Pier-Side, Bow Sonar Calibration Methodology for Wave Piercing Hull Forms

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N65538-07-M-0053
Agency Tracking Number: N062-139-0485
Amount: $69,996.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: N06-139
Solicitation Number: 2006.2
Small Business Information
475 Bridge Street, Suite 100, Groton, CT, 06340
DUNS: 112716357
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jason Rudzinsky
 Principal Scientist
 (860) 448-3253
Business Contact
 David Horne
Title: Vice President/Business M
Phone: (860) 448-3253
Email: dhorne@aphysci.com
Research Institution
The DD(X) destroyer relies on sophisticated, dual frequency bow sonar for mine-avoidance, ASW, and torpedo defense. Existing approaches to in situ bow sonar calibration that use booms to extend hydrophones beyond the sonar, along with legacy nearfield-to-farfield projection algorithms, will not work for DD(X) due to the ship’s strict radar cross section requirement and unique hull and sonar array shapes. Here we propose an innovative calibration system for the DD(X) bow sonar’s mid- and high-frequency components - both transmit and receive - which can be utilized pierside or in a harbor setting. The proposed system features three main components: a nearfield transducer array used to measure the sonar’s transmitted fields and to ensonify the sonar’s receivers; algorithms to accurately project the nearfield responses to the farfield; and an acoustic positioning system which eliminates the need to fix the nearfield array to the hull. The nearfield array is comprised of multi-mode transducers, which can operate in both omnidirectional and dipole modes. In Phase I, we’ll mature the proposed algorithms, develop a preliminary system design, and specify deployment and quality control concepts.

* Information listed above is at the time of submission. *

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