Research on Feature Recognition and Extraction of Buried Cable Hyperbola

The echo signals of buried cables under two kinds of three-dimensional soil structure models are studied and the accuracy of the proposed method for identifying and extracting hyperbolic features is validated. The method comprises the following steps of: preprocessing the direct coupled wave by signal preprocessing; segmenting the image by setting a threshold value; searching for the energy maximum value of each horizontal position for extracting the hyperbola characteristic point; finally performing the hyperbolic fitting by the least squares method; Formula to obtain electromagnetic wave propagation velocity in soil medium, the final calculation of the cable coordinates and simulation results set value close to. This paper analyzes the difference of echo signals under the same soil depth and the same cable depth, which provides a good theoretical basis for the practical application of cable detection. In addition, the hyperbolic feature recognition proposed in this paper has good accuracy when verified by simulation results.