无线电干涉测距的抗多径性能研究

Research on Anti-multipath Performance of Radio Interferometric Ranging

为提高无线电干涉测距(RIR)在室内等多径环境中的实用性,建立RIR距离估计的多径误差模型。分析多径误差与系统参数的关系,并在2种不同的室内多径环境中利用通用软件无线电外设N210对RIR的测距性能进行实验评估,发现多径误差与系统参数的关系存在门限效应。实验结果表明,当测量带宽增加到160 MHz、频率个数为40时,RIR的均方根误差下降到1 m左右,显示了RIR在室内环境下的可行性和应用潜力。

In order to improve the practicality of Radio Interferometric Ranging （RIR） in severe multipath environments, a model of multipath-induced error in range estimation is established and the influence of system parameters on multipath errors is investigated accordingly. It is revealed that there is a threshold effect in the relationship between multipath errors and system parameters. The ranging performance of RIR is evaluated with universal software radio peripheral N210 software radio platform in two different indoor scenarios. Experimental results indicate that the root mean square errors of RIR are reduced to about 1 meter as measurement bandwidth hits 160 MHz and the number of frequencies arrives at 40, verifying the feasibility and potential of RIR in indoor environments.