室内环境下无线干涉定位系统的多径误差分析

Multipath Error Analysis for Radio Interferometric Positioning System in Indoor Environment

无线干涉定位系统(RIPS)通过获得无线传感网络中节点的相位来实现对节点精确定位。介绍无线干涉定位算法,利用多径效应误差模型实现对RIPS定位结果的多径修正。构建RIPS室内定位仿真模型和硬件平台进行多径环境下的室内测距实验,结果显示实测误差远高于仿真误差。对此,从采样方式、反射系数和节点高度3个方面定量分析造成测距误差的原因。分析结果表明,采样方式、反射系数和定位节点高度设置是造成RIPS实际测量误差的主要因素,经过理论修正后测距误差可以降低87.61%。

Radio Interferometric Positioning System(RIPS)realize accurate positioning for nodes by obtaining the phase of nodes in Wireless Sensor Network(WSN).This paper introduces the principle of radio interference positioning algorithm,and uses the error model of multipath effect to perform the multipath correction for RIPS positioning results.A simulation model for indoor RIPS and the corresponding hardware platform are built for indoor ranging experiments in the multipath environment.The results show that the measured error is much higher than the simulation error.Aiming at this,the causes of ranging errors are quantitatively analyzed from the perspectives of the sampling method,reflection coefficient and node height.The analysis results show that the sampling method,reflection coefficient and the setting of positioning node height are the major factors of errors in the actual measurement of RIPS,and the ranging error can be reduced by 87.61%after theoretical correction.