CN-121995317-A - Active inversion method of typical deep sea sound velocity profile based on reliable sound path

CN121995317ACN 121995317 ACN121995317 ACN 121995317ACN-121995317-A

Abstract

An active inversion method of a typical deep sea sound velocity profile based on a reliable sound path relates to marine environment parameter acoustic inversion. The method comprises the steps of obtaining sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves under different deep sea sound velocity profiles through simulation based on sea mode data or measured data and combining with a sound propagation model, arranging a vertical receiving array carrying an active sound source on the deep sea seabed, obtaining measured sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves after wave beam forming by utilizing sea surface scattering echo obtained through active emission, comparing the sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves to obtain sound velocity profile expression parameters under optimal matching of the two-dimensional curves, and obtaining deep sea sound velocity profile estimation by utilizing the expression parameters. The full water depth sound velocity profile can be obtained without a measurement system covering the full water body. The acoustic velocity profile of the deep sea water body between the receiving and transmitting can be estimated on a system that a single receiving and transmitting device is placed on the seabed without using a traditional receiving and transmitting split double submerged buoy system.

Inventors

WENG JINBAO
RUAN HAILIN
YANG YANMING
CHEN BENQING
XU DEWEI
ZHENG LINGHONG
Pei Shengxin

Assignees

自然资源部第三海洋研究所

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (1)

1. An active inversion method of a typical deep sea sound velocity profile based on a reliable sound path is characterized by comprising the steps of obtaining a sea surface scattering echo arrival pitch angle and arrival time two-dimensional curve by utilizing a deep sea seabed active and passive combination vertical array platform, obtaining sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves under different deep sea sound velocity profiles by utilizing a sea mode or measured data through simulation calculation, and obtaining deep sea sound velocity profile estimation by matching the sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves which are measured and simulated, wherein the method specifically comprises the following steps of: 1) Aiming at a middle latitude deep sea area of a test, analyzing a deep sea sound velocity profile change rule based on a sea mode or actual measured sound velocity profile data, extracting a parameter change range of the deep sea sound velocity profile, including a constant sound velocity layer thickness, a constant sound velocity layer sound velocity and a jump layer change quadratic function coefficient, and calculating sea echo arrival pitch angles and arrival times of different deep sea sound velocity profiles under different parameters as a copy field for matching estimation of the deep sea sound velocity profile by using a ray sound propagation model based on a preset system platform working depth and the sea depth of the test sea area; 2) Firstly, laying a vertical receiving array carrying an active sound source on the seabed of a test sea area, generating sound signals by using the active sound source, collecting sea surface scattering echo signals by using the vertical receiving array, obtaining actual measurement data of arrival pitch angle and arrival time of the sea surface scattering echo after beam forming by using a synchronous vertical array, and collecting the deep sea sound velocity profile of the test sea area in the test process; 3) The method comprises the steps of carrying out matching comparison on two-dimensional curve data of the arrival time and the arrival pitch angle of the sea surface scattering echo obtained through simulation and two-dimensional curve data of the arrival time and the arrival pitch angle of the sea surface scattering echo under different deep sea sound velocity profiles, obtaining optimal matching when the sum of the arrival time differences of different angles reaches minimum, calculating to obtain deep sea sound velocity profile parameters under the optimal matching of the two, calculating to obtain an estimated deep sea sound velocity profile according to the parameters, comparing the estimated deep sea sound velocity profile with the actual deep sea sound velocity profile, analyzing errors, obtaining sea surface scattering echo signals in a reliable sound path range by utilizing a sea surface active emission sound source, and obtaining arrival pitch angle and arrival time information of the sea surface scattering echo signals, which are carried by different angles and pass through a water body, through array processing by utilizing an integrated passive vertical array.

Description

Active inversion method of typical deep sea sound velocity profile based on reliable sound path Technical Field The invention relates to an acoustic inversion method of a deep sea area sound velocity profile based on a reliable sound path, in particular to an inversion method for obtaining a sea surface scattering echo arrival pitch angle and arrival time curve by utilizing a receiving and transmitting combined submarine platform and a vertical receiving array thereof, obtaining sea surface scattering echo arrival pitch angle and arrival time copying fields under different deep sea sound velocity profiles by utilizing marine environment data, and obtaining deep sea sound velocity profile estimation by matching the sea surface scattering echo arrival pitch angle and arrival time two-dimensional curve. Background For active and passive detection systems based on reliable acoustic paths, the active and passive detection systems are often deployed on the deep sea bottom, and remote detection is achieved by using lower propagation losses in the direct acoustic region. Ideally, the detection system is located near the sea floor throughout the year, with unknown changes to the deep sea acoustic velocity profile. However, the target of interest of the detection system is mainly located on the deep sea surface, and the surface acoustic velocity profile changes obviously with time, and the change of the acoustic velocity profile influences the target distance and depth estimation accuracy of the detection system by influencing the propagation glancing angle and propagation time of the acoustic line. Therefore, development of a deep sea acoustic velocity profile inversion method based on a reliable acoustic path mode is needed. The conventional deep sea sound velocity profile inversion method mainly uses long-distance horizontal sound propagation signals, the equipment estimates the deep sea sound velocity profile by using sound rays or the propagation characteristics and parameters of simple positive waves through a matching method, and generally only a large-range horizontal average result can be obtained. In order to obtain and improve the inversion precision of the deep sea sound velocity profile in a small area, the patent proposes an active detection mode utilizing a reliable sound path, sound rays with different angles are emitted to the sea surface by a sound source and are scattered back to a submarine receiving vertical array, a two-dimensional curve of an arrival pitch angle and arrival time of a sea scattering echo is obtained, namely, sound ray propagation time of the whole deep sea water body passing through different angles is obtained, and the deep sea sound velocity profile estimation is obtained by matching the two-dimensional curve. Disclosure of Invention The invention aims to solve the problems of high cost and difficult arrangement of a receiving and transmitting separated submerged buoy in the prior art, and provides a deep sea sound velocity profile inversion method which utilizes a reliable sound path and is suitable for a local small range of a deep sea submarine platform, wherein a single-node platform system which is initially arranged and is simple in arrangement can be utilized to obtain the deep sea sound velocity profile of the reliable sound path covering the sea area range. The invention comprises the following steps: 1) Aiming at a middle latitude deep sea area of a test, analyzing a deep sea sound velocity profile change rule based on a sea mode or actual measured sound velocity profile data, extracting a parameter change range of the deep sea sound velocity profile, including a constant sound velocity layer thickness, a constant sound velocity layer sound velocity and a jump layer change quadratic function coefficient, and calculating sea echo arrival pitch angles and arrival times of different deep sea sound velocity profiles under different parameters as a copy field for matching estimation of the deep sea sound velocity profile by using a ray sound propagation model based on a preset system platform working depth and the sea depth of the test sea area; 2) Firstly, laying a vertical receiving array carrying an active sound source on the seabed of a test sea area, generating sound signals by using the active sound source, collecting sea surface scattering echo signals by using the vertical receiving array, obtaining actual measurement data of arrival pitch angle and arrival time of the sea surface scattering echo after beam forming by using a synchronous vertical array, and collecting the deep sea sound velocity profile of the test sea area in the test process; 3) The method comprises the steps of carrying out matching comparison on two-dimensional curve data of the arrival time and the arrival pitch angle of the sea surface scattering echo obtained through simulation and two-dimensional curve data of the arrival time and the arrival pitch angle of the sea surface scattering echo