RSSI位置指纹的定位误差分析与仿真

为了确立RSSI位置指纹定位技术中定位误差与影响其主要参数的关系,提出了表示定位平均误差的数学模型,通过计算整个定位区域误差的期望,公式化地表达了接入点个数、接入点摆放位置、采样点间距、最邻近点个数各因素取值不同对定位精度的影响.通过对实验数据的统计分析,仿真结果表明:接入点个数取4个可满足定位要求,当选择多于5个接入点实现定位时,可以不考虑接入点摆放位置,采样点间距取1 m可满足定位要求,K的取值对定位精度影响不明显.

Location Error Analysis and Simulation of Location Fingerprinting Technology Based on RSSI

In order to describe the relationship between the location error and the key factors which affect location error in location fingerprinting technology based on RSSI,a mathematical model for localization average error was proposed in this paper.Calculating the positioning error of the mathematical expectation of the targeted area shows how the number of access points,the distribution of access points,the grid spacing and the number of closer neighbors influence the positioning accuracy.An analysis of the experimental data shows that,when the number of AP takes four,the positioning requirements are satisfied,and when more than five points were selected to achieve positioning,the location of AP need not to be considered.The grid spacing of one meter can be taken to meet positioning requirements,and the value of K has little effect on the positioning accuracy.