基于反正切法的定向钻孔雷达三维成像算法

摘要

As a special mode of GPR,the directional borehole radar system can not only detect underground target depth and the radial distance but also identify the azimuth of target,and then it uses the azimuth for 3D imaging. The directional drilling radar in this paper consists of a transmitting antenna and four receiving antennas,and the four receiving antennas are distributed on the ring perpendicular to the borehole axis. Based on the insignificant difference between the four different receiving antenna signals,the authors propose the arctangent method for calculating azimuth angle. The combination of the azimuth angle and the signal produces the horizontal and verti-cal slice data,thus eventually realizing the borehole radar 3-D imaging algorithm. Finally,the effectiveness of the algorithm is verified by numerical simulation results.%作为探地雷达的一种特殊方式,定向钻孔雷达系统除了能够探测地下目标的深度和径向距离外,还能够对钻孔四周目标进行方位识别,进而利用所求方位进行三维成像.本文所研究的定向钻孔雷达包含一个发射天线和4个接收天线,4个接收天线等角度分布在垂直于井轴的圆环上.基于4个接收天线所接收到的四个信号的微弱不同,提出利用反正切法计算目标方位角,再利用方位角和各道信号组合计算井周地层纵横切片的算法,最终实现钻孔雷达三维成像算法.利用数值模拟结果检验了算法的正确性.