This paper evaluates and compares the performance of two algorithms that have previously demonstrated their potential in underground target detection. Field data was obtained on specially prepared test fields, where various mine simulants, reference objects, and mine-like clutter where placed at precise locations in different soil types. The efficiency of both algorithms in terms of detection accuracies (ROC curves) and computational burden is compared, as well as the impact of preprocessing strategies. Based on the results, we discuss the convenience of both methods to be integrated in a real - time signal processing system considering their benefits and drawbacks.
At the moment of carry out a study with ground penetrating radar (GPR) it is interesting to count with the support provided by other information sources. All the available information relative to the study area will be valuable in the subsequent phases of processing and interpretation of the obtained GPR records. Nowadays there is a logical trend to the integration of GPS devices. The decrease in size of these equipment, the increase of their accuracy and new wireless communication technologies (802.11, Bluetooth,...) encourage this incorporation. GPR/GPS integration allows an accuracy positioning of the radar data under favourable conditions. Furthermore it brings the possibility to import this data into a geographic information system (GIS). This study deepens the process of integration of both technologies applied to road evaluation. To the accomplishment of this study, a dual frequency (L1+L2) RTK GPS, two Bluetooth GPS receivers (with SiRF chip) admitting both real time differential corrections (SBAS), and a GPS receiver with post-processed sub-meter accuracy were used. As regards GPR equipment, shielded 500, 800 and 1000 MHz antennas were used in different configurations.
Prestige fuel oil tanker was damaged during a storm in November 13rd, 2002, close to the coast of Galicia (Spain). After some days the Prestige broke in half and sank, leaking about 40.000 tons of oil which affected more than 1.000 km of the coast in Spain, Portugal and France. Some months later, layers of fuel contamination still appear at different depths in the sand of the beaches. The tidal process is that the first tide brings fuel over the sand but, if it is not removed, following tides place clean layer of sand on the top of fuel, and the beaches appear to be clean. Layers of fuel appears at different depths in the sand, from some cm to 1-2 meters. The lateral extent of the contamination also varies from some cm to more than 1 m. Radar sensors could be used in-situ to detect and imaging fuel layers below sand in some inland areas, which are under the influence of high winter tides but remain out of the influence of salt water from the sea during spring and summer time. This study show some tests carried out on the beaches with a ground-penetrating radar system operating with 500 & 800 MHz nominal frequency antennas, and a study case made in the beach of Carnota (Galicia) where it was possible to detect an imaging a buried fuel layer 6 months later.