Multi-Aperture Passive Sonar Array Calibration using Ocean Ambient Noise
Abstract
The goal of this project is to improve passive sonar detection and localization performance by enabling the coherent combination of multiple acoustic array apertures. The increasing number of acoustic apertures on undersea platforms provides practical motivation for coherent multi-aperture array processing. Although the theoretical advantages of such processing are well-known, the inability to sufficiently calibrate separated arrays has precluded their coherent combination in practice. Currently, the use of multiple apertures is limited to non-coherent, post-detection, combining of processor outputs to e.g. estimate target range rather than to enhance weak target detection. In fact, even the calibration of individual towed arrays is a still serious issue since it impacts the ability of beamformers to suppress distributed interference and high bearing-rate near-field interferers. This project will conduct basic research into the mathematical structure of this problem, and will develop new signal processing methods to contend with the challenges, with the ultimate goal of improving the performance of submarine passive sonar sensors and Fixed Surveillance System sensors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 26, 2018
- Source ID
- N000141812664
Entities
People
- Jeffrey Krolik
Organizations
- Duke University
- Office of Naval Research
- United States Navy