Abstract
Abstract : Under this project, GEO-CENTERS, Inc and the US Army Corps of Engineers developed and demonstrated a proof-of-concept synchronized data acquisition and processing system (referred to as Simultaneous Multisensor STOLS ) that allows simultaneous deployment of industry standard Geonics EM61 pulsed induction sensors and Geometrics 822A total field magnetometers on a single vehicular-towed platform. New sampling electronics were designed and developed that interleave the magnetometer and the EM61 data, sampling the magnetometers only after the EM61 pulse has diminished, thereby eliminating the EM61- induced noise on the magnetometers that plagues these sensors when conventionally codeployed. This allows, for the first time, magnetometers and EM61 coils to be co-located on a single towed platform. Both magnetometer and EM61 data are geodetically located using positioning information from a single GPS navigation system, creating spatially co-registered data sets. GEO-CENTERS' existing vehicular towed array (the Surface Towed Ordnance Location System, or STOLS) was employed as a development system; the vehicle, sensors, centimeter-level GPS navigation system, sensors, and data processing capabilities were all reused. A new non-metallic proof-of-concept towed sensor platform was developed to host the magnetometers and EM61 sensors in a very low-noise environment. Constructed almost entirely from fiberglass, the platform has had the metallic mass reduced by over 99% as compared to the previous aluminum platform. Existing data processing software was modified to allow simultaneous viewing and analysis of magnetometer and EM61 data so that panning, zooming, or drawing an area of interest in one view of data does the same in the other view. Corrected data are written out in a Geosoft Montaj-compatible format.
Published Version
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