Marine environment monitoring method utilizing normal-mode coupling interference
A marine environment monitoring and marine environment technology, applied in the direction of using re-radiation, re-radiation of sound waves, radio wave measurement system, etc., can solve problems such as complex results and difficult analysis, and achieve simple and clear physical meaning, clear physical meaning, and simplified The effect of analysis and extraction of marine environmental change information
Active Publication Date: 2018-06-01
HARBIN ENG UNIV
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These methods can extract relevant information about changes in the marine environment to a certain extent, but they often rely on the information of the entire sound field, and the results obtained are complex and difficult to conduct intuitive analysis.
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[0054] The invention provides a marine environment monitoring technology utilizing normal wave coupling interference. The interference characteristics of the normal wave coupling mentioned above are affected by the time-varying and space-varying characteristics of the actual ocean environment, and the acoustic signals propagating therein will produce the normal wave coupling interference characteristics.
[0055] Acoustic pressure in a sound field in a realistic time- and space-varying ocean environment
[0056]
[0057] Among them, f is the sound wave frequency, r 0 is the distance from the location of the ocean environment change to the sound source, z r is the depth of the receiving hydrophone, M is the order of the normal wave, R is the distance from the receiving hydrophone to the sound source, a n (f; r 0 ,z r ,R) is the amplitude of the nth order normal wave, φ n (z r ) is the eigenfunction of the nth order normal wave at the receiving point.
[0058] Perform ...
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The invention provides a marine environment monitoring method utilizing normal-mode coupling interference. The marine environment monitoring method comprises the steps of: transmitting a broadband sound signal, and acquiring a sound pressure field at a receiving point when a marine environment changes; performing modal decomposition on the sound pressure field by utilizing a modal filtering methodto obtain sound pressure components of normal modes of various orders; subjecting the sound pressure components of the normal modes of various orders to conjugate multiplication with themselves, so as to obtain an interference pattern of the normal modes of various orders which are conjugated by themselves; and utilizing a waveguide invariant method to obtain an interference fringe slope in the interference pattern according to the interference pattern, and monitoring marine environment changes according to a relationship between the slope and relevant parameters of marine environment changes. The marine environment monitoring method can calculate the sound filed in the marine environment having temporal and spatial variation features in reality stably and rapidly, can obtain the interference pattern which is clear and simple and has a definite physical meaning from a complicated sound field interference pattern, can extract feature information of marine environment changes more easily, and is conductive to the early warning and monitoring of the marine environment changes.
Description
technical field [0001] The invention relates to an ocean coupling normal wave interference characteristic and an ocean environment change monitoring method. Background technique [0002] Sound waves travel through the ocean, creating a sound field. The actual ocean environment is time-varying and space-varying, which will distort the amplitude and phase of the acoustic signal propagating in it, so that the received acoustic signal has time-frequency interference and space-frequency interference characteristics, and these interference characteristics can be To a certain extent, it reflects the changes in the marine environment and related parameters. However, the existing methods are difficult to obtain information about changes in the ocean environment from the sound field, therefore, it is impossible to predict and measure the relevant factors that cause these changes in the ocean environment. [0003] In order to extract marine environment information from the sound fiel...
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IPC IPC(8): G01S15/89
CPCG01S15/89
Inventor 朴胜春张士钊李楠松张明辉
Owner HARBIN ENG UNIV