探地雷达瞬态晚时响应开始时刻的估计方法

An Estimating Method for the Start of the Transient Late-time Response of Ground Penetrating Radar

为深入分析时域瞬态响应蕴含的目标特征信息,瞬态晚时响应开始时刻的估计成为近年来研究的热点。本文针对实际应用中一定条件下的浅埋目标体,从理论上推导了不同极化下,探地雷达早时响应中表面反射波的能量是相等的,以此确定加窗时刻的起始点;进而利用晚时响应中蕴含的极点收敛性,采用矩阵束方法进行极点估计,确定收敛最早的时刻为晚时响应阶段的开始点。以干沙环境下细长圆柱体的瞬态响应为例,数值仿真与实验结果表明,该方法能有效的分离出瞬态晚时响应。

In order to analyze the target feature information of GPR time domain transient backscatter response that is fo- cused in recent years, an estimating algorithm for the correct start of the late-time response is proposed in this paper. Ba- sing on that the energy of surface reflection at different polarization is equal in GPR early-time response stage for buried tar- get, the starting point of windowing function is determined. Estimating the pole series by Matrix Pencil Method and using poles convergence of late-time response, the earliest convergence time is the beginning of the late-time response stage. With the example of baekscattered response of the slender cylinder buried dry sand environment, the results of numerical simulation and experiments show that this processing method can separate late-time response effectively.