基于手机的声学超宽带室内定位

Ultra-wideband Indoor Acoustic Positioning Based on Mobile Phone

针对室内定位技术部署复杂、成本高的问题,提出了一种利用手机接收声学信号通过脉冲压缩进行室内定位的方法。通过借鉴雷达系统中的脉冲压缩技术,将信号和噪声分离,并提取出信号到达时延估计。为了减小定位误差,研究了手机的声学特性,设计了声学超宽带信号的信道模型,将应答节点时延回传,进一步减小信号传播的时延估计。在停车场的试验结果表明:定位结果和实际位置相符,平均定位误差在30 cm以内。

In view of the problem of high cost and complex deployment in indoor positioning technology,anindoor positioning method is presented which uses a mobile phone to receive acoustic signal by pulse compression. According to the pulse compression technology in radar system,signal and noise is separated,andthe signal arrival time delay estimation is extracted. In order to reduce the positioning error,the acousticchannel model of ultra-wideband（UWB）signal is designed according to the acoustic features of mobilephone,and node time delay is feedback to further reduce the signal propagation time delay estimation. Thetest in parking lots show that the positioning result is consistent with actual position and the average positioning error is within 30 cm.