A new ground penetrating radar signal analysis method based on S transform

The paper discussed the characteristics of GPR signals of one object and two objects respectively, and studied the rule of extracting twin-peak attribute when the size of object or the distance of two objects was changing through GST. For one object, the two reflections can´t be resolved in time when the diameter of object is less than or equal to 1/3 dominant wavelength within object medium, but the twin-peak attribute can resolve the reflections when the diameter is as small as 1/7 dominant wavelength, so the size can be estimated combining the attribute with time-domain waveform and the definition of a small object can be given. For two objects that each is a small object in time-frequency domain, we considered the situations where the permittivity were same or different, and it is pointed out that the attribute can improve the resolution of two objects and can estimate the distance combined with time-domain waveform. The selection rule of parameter and frequency point of twin-peak attribute was given as well so the unsystematic problem was solved.