基于BS-MUSIC的定向钻孔雷达三维成像算法

定向钻孔雷达由位于井中的一个发射天线和分布于圆环上的呈等角度分布的四个接收天线组成,能确定井旁地质目标的深度和方位.然而,目标方位确定和三维成像的算法问题一直是该技术面临的挑战.本文将空间谱估计中的BS-MUSIC算法应用于定向钻孔雷达目标方位识别算法中,在此基础上提出并实现了利用四个接收天线的信号对井周地质体进行三维空间成像的算法.使用合成数据对以上算法的效果进行验证,并和通常的MUSIC算法进行比较,结果表明,MUSIC算法和基于波束空间的MUSIC算法均可以在方位确定和三维成像方面取得非常好的效果,但计算速度方面,BS-MUSIC算法相比于MUSIC算法有了非常明显的提升.

3D borehole radar imaging method based on BS-MUSIC

The directional borehole radar is composed of a transmitting antenna and four receiving antennas located on a circular ring in a borehole, which can determine the depth and orientation of geological targets. However,the corresponding azimuth determination and three-dimensional imaging algorithm remain challenges in this technique. In this paper, the spatial spectrum estimation based on the beam space MUSIC algorithm (BS-MUSIC algorithm) is applied to determining target azimuths for the directional borehole radar. An algorithm is proposed and implemented to convert the signals from four receiving antennas into three-dimensional spatial images. The effects of this algorithm are verified by using synthetic data and compared with the MUSIC algorithm results. The results show that the MUSIC algorithm and the BS-MUSIC algorithm can achieve very good results, while the calculation speed of BS-MUSIC algorithm has been significantly improved compared to the MUSIC algorithm.