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ECE Master of Science Thesis Defense By: Matthew D. Tidwell

When: Tuesday, August 27, 2019
10:00 AM - 12:00 PM
Where: Science & Engineering Building, Lester W. Cory Conference Room: Room 213A
Cost: Free
Description: Topic: Designing Linear FM Active Sonar Waveforms for Continuous Line Source Transducers to Maximize The Fisher Information at a Desired Bearing

Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A

ABSTRACT:
Several authors previously found that echolocating animals aim their sonar beam to place the target of interest slightly off the main beam axis. Analysis found the animals' beam aiming strategy maximized the Fisher Information (FI) about the target bearing encoded in the frequency spectrum of the received echoes by the transmitter's frequency dependent beampatterns. This thesis reverses the focus from analysis to synthesis. We present design methods to maximize the FI of the bearing estimate at a desired angle using linear frequency modulated (LFM) waveforms transmitted by a continuous line source (CLS) transducer. If the bandwidth of the transmitted chirp is sufficiently small relative to the center frequency, the angle maximizing the bearing FI is solely determined by the center frequency. The center frequency is shown to place a null in the transducer's beampattern at the target's angular location or, equivalently, the target's angular location places a null in the received echo at the corresponding center frequency. This maximizes the waveform's relative variation resulting in favorable auto-correlation properties. Increasing bandwidth increases robustness to target bearing mismatch at the cost of decreased precision at the target's true angular location.

NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.

Advsior: Dr. John R. Buck
Committee Members: Dr. Dayalan P. Kasilingam, Department of Electrical & Computer Engineering, UMASS Dartmouth and Dr. Mary H. Johnson, Naval Undersea Warfare Center

*For further information, please contact Dr. John R. Buck at 508.999.9237, or via email at jbuck@umassd.edu.
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