Detection of amplitude modulation of sea vessel underwater noise emission at rolling and pitching at the background of ultralow frequency fluctuations
https://doi.org/10.7868/S2073667319020023
Abstract
Analysis of the influence of ultralow frequency (up to 0.05 Hz) fluctuations of sea vessel underwater noise emission on the possibility of extraction of signal amplitude modulation existing in the frequency band of sea vessel rolling and pitching on the rough surface (from 0.03 to 0.5 Hz) is carried out. Possible characteristic variants of ultralow frequency fluctuations spectra are determined based on the analysis of signals recorded in natural conditions. Appearance of ultralow frequency signal fluctuations was observed in different frequency bands of the total frequency band of the carrier signal (from 0.5 to 8.0 kHz). Different hypotheses of the nature of ultralow frequency fluctuations formation depending on hydrologicalacoustic conditions are proposed. It is shown that ultralow frequency fluctuations can have negative effect on the possibility of amplitude modulation detection. Possible circuits of extraction of signal amplitude modulation in rolling and pitching frequency band against ultralow frequency fluctuations are considered. The effective method of compensation of ultralow frequency fluctuations influence for a standard device of detection of amplitude modulation caused by rolling and pitching is presented. The proposed method is implemented as software in the structure of a standard device. Operability of the method has been shown using noise signals of sea vessels recorded in natural conditions.
About the Authors
A. D. Konson
JSC «Concern «Oceanpribor»
Russian Federation
Russian Federation
St.-Petersburg
A. A. Volkova
JSC «Concern «Oceanpribor»
Russian Federation
Russian Federation
St.-Petersburg
References
1. Kudryavtsev A.A., Luginets K.P., Mashoshin A.I. Amplitude Modulation of Underwater Noise Produced by Seagoing Vessels. Akusticheskij Zhurnal. 2003, 49, 2, 224–228 (in Russian).
2. Mashoshin A.I. Optimization of a device for detecting and measuring parameters of amplitude modulation of underwater noise emission of seagoing vessels. Akusticheskij Zhurnal. 2013, 59, 3, 347–353 (in Russian).
3. Volkova A.A., Konson A.D. Field observations of superslow fluctuations of noise signal of surface ship. Hydroacoustics. 2017, 30(2), 52–59 (in Russian).
4. Ocean acoustics / L.M. Brekhovskikh. М., Science, 1974. 693 p (in Russian).
5. Lysanov Yu.P. Sound scattering by uneven surfaces. In Ocean acoustics / L. M. Brekhovskikh. М., Science, 1974, 231–330 (in Russian).
6. Andreeva I.B., Chuprov S.D. Reflection and sound scattering by the uneasy surface of the ocean. In Ocean acoustics / L.M. Brekhovskikh. М., Science, 1974, 331–394 (in Russian).
7. Konson A.D. Correlation of Power Fluctuations in the Noise Signal Emitted by a Surface Ship. Akusticheskij Zhurnal. 1999, 45, 4, 523–527 (in Russian).
8. Konson A.D. Range of fluctuation of signal power, radiated by the ship at the rolling. Sudostroyeniye. 1997, 6, 46–48 (in Russian).
9. Konyayev K.V., Sabinin K.D. Waves in the ocean. SPb., Gidrometeoizdat, 1992. 272 p (in Russian).
10. Gulyayev Yu.V., Proklov V.V., Shkerdin G.N. Diffraction of light on the sound in rigid bodies. Uspekhi fizicheskikh nauk. 1978, 124, 1, 61–111 (in Russian).
11. Borovikov V.A., Kinber B.Ye. Geometrical theory of diffraction. M., Svyaz’, 1978, 247 p. (in Russian).
12. Konson A.D., Volkova.A.A. Patent RU № 2645013 on 15.02.2018. Bull. № 5. Method of determining displacement of surface ship with its noise direction finding. Int.Cl. G01S3/80 (in Russian).
Review
For citations:
Konson A.D., Volkova A.A. Detection of amplitude modulation of sea vessel underwater noise emission at rolling and pitching at the background of ultralow frequency fluctuations. Fundamental and Applied Hydrophysics. 2019;12(2):12-19. (In Russ.) https://doi.org/10.7868/S2073667319020023
Views:
157
Email this article 