Lightweight Array Technologies

Under this research program, new towed array technologies suitable for operation from AUVs and USVs are developed. Such arrays would aid multiple AUVs and USVs in many underwater surveillance and imaging applications. Two technologies are currently being explored:

  • Arrays employing ceramic hydrophone based sensing technology
  • Arrays based on fiber laser sensor based hydrophones

Apart from shear engineering challenges in realizing such a small array configuration, there are many technical and scientific questions that remains to be answered in order to understand the performance envelope and usability of the system for underwater applications. Our research efforts are towards characterizing the array performance against many interfering noises such as electronic noise, flow noise and vibration.

Digital Thin Line Array (DTLA)

ARL has developed a small diameter towed array measuring just 10.5 mm in external diameter and about 30 m long with a tow lead of 20 m. The array consists of 11 acoustic sensors, one electronic compass and a pressure sensor. The array has been towed behind an AUV and some of the findings from this exercise have been published [??].

Related Publications

[1] P. Venugopalan and P.Chotiros, “A robust and self-calibrating sediment classification system using an AUV-based short array and opportunistic source,” in 1st International Conference and Exhibition on Underwater Acoustics, (Corfu Island, Greece), June 2013. (Invited).
[2] K. C. Unnikrishnan, P. Venugopalan, M. A. Chitre, and K. Subash, “Estimated flow noise levels due to a thin line digital towed array,” in OCEANS 2011 MTS/IEEE, (Santander, Spain), May 2011. [ DOI | .pdf ]
[3] V. Pallayil, S. Sebastian, M. Chitre, K. Govind, and N. Chandhavarkar, “Characterisation of a digital thin line towed array-experimental assessment of vibration levels and tow shape,” in Underwater Acoustic Measurements: Technologies and Results, 3rd International Conference and Exhibition, (Nafplion, Greece), pp. 1235--1243, June 2009. [ .pdf ]
[4] V. Pallayil, M. Chitre, and P. Deshpande, “A Digital Thin Line Towed Array for Small Autonomous Underwater Platforms,” in OCEANS 2007 MTS/IEEE, (Vancouver, Canada), pp. 1--9, October 2007. [ DOI | .pdf ]
[5] J. R. Potter, E. Delory, S. Constantin, and B. S., “The thinarray; a lightweight, ultra-thin (8 mm OD) towed array for use from small vessels of opportunity,” in Underwater Technology 2000, Tokyo, Japan, June 2001. [ .pdf ]