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Bistatic scattering from submerged unexploded ordnance lying on a sediment

2009; Acoustical Society of America; Volume: 126; Issue: 5 Linguagem: Inglês

10.1121/1.3212920

1520-9024

J. A. Bucaro, Harry Simpson, Larry A. Kraus, Louis R. Dragonette, Timothy J. Yoder, Brian H. Houston,

Ocean Waves and Remote Sensing

The broadband bistatic target strengths (TSs) of two submerged unexploded ordnance (UXO) targets have been measured in the NRL sediment pool facility. The targets—a 5 in. rocket and a 155 mm projectile—were among the targets whose monostatic TSs were measured and reported previously by the authors. Bistatic TS measurements were made for 0° (target front) and 90° (target side) incident source directions, and include both backscattered and forward scattered echo angles over a complete 360° with the targets placed proud of the sediment surface. For the two source angles used, each target exhibits two strong highlights: a backscattered specular-like echo and a forward scattered response. The TS levels of the former are shown to agree reasonably well with predictions, based on scattering from rigid disks and cylinders, while the levels of the latter with predictions from radar cross section models, based on simple geometric optics appropriately modified. The bistatic TS levels observed for the proud case provide comparable or higher levels of broadband TS relative to free-field monostatic measurements. It is concluded that access to bistatic echo information in operations aimed at detecting submerged UXO targets could provide an important capability.