Sigma Xi Research Exhibition

Registration & Submission Deadline

Wednesday, April 10, 2013 @ 11:59 PM

Exhibition Dates

April 23rd & 24th, 2013

Claire T. Carney Library Addition

Abstract Details

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Multimode Underwater Beacon

Primary Author(s)

Brandon M. Macedo, David A. Brown; Mechanical and Electrical Engineering Department


In the underwater navigation of vehicles such as AUVs it can be very difficult to obtain accurate bearing estimates during travel. Many systems require the vehicle to surface frequently to obtain accurate location data via satellite. This project investigates the use of a multi-mode transducer which operates in both “omni” and “1” mode to be used as an underwater beacon. By modulating the signals of elements which offer quadrat-pole directivity in conjunction with an onmi mode signal, the phase of a received signal (in comparison to some reference) can be used to determine a bearing angle.

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Contact Info:

Organizer: Grant O'Rielly (Physics), 508.999.8483,

Organizer: Elizabeth Winiarz (Library), 508.999.8696,