The Estimation of Buried Pipe Diameters by Generalized Hough Transform of Radar Data

摘要: The generalized Hough transform method is applied to the measurement of diameters buried cylindrical pipes by Ground Penetration Radar (GPR). 600 MHz radar scans across long pipes, in one metre or so soil, show complex reflection patterns consisting a series inverted hyperbolic arcs. time flight t(y) as probe scanned along an axis, y, perpendicular pipe, shows arc whose shape and position depends on 4 unknown variables: y0, center pipe scan, z0, depth center, R0, its radius V0 velocity medium. Analytic expressions for solution these variables have been obtained. They use sets times ti at corresponding positions yi, arc, depending number be determined. In many such are chosen randomly from points results presented example peaks accumulator space each variable. demonstrated 0.18 m concrete nominal 1 road. Using data acquired 600MHz frequency (around 0.16m wavelength soil) estimated was 0.174 ± 0.059 m.