埋地非金属管道雷达探测成像定位方法研究

非金属管道在地下管网建设中得到广泛应用。 探地雷达法作为地下公共设施主要检测方法之一,常被用于地下非金属 管线探测中。 由于探测过程中存在非金属管道回波信号微弱、地下结构复杂、波速难以精确估算等问题,使雷达探测成像及定 位成为难题。 针对上述问题,研究了适用于埋地非金属管道的波速估算和回波信号处理方法,提出了空间频域插值成像和二值 化定位算法;通过数值仿真验证了所述成像定位方法的可行性,并进行了 0. 400、0. 600 和 1. 100 m 埋深的非金属管道现场测 试。 实验结果表明,所提方法能够有效消除双曲线效应,探测区域的成像定位误差分别为 0. 006、0. 006 和 0. 012 m,满足埋地非 金属管道定位需求。 研究成果可为埋地非金属管道成像及定位提供技术支持,有益于提高探地雷达对地下非金属管线的探测 精度。

Research on imaging and positioning method of buried non-metallic pipeline radar

Non-metallic pipelines are widely used in the construction of underground pipe networks. As one of the main detection methods of underground public facilities, the ground penetrating radar method is often used in the detection of underground non-metallic pipelines. Due to the weak echo signal of non-metallic pipelines, complex underground structures, and difficulty in accurately estimating wave velocity in the detection process, radar detection imaging and positioning have become a problem. In response to the above questions, the wave velocity estimation and echo signal processing methods suitable for buried non-metallic pipelines are studied, the spatial frequency domain interpolation imaging and binarized positioning algorithms are proposed, the feasibility of the imaging positioning method is verified by numerical simulation, and the field tests of non-metallic pipelines buried at 0. 400, 0. 600 and 1. 100 m are carried out. The experimental results show that the proposed method can effectively eliminate the hyperbolic effect, and the imaging positioning errors in the detection area are 0. 006, 0. 006 and 0. 012 m, respectively, which meet the positioning requirements of buried non-metallic pipelines. The research results can provide technical support for the imaging and positioning of buried non-metallic pipelines and are conducive to improving the detection accuracy of ground penetrating radar on underground non-metallic pipelines.