We present an approach for the generation and use of coded signals with very wideband chip signals for underwater applications. We performed measurements using a parametric array in a large water tank. We fabricated a transducer consisting of a 3 mm thick and 75 mm-by-75 mm square-shaped PZT ceramic plate, which is matched to water media at the radiating face and terminated by a very low impedance at the back. We used the square-root amplitude modulation and complementary Golay sequences to code the driving signals centered around 855 kHz primary frequency. We employed a correlation receiver at reception. Our measurement results showed that generating coded signals with varying code and chip signal lengths at 10-80 kHz difference frequency range is possible. We measured that the normalized correlation receiver output at 40 kHz for a 2-chip coded signal with the widest bandwidth chip signal length of 2-cycles/chip is 0.94, which indicates a strong correlation and is consistent with those measured at other difference frequencies. As a result, we obtained well-defined coded signals with a chip length of 2-cycles/chip at a 10-80 kHz frequency range, although we also observed coded signals with shorter chip signals.
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18 November 2024
187th Meeting of the Acoustical Society of America
18–22 November 202
Virtual Meeting 2024
Signal Processing in Acoustics: Paper 1aSP5
December 26 2024
Generation of very wideband chip signals for coded underwater applications using parametric array
Yasin Kumru;
Yasin Kumru
1
Department of Electrical and Electronics Engineering, Bilkent University Faculty of Engineering: Bilkent Universitesi Muhendislik Fakultesi
, Ankara, Bilkent, 06800, TURKEY
; [email protected]
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Hayrettin Köymen
Hayrettin Köymen
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Proc. Mtgs. Acoust. 55, 055001 (2024)
Article history
Received:
November 14 2024
Accepted:
December 15 2024
Citation
Yasin Kumru, Akif Taşdelen, Hayrettin Köymen; Generation of very wideband chip signals for coded underwater applications using parametric array. Proc. Mtgs. Acoust. 18 November 2024; 55 (1): 055001. https://doi.org/10.1121/2.0001985
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