(Top) CSAS imagery generated using SSAM. Insets show a ladder, car tire, bar- rels and a boat overlaid on topography. The background image shows a beveled training cylinder.
(Right) Bathymetry for snippets of scenes containing a cable, a bridge-supporting column and an anchor. The SAS intensity image has been overlaid on the anchor bathymetry. (Photos courtesy of the U.S. Navy)
Division (NSWC PCD) and the Ap- plied Research Laboratory, Penn State University, is a multiscale design that exploits all of these advantages. It consists of two SAS systems: a high- frequency SAS and a broadband SAS, wherein two separate projectors share a common hydrophone array. The broadband SAS provides detec- tion, classification and localization of scoured and partially buried objects. The SSAM is deployed on a 12.75-inch-diameter Hydroid Inc. (Pocasset, Massa- chusetts) REMUS 600 AUV, operated by the Woods Hole Oceanographic Institution. Presently, two generations of the SSAM concept exist, both of which operate in strip-map mode: monostatic and
utilizing broadside beams. The first-generation SSAM system was fielded from 2005 through 2009, participating in 11 events and surveying more than 23 square nautical miles of seabed. The second-generation system, SSAMII, has been fielded since 2010 and is designed for hunting proud and heavily scoured objects in shallow-water and nearshore en- vironments.
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