Determination the Position and Distance of a Ground Source of Random Vibration

This work is concerned with the recognition of a distance source of random vibration in an elastic media. The received signal is recorded at a number of receiver locations and processed to determine source parameters such as bearing location, track…etc. The source and receivers are all situated in one plane. To determine source bearing, cross-correlation in the domain is used together with quadrature minimization techniques in order to estimate the time delay between adjacent receivers. To determinate location and track, Newton-Raphson method is used to solve the trigonometric relations for the geometry concerned. Results show that over a wide range of the power spectrum, source bearing and location can be estimated to a good degree of accuracy. Different receiver arrangements were tried while aiming at finding the suitable combination. Study included three receivers in line (straight triad) or not on one line (convex and concave triads). Prediction errors are the order 0.1% range up to + 60o from the forward and 1% for source location in the range 0-10000 meters. Results are further improved using large numbers forming arrays of detectors.