目前国内外学者多采用任意指定指纹匹配个数的策略。本文在室内环境下进行试验,提出了WiFi定位邻近指纹匹配点的最佳个数的确定指标,对常用的邻近点匹配个数的位置估计策略进行了比对分析。位置估计的可靠度检验和包围盒检验的结果表明,在单个房间的室内环境中,选取5~8个邻近点较为合理。
The accuracy of location estimation based on RSSI fingerprinting WiFi location algorithm is affected by the number of matched WiFi fingerprints in the online phase. Taking into account the complexity of the indoor environment, at present, scholars at home and abroad to use any number of fingerprints matching strategy. In this paper, experiments are carried out under indoor environment, and the determination index of the best number of matching points of WiFi fingerprinting near the fingerprint is proposed, and the location estimation strategies of matching number of adjacent points are compared and analyzed. The results of location estimation reliability test and bounding box test show that it is reasonable to select 5 to 8 adjacent points in the indoor environment of a single room.