Sea Technology

NOV 2018

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www.sea-technology.com November 2018 | ST 13 gies, including synthetic aperture versions of the AN/AQS-24 towed side scan sonars. In the 1990s, Raytheon Co., under Defense Ad- vanced Research Projects Agency (DARPA) sponsorship, built a long- range experimental system, for which Dynamics Technology Inc. (DTI) developed the end-to-end SAS processing (motion compen- sation through autofocus). These developments led to commercial offerings in real-time SAS process- ing for wide-swath, high-resolution sonars, as well as the first commer- cially sold SAS system (with Edge- Tech Inc.). DTI merged with Applied Sig- nal Technology Inc., expanding its SAS product line, and eventually merged with Raytheon to upgrade the AN/AQS-20 towed mine-hunt- ing sonar for SAS operation. Other U.S. experimental systems that in- formed the R&D community during the 1990s include multiple-receiv- er and sub-bottom swath mapping configurations by the University of California, Santa Barbara/Sonatech and the University of Hawaii/Alli- ant, respectively. NATO Collaborative Developments Beginning with several decades of transatlantic technical exchang- es, a rich variety of SAS technolo- gies evolved that include the French DUBM series, the Norwegian HISAS system, the NATO MUSCLE system, as well as the German Vision and Canadian MINSAS systems. The U.S. and France had a series of technical exchanges that began with the licensing of the C-MK-1 SHADOWGRAPH to France in the 1960s, continuing with SAS re- search exchanges between NSWC PCD and the Groupe d'Etudes Sous Marines de l'Atlantique (GESMA) in the 1990s. These and French ini- tiatives in the military, commercial and academic sectors (e.g., ACID/ SAMI, IMBAT, ASEMAR, MUSCLE technologies) would contribute to the eventual SAS upgrade of the Thales DUBM series, as well as synthetic aperture developments in buried object imaging. Expanded technical exchanges between NATO partners led to initi- ation of the Mine Countermeasures Joint Research Program (MCM JRP), with participation by the U.S., U.K., Germany, France, Netherlands, Norway, Belgium, Canada, Spain and others from the late 1990s to the present. A milestone event for the alliance was the InSAS'00 INS- equipped interferometric SAS rail experiments conducted off Elba Is- land, Italy, with participation by the NATO STO Centre for Maritime Re- search and Experimentation (CMRE, then known as SACLANTCEN), the U.K. Defence Evaluation and Re- search Agency (DERA), and the UNDERWATER DRONES +33 (0)297 898 580 http://rtsys.eu/en sales @ rtsys.fr FIND YOUR APPLICATION HANDHELD SONAR FOR DIVERS UNDERWATER ACOUSTIC RECORDERS Marine Mammals Offshore Renewable Energies Defence Oil & Gas Lineage for current seabed mapping SAS systems and product lines, the majority of which rely on the core discoveries and inventions described in this article.

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