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Warianty tytułu
Języki publikacji
Abstrakty
The paper investigates the application of digital modulation access technique called Code Division Multiple Access (CDMA) to remote sensing of a seafloor. In a traditional sonar, the next ping cannot be sent until the echo from previous transmission has been received by the sonar transducer. As a result, such a sonar system is characterized by low duty ratio what causes the decrease of data resolution especially for larger depths. Using the CDMA modulation technique, may reduce pulse repetition rate. In the CDMA technique, each sonar pulse consists of several multiple narrow pulses, where each is encoded with a phase shift 0 or đ based on a spreading code. The paper presents the performance investigation results for this modulation scheme as applied both to transmitted and seafloor backscattered signal. The bottom backscattering was modeled numerically for typical bottom material and morphology. The advantages and constraints of the proposed technique were discussed in the context of echo detection and usefulness in acoustic seafloor characterization.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
15--22
Opis fizyczny
Bibliogr. 8 poz., rys.
Twórcy
autor
- Gdansk University of Technology Narutowicza 11/12 Gdańsk
autor
- Gdansk University of Technology Narutowicza 11/12 Gdańsk
Bibliografia
- [1] J. L. Richards, A Spread Spectrum Sonar with Noise-Locked Loop-Based Entrainment, Masterpiece of MIT, 2000.
- [2] B. W. Parkinson, Global Positioning System: Theory and Applications, Amazon, ISBN: 156347106X, 1996.
- [3] E. D. Kapalan, Understanding GPS: Principles and Application, Artech House Inc. 1996.
- [4] A. J. Viterbi, CDMA : Principles of Spread Spectrum Communication, Addison-Wesley, ISBN: 0201633744, 1995.
- [5] H. Medwin, C., S.. Clay, Fundamentals of Acoustical Oceanography, Academic Press Ltd. 1998.
- [6] X. Lurton, An Introduction to Underwater Acoustics, Principles and Application, SpringerVerlag, Praxis Publishing Ltd. 2002.
- [7] R. Salamon, Zarys teorii szerokopasmowych przetworników hydroakustycznyych, Zeszyty naukowe Akademii Marynarki Wojskowej Nr 106 A. Gdynia 1990r
- [8] Z. Lubniewski, M. Moszynski, A. Stepnowski, Modelling of surface and volume backscattering of echosounder signals on sea bed using fractal analysis and impulse response, Proceedings of the 5th European Conference on Underwater Acoustics, Lyon, 2000, 307-312.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWM8-0034-0003