The Use of Hilbert Transforms for Interpretation of GPR Data of Railway Tracks and Roads Survey

P145 THE USE OF HILBERT TRANSFORMS FOR INTERPRETATION OF GPR DATA OF RAILWAY TRACKS AND ROADS SURVEY Introduction 1 The GPR method is widely used for continuous measuring the thickness of road structural layers. For having a more complete characteristic of road serviceability it is necessary to solve the following problems: - to evaluate homogeneity of road substructure and subgrade; - to define changes of the filtration coefficient and soil dampness; - to detect in proper time defective areas and cavities in the subgrade. Evaluation of integral changes of these characteristics is possible by means Hilbert transforms of GPR data.