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Method for inversing sea-bottom attenuation coefficient by using modal dispersion curve energy difference

A technology of dispersion curve and attenuation coefficient, which is applied in the inversion field of seabed attenuation coefficient, can solve the problems of no inversion of seabed attenuation coefficient and insufficient use of modal dispersion curve amplitude energy information, etc.

Active Publication Date: 2016-06-01
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, the above methods are all inversion of marine environmental parameters in the case of single hydrophone and single sound source, only using the time delay information of the broadband sound source dispersion curve, and not making full use of the amplitude energy information of the modal dispersion curve. No inversion of bottom attenuation coefficients by modal dispersion energy

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  • Method for inversing sea-bottom attenuation coefficient by using modal dispersion curve energy difference
  • Method for inversing sea-bottom attenuation coefficient by using modal dispersion curve energy difference
  • Method for inversing sea-bottom attenuation coefficient by using modal dispersion curve energy difference

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Embodiment Construction

[0034] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0035] refer to figure 1 and figure 2 , using a system consisting of two explosion sound sources with an initiation depth of 50m and a hydrophone to invert the seabed attenuation coefficient. The channel environment is shallow sea, the sea depth is about 105m, the sound source depth is 50m, and the receiving depth is 48m. The receiving hydrophone is 49.6km away from the first explosion sound source and 63.4km away from the second explosion sound source; the thickness of the sediment layer is 13.9m, the sound velocity of the sediment layer is 1578.6m / s, and the density of the sediment layer is 1.6g / cm 3 , the speed of sound in the base layer is 1716.2m / s, and the density of the base layer is 2.18g / cm 3 ; The shallow sea sound velocity profile is figure 2 The sound velocity profile shown.

[0036] Referring to Figure 4 and Figure 5, it can be seen that the fi...

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Abstract

The present invention relates to a method for inversing a sea-bottom attenuation coefficient by using a modal dispersion curve energy difference, wherein inversion of a sea-bottom attenuation coefficient is implemented by using amplitude energy information of a modal dispersion curve. The present invention provides a method for inversing a sea-bottom attenuation coefficient by using an energy difference of a modal dispersion curve of two bombs, so as to estimate a sea-bottom attenuation coefficient of an experimental sea area. The method provided by the present invention focuses on inversion of a neritic zone by using a dispersion effect generated by a wide-band explosive sound source during propagation in neritic zones. The method comprises: firstly, placing a receiving hydrophone at a certain depth; then delivering explosive sound sources with the same model number parameter (considered as generating the same signal during explosion) on the same straight line and at different distances, so as to receive time-frequency maps of two explosive sound sources; then processing the time-frequency maps of the two explosive sound sources by using a warping transformation, so as to obtain a transmission energy difference of first four stages of a modal dispersion curve; and finally inversing a sea-bottom attenuation coefficient by using a modal dispersion curve energy difference.

Description

technical field [0001] The invention belongs to the inversion method of the seabed attenuation coefficient, in particular to a method for inverting the seabed attenuation coefficient by using the energy difference of the modal dispersion curve, which is suitable for shallow sea areas with relatively stable horizontal changes, and belongs to the field of hydroacoustics and hydroacoustic signal processing . Background technique [0002] The invention is mainly used for the inversion of shallow sea bottom attenuation coefficient. In underwater acoustics, the attenuation coefficient of the seabed is an important factor affecting the propagation of underwater acoustic signals, which directly affects the performance parameters of sonar equipment. Dispersion effects occur when broadband signals propagate in shallow seas. According to the normal wave theory, although the dispersion effect increases the processing difficulty of the underwater acoustic signal, the dispersion effect ...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 杨坤德郭晓乐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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