The Acoustic Signal Processing Branch conducts a theoretical and experimental program addressing basic and applied ocean acoustics, system performance prediction and enhancement, and underwater acoustic communications (ACCOM). The long-term objective is to predict and optimize the performance characteristics of present and future Navy ASW, MCM and ACCOM systems through an understanding of the fundamental performance limits in the ocean environment. At-sea experiments are critical to fulfill the research mission. The ocean acoustics research establishes quantitative relationships between the variability in acoustic signal properties and the physical processes that cause space/time variability in the ocean sound speed field; develops the ability to predict acoustic field variability in the littoral by coupling non-hydrostatic fluid dynamic models and acoustic propagation models; studies the noise generation processes and its space-time properties; estimates the geo-acoustic properties of the ocean sub-bottom through inversion techniques based on acoustic data; and estimates the channel capacity for ACCOMs. The research into signal propagation and noise characteristics leads to prediction of the performance of evolving Navy systems and development of new system concepts and development of new detection, localization, classification and communication algorithms that incorporate the physics of signal propagation and mitigate the uncertain channel variability and uncertainty.
The acting Branch Head can be reached at (202) 767-2579.
The Acoustics Signal Processing Branch is not comprised of sections, but rather Projects within Topic Areas. Each Project is headed by a Principal Investigator.
|Topic Area||Project Name|
|Undersea Noise - Impact on Large Aperture Array Performance - Shallow and Deep Water Operating Areas||Large Aperture Noise Gain|
|Surf Zone and Open Ocean Breaking Wave Noise Generation|
|Radiated Shipping Noise - Commercial and Recreational|
|Random Media Propagation Physics - Impact on Array Performance - Littoral Operating Area||Acoustic Propagation in a Random Shallow Water Waveguide - Flow Visualization of the Littoral Fluid Processes That Perturb the Sound Speed Field|
|Coupled Non-hydrostatic Fluid Dynamic and Acoustic Propagation Simulations - Predict Array Performance in Dynamic Littoral Ocean (10-1000 Hz)|
|Relationship of Acoustic Array Signal Gain to Shelf Break Fluid Processes - Array Performance in the Littoral (10-1000 Hz)|
|Fish Swim Bladder Absorption and Scatter - Impact on Transmission Loss (100 - 10,000 Hz)|
|Ocean Bottom Property Estimation||Biot Theory Based Bottom Property Inversion Using Nadir Incident Broadband (900 -15000 Hz) Acoustic Signals|
|Bottom Property Inversion Using Towed Arrays and Self Noise|
|Underwater Acoustic Communications||Phase Coherent Underwater Acoustics Communications - Impact of the Environment on Bit Error Rates|