基于多传感器与WiFi融合的室内定位方法

Method of Indoor Position Based on Multi Sensor and WiFi

针对室内定位精度不高的问题,通过融合多惯性传感器定位技术和WiFi定位技术,提出一种基于多惯性传感器和WiFi定位结合室内定位方法。首先使用基于WiFi的室内定位中的RSSI算法,根据位置指纹、利用最近邻匹配算法获得绝对位置信息,再通过基于三轴加速度传感器与陀螺仪的步数检测方法以及基于电子罗盘与陀螺仪的航向估算方法获得相对位置信息。最后基于位置指纹的方式对多传感器的室内定位进行步长校正,得到较为准确的定位结果。实验结果表明,该方法与单独运用惯性传感器或单独使用基于WiFi的室内定位方法相比,精度更高。

Aiming at the problem that the indoor positioning accuracy is not high enough, an indoor positioning method based on the combination of multiple inertial sensors and WiFi positioning is proposed by fusing the multi sensor positioning technology and WiFi positioning technology. Firstly, using RSSI indoor positioning algorithm based on WiFi, according to the nearest neighbor matching algorithm to obtain the absolute position information by using location fingerprints. Secondly, the detection the number of steps through three axis accelerometer and estimate the course of steps through gyroscope and the electronic com- pass to obtain the relative position information. Finally, the step length of the multi sensor indoor positioning method is correc- ted based on the location fingerprint method. The experimental results show that the proposed method is more accurate than u- sing inertial sensor or the indoor positioning method based on WiFi alone.