Existing mid-frequency (MP) hull-mounted active sonars can be used for high resolution imaging of submarines and small objects in shallow water (SW) by combining synthetic aperture sonar (SAS) technology with matched field processing (MFP). SAS increases the overall sonar system aperture (from the… More

Existing mid-frequency (MP) hull-mounted active sonars can be used for high resolution imaging of submarines and small objects in shallow water (SW) by combining synthetic aperture sonar (SAS) technology with matched field processing (MFP). SAS increases the overall sonar system aperture (from the… More

Present submarine passive sonars utilize collinearly located sensors to obtain target range by the method of Wavefront Curvature Ranging (WCR). The requirement for sensor collinearity creates difficult and costly installation problems. Thus, the goal ofthe proposed effort is to demonstrate the… More

The Navy's current airborne ASW active sonar systems rely on pulse type sonars to develop accurate localization to attack solutions. To improve this capability, pulse sonars require: 1) higher source level sonobuoys resulting in larger and heavier sources, 2) higher energy sources that may require… More

Effective antisubmarine warfare (ASW) requires knowledge of all aspects of the complicated undersea environment. Variability of the oceanographic temperature field affects the sound speed structure and, therefore, acoustic propagation. With the development of dynamic ocean models and long-life… More

Recent advances have been made in searching for and locating volume and proud mines in shallow and very shallow water. The procedure for neutralizing mines is still labor intensive, slow, expensive and dangerous. In this SBIR, OASIS and Lockheed Martin-Sippican (LMS) address the need for a ship,… More

Effective antisubmarine warfare (ASW) requires knowledge of all aspects of the complicated undersea environment. Variability of the oceanographic temperature field affects the sound speed structure and, therefore, acoustic propagation. With the development of dynamic ocean models and long-life… More

Remote classification of seafloor geotechnical properties is addressed in this SBIR. In shallow coastal waters, the current standard Navy databases do not contain information of suitable quality to determine pre-mission whether seafloor mines will be proud or buried, whether deployed bottom arrays… More

Current geo-technical measurement systems are low resolution and generally require significant research vessel support. In this SBIR, the OASIS/WHOI team proposes to build a system that will remotely, autonomously and rapidly estimate and map shear strength parameters using state-of-the art… More

The OASIS and MPL-SIO team will develop an exact 3D time-domain finite difference (TDFD) code for the near-target scattering from a complex elastic object embedded in the littoral environment. The approach for this time-domain code is based on a staggered grid, pseudo-spectral finite difference… More

The proposed work will focus on combined signal processing and acoustic modeling that will ultimately enable high-accuracy navigation under the Arctic ice at ranges up to and including basin scale. This combined approach is required because as the source-vehicle range increases, the bandwidth of the… More