Abstract: The goal of the waterjet-based mine location andidentification project is to find a way to usewaterjets to locate and differentiate buried objects.When a buried object is struck with a high-pressurewaterjets, the impact will cause characteristicvibrations in the object depending on the object'sshape and composition. These vibrations will betransferred to the ground and then to the water streamthat is hitting the object. Some of these vibrationswill also be transferred to the air via the narrowchannel the waterjet cuts in the ground. Currently theground vibrations are detected with Doppler radar andvideo camera sensing, while the air vibrations aredetected with a directional microphone. Data iscollected via a Labview based data acquisition system.This data is then manipulated in Labview to produce theassociated power spectrums. These power spectra are fedthrough various signal processing and recognitionroutines to determine the probability of there being anobject present under the current test location and whatthat object is likely to be. Our current test areaconsists of a large X-Y positioning system placed overapproximately a five-foot circular test area. Thepositioning system moves both the waterjet and thesensor package to the test location specified by theLabview control software. Currently we are able tolocate buried land mine models at a distance ofapproximately three inches with a high degree ofaccuracy. !2
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