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Single-hydrophone low-frequency broadband matching field distance measurement method based on modal phase

A broadband matching, single hydrophone technology, applied in instruments, measuring devices, water resource assessment, etc., can solve the problems of difficulty and inconvenience in extracting dispersion curves, and achieve the effect of high calculation efficiency and tolerance improvement.

Pending Publication Date: 2022-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that all current dispersion curve extraction methods require a certain degree of manual assistance, and it is difficult to extract dispersion curves under unfavorable conditions such as short-distance reception or low signal-to-noise ratio (LIANG N, YANG Y, ZHOU J, et al.A time-frequency analysis approach to dispersion curve estimation for single-hydrophone acoustic signals in shallow water[J].JASA Express Letters,2021,1(1):016005.)
Therefore, there is a certain inconvenience in the application of the method based on the dispersion curve ranging

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  • Single-hydrophone low-frequency broadband matching field distance measurement method based on modal phase
  • Single-hydrophone low-frequency broadband matching field distance measurement method based on modal phase
  • Single-hydrophone low-frequency broadband matching field distance measurement method based on modal phase

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Embodiment Construction

[0045] The present invention will now be further described in conjunction with the embodiments and accompanying drawings:

[0046] To demonstrate the implementation of the MP-MFP algorithm in a practical application scenario, the data from the South China Sea experiment in July 2021 was processed.

[0047] Step 1: Use the sensor to obtain the low-frequency broadband sound source signal and record the sound speed profile and seabed topography;

[0048] The offshore experiment site is located near (E109.1°, N17.8°), where the seabed topography gradually increases from south to north, showing an upward slope. In the experiment, the depth of the receiving hydrophone is about 52 meters, the depth of the sound source is about 11 meters, and the sound source is located about 14.7 km north of the receiving hydrophone. According to the GEBCO2020 dataset, the topographic variation between the receiving hydrophone and the sound source is as figure 1 shown. It can be seen that at a dis...

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Abstract

The invention relates to a modal phase-based single hydrophone low-frequency broadband matching field ranging method, which is characterized in that under the condition that submarine topography and a sound velocity profile are known, the MP-MFP of the modal phase-based robust and efficient single hydrophone matching field ranging method only needs to search two parameters of longitudinal wave velocity and transmit-receive horizontal distance, so that the computational efficiency is relatively high. Besides, as only the modal phase is considered and the modal amplitude is ignored, the MP-MFP slightly sacrifices the noise suppression capability, but the tolerance of the MP-MFP to environment mismatch is remarkably improved, so that the MP-MFP is more practical.

Description

technical field [0001] The invention belongs to an underwater acoustic signal processing method, and relates to a single hydrophone low-frequency broadband matching field ranging method based on modal phase. The invention relates to the processing of sound pressure signals received by hydrophones (acoustic-electric transducers used in water), in particular to a matching field method for distance measurement by using a single hydrophone to receive broadband sound pressure signals. Background technique [0002] Driven by practical demands, in the ocean, how to locate underwater sound sources has always been a research hotspot. Due to the cost advantage and the needs of some special application scenarios, single hydrophone positioning has received continuous and widespread attention, and has been applied in many aspects such as vector sound field positioning, marine mammal call positioning, and geoacoustic parameter inversion. [0003] In single hydrophone localization, a clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/08G01S15/88G06F17/15
CPCG01S15/08G01S15/88G06F17/156Y02A90/30
Inventor 杨益新梁宁宁周建波
Owner NORTHWESTERN POLYTECHNICAL UNIV