Shallow Ground-penetrating Radar Small Target Echo Signal Processing Method

Ground penetrating radar (GPR) is an effective tool to detect buried targets, which detects buried targets via the discontinuity of dielectric. Ground penetrating radar has a lot of virtues, such as rapid and continuous surveying, simple and convenient operation, high resolution, nondestructive detection etc, so which has been used to fields of national defense, police, construction of highway, railway, bridge, tunnel, and prospecting, geologic studies, archaeological studies etc.GPR is used to detect shallow layer until the UWB technology is developed and used to GPR, so the history of shallow layer detection if shorter compared with the history of middle depth layer detection and deep layer detection, and so the GPR signal processing of shallow layer detection is under developing. In the shallow layer detection, the detection of small target buried shallowly requires more complex signal processing method.This paper's studied buried small targets signal processing technology of impulsive ground penetrating radar, include automotive detection and Orientation, improving space resolution and synthetic aperture imaging. The main work and the innovation are showed as follow:1. Discussed many signal processing methods in common use and proposed a new signal processing automatic detection methods based on hyperbola feature of echo single. This method processes GPR B-Scan layer by layer, restrains noise and clutter, and distills targets hyperbola of buried small targets.2. Analyzed causes of the hyperbolic trailing of down-range on the Ground-Penetrating Radar and its impact for GPR resolution. Investigated the features of hyperbolic trailing, and proposed a novel method based on correlation to recognize trailing. Improve down-range space resolution notably.3. After automatic detection and trailing reorganization, analyzed and compared ? k and BP synthetic aperture imaging based on Minimum entropy velocity estimation algorithm to orientate targets accurately.4. Used situational and experimental data to verify the effectiveness of the proposed algorithm.Moreover, this paper discussed the propagation of electromagnetic wave in soil, the basic principle of ground penetrating radar, proposed suggestions for future research.