一种联合式射频窄带信号时差估计方法

A Joint TDE Method for Narrow-Band RF signals

针对无源时差定位技术中的射频窄带信号时差估计,提出了一种基于离散小波变换、广义互相关、聚类分析的联合式射频窄带信号时差估计方法。本方法首先是以监测数据离散小波变换的低频系数为输入,基于广义互相关时延估计方法,提取射频窄带信号时差的估计初值;再以对多时段的时差估计初值为输入,通过聚类分析,得到空间射频窄带信号的时差估计终值。仿真表明:本文提出的方法具有良好的估计性能,射频窄带信号时差提取精度显著提高。

A time delay estimation（ TDE） method for narrow-band RF signals is proposed,which has potentials in passive localization applications. It is a multi-stage scheme,which is initialized by calculating the discrete wavelet transform（ DWT） coefficients of the measurements corresponding to the low frequencies,followed by estimating the TDE with the generalized cross-correlation（ GCC） algorithm,and is finalized by clustering the results. Simulations have demonstrated its superior performance compared with the classic methods.