基于雷达信号特征点提取的结构物埋深估算方法

为了克服经验法推算结构物埋深的缺陷,基于检测对象的雷达反射波形特征,通过提取反射波形上的少量特征点,提出一种估算结构物埋深的新方法,并考虑实际检测中结构物反射波形的畸变,对估算精度进行分析评价.结果表明:对于理想的无畸变检测数据,该方法对结构物埋深、水平位置及电磁波速的估算结果较为精确;当反射波形存在畸变时,该方法对埋深的直接估算结果误差较大,平均误差达到55.202％,但对于电磁波速的估算结果较为精确;对于实测的有畸变检测数据,可通过电磁波速估算结果及测得的目标体双程旅时对埋深进行间接估算,估算精度满足雷达法检测对埋深估算的要求.相比经验法,该方法在估算精度、误差控制方面具有显著优势.

Depth estimation of buried structures based on the GPR reflected waveform characteristics

To overcome the defects of the depth estimation of buried structures by the empirical method,a new method to estimate the depth based on the reflected waveform characteristics of buried targets was put forward by extracting few points from the reflected waveform.Accuracy analysis was performed in consideration of waveform distortion.The results show that on ideal undistorted ground penetrating radar (GPR) data,the proposed method is accurate in estimating the depth and the horizontal position of buried targets,as well as the electromagnetic wave speed.An average error of 55.202％ occurs in depth estimation based on distorted waveform data even though the estimation result of wave speed is accurate as before.So the method is corrected to confirm the depth of buried targets using the estimated wave speed and the two-way travel time of the reflected wave from the structures when facing distorted GPR data,and the accuracy of estimation satisfies the requirements of the GPR method.This method is more satisfactory and robust compared with the empirical method.