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Continental shelf slope sea area underwater target azimuth estimation method

A technology for underwater target and azimuth estimation, which is applied to systems for determining direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, etc. Target positioning and other issues to achieve the effect of improving the estimation error

Pending Publication Date: 2021-11-30
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, due to the existence of the slope seabed, the horizontal refraction effect will be produced when the sound wave collides with the seabed during the propagation process, causing the sound ray to deflect in the horizontal plane, resulting in the estimated target azimuth seriously deviating from the real azimuth angle
The paper "Sound Field Modeling and Horizontal Refraction Effect Analysis on the Acoustic Vector Field in Elastic Submarine Wedge Sea Area" points out that due to the existence of wedge-shaped seabed, the estimated azimuth angle will deviate from the real azimuth by more than 20 degrees in some areas, and it is difficult for the existing technology to solve the problem. Accurate positioning of targets entering the continental slope sea area

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  • Continental shelf slope sea area underwater target azimuth estimation method
  • Continental shelf slope sea area underwater target azimuth estimation method
  • Continental shelf slope sea area underwater target azimuth estimation method

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[0058] The present invention first performs modal separation on the received signals of all array elements, performs Warping transformation on the signals received by each array element to transform the received signals into the Warping domain, and the frequency corresponding to the normal wave of each order in the Warping domain is its cut-off frequency, so the modes The states are separable from each other, and the single-order modal Warping domain signal can be obtained by filtering in the frequency domain. Then, the Warping inverse transform is performed on the signal in the single-order Warping domain to obtain the single-order modal received signal. By performing beamforming on the single-order modal signal, the beam response at different azimuth angles is obtained, and finally the direction of arrival of the single-order modal signal is obtained. Combined with the transmission characteristics of the sound field in the slope sea area, the estimation result closest to the ...

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Abstract

The invention relates to a continental shelf slope sea area underwater target azimuth estimation method, which aims at solving the problem of slope sea area underwater target azimuth estimation, applies a normal wave mode separation technology to a slope sea area horizontal array receiving signal, separates different orders of modes, and then eliminates high-order modes greatly influenced by horizontal refraction. A low-order mode which is slightly influenced by horizontal refraction is reserved, because the low-order mode is approximately propagated along the direction of the connecting line of the sound source and the receiving point, the method can significantly improve the target orientation estimation error. Simulation results show that in a typical actual marine environment, compared with a traditional method, the method can reduce the target orientation estimation error from 7.7 degrees to 1.5 degrees. The method is expected to provide technical support for azimuth estimation of the underwater target in the slope sea area.

Description

technical field [0001] The invention belongs to the field of ships and ocean engineering, and relates to a method for estimating the azimuth of an underwater target in the continental shelf slope sea area. Background technique [0002] The slope of the continental shelf is the transition zone connecting the land and the deep-sea plain. The sea area where it is located is called the slope of the continental shelf. This sea area is the only way for our navy to go from the shallow sea to the deep sea. Near my country's offshore areas, the continental slope waters are also the only way to go, and the precise positioning of underwater targets entering my country's offshore waters is of great significance for our army's early warning and precise strikes. However, due to the existence of the slope seabed, the horizontal refraction effect will be produced when the sound wave collides with the seabed during the propagation process, causing the sound ray to deflect in the horizontal pl...

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Application Information

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IPC IPC(8): G01S3/802
CPCG01S3/802Y02A90/30
Inventor 周建波杨益新
Owner NORTHWESTERN POLYTECHNICAL UNIV
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