基于一次反射的室内WiFi辐射源单站定位方法

Single station localization of indoor WiFi emitter with multipath exploitation

摘要:

为了解决WiFi外辐射源雷达现场应用中首先需要实时获取室内辐射源位置的问题，通过详细分析室内环境中信号的反射方式和特性，利用一次反射信号建立了WiFi辐射源测量的到达时间差(TDOA)模型，并分析推导出辐射源坐标求解方程。对于该非线性方程，先利用Taylor展开在初值处将其线性化，然后利用高斯牛顿迭代法估计辐射源坐标，且具有较快的收敛速度。仿真分析表明其所提算法可实现室内辐射源定位，且因方程线性化带来的精确度损失可通过迭代得到快速补偿。

Abstract:

In the field application of WiFi external radiation source radar, the location of the indoor radiation source needs to be acquired in real-time. Through detailed analysis of the reflection mode and characteristics of the signal in the indoor environment, the first reflected signal is adopted to establish the Time Difference Of Arrival(TDOA) model of the WiFi radiation source measurement, and the equation is solved by deriving the coordinates of the radiation source. For this nonlinear equation, Taylor expansion is first employed to linearize it at the initial value; and then Gauss-Newton iteration method is adopted to estimate the radiation source coordinates, which has a faster convergence rate. Simulation analysis shows that the proposed algorithm can realize positioning of indoor radiation source, and the accuracy loss caused by the linearization of the equation can be quickly compensated by iteration.