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Ultra-short baseline underwater sound source positioning method based on two-dimensional arbitrary array space

A technology of ultra-short baseline positioning and ultra-short baseline, which is applied in multi-disciplinary fields and can solve the problem that the orthogonality of signal and noise is not absolutely satisfied.

Pending Publication Date: 2021-09-10
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the signal processing of the ultra-short baseline underwater sound source is aimed at the broadband signal without any modulation in the ocean channel propagation, and the orthogonality between the signal and the noise is not absolutely satisfied

Method used

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  • Ultra-short baseline underwater sound source positioning method based on two-dimensional arbitrary array space
  • Ultra-short baseline underwater sound source positioning method based on two-dimensional arbitrary array space
  • Ultra-short baseline underwater sound source positioning method based on two-dimensional arbitrary array space

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Embodiment 1

[0073] exist figure 1 Under the experimental parameters of , example 1 uses different sound source positions from different combinations of x-coordinates, y-coordinates, and z-coordinates to perform ultra-short baseline positioning. The specific experimental conditions of its embodiment are described as follows:

[0074] The signal data transmitted from 180 positions combined by x=[-5000:2000:5000], y=[-5000:2000:5000], z=[1000:1000:5000] pass through 4 array elements respectively The composed cross-like array receiving array receives, and the elevation angle and azimuth angle of the 180 positions are calculated by trigonometric functions. The additional noise on the sensor array is formed by the superposition of Gaussian noise (background noise) on these four array elements. Experiments were carried out at a signal-to-noise ratio of 10dB.

[0075] Such as figure 2 As shown, in this embodiment, the present invention is compared with the positioning results under the delay...

Embodiment 2

[0077] In Example 2, the positioning accuracy of the present invention under different signal-to-noise ratios is analyzed experimentally. The position is fixed as (600, 800, 1000), and the corresponding pitch angle and azimuth angle are 53.1301° and 45° respectively. For the measurement of positioning accuracy, the difference between the estimated value and the theoretical value is compared with the ratio of the slope distance, which are: Δx / R, Δy / R, Δz / R. Its positioning slope distance accuracy under different signal-to-noise ratios (-20dB-20dB) is as follows: image 3 As shown, it can be seen that the positioning accuracy of the method of the present invention is lower than that of the GCC algorithm and the MUSIC algorithm under the ISM. The estimated position corresponding to the signal-to-noise ratio of the experimental part is shown in Table 2.

[0078] Table 2 The comparison of the positioning estimation position of the present invention and traditional technology

[0...

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Abstract

The invention discloses an ultra-short baseline underwater sound source positioning method based on a two-dimensional arbitrary array space, and belongs to the multidisciplinary crossing field of array signal processing, oceanography and the like. According to the invention, an ultra-short baseline positioning system is adopted, an array structure in a quaternary cross array form is designed, and any array mode is adopted to obtain a received signal; and for a pitch angle and an azimuth angle theta of an incident signal, a focusing matrix is constructed by using a coherent signal subspace method based on a subspace-like MUSIC algorithm to focus broadband multi-frequency to a center frequency f0, and for a focused broadband signal, a two-dimensional angle joint spatial spectrum function is constructed by using a two-dimensional MUSIC improved algorithm, source target space positioning is carried out on broadband signals propagated underwater, and the problem that the precision of ocean broadband signal space positioning is insufficient is solved. Compared with a mainstream method based on time delay inequality, the ultra-short baseline underwater sound source positioning method based on the two-dimensional arbitrary array space can identify broadband signals under the condition of signal and noise coherence, and the positioning precision of the ultra-short baseline underwater sound source positioning method based on the two-dimensional arbitrary array space is higher than that of other comparison algorithms under the condition of different signal-to-noise ratios.

Description

technical field [0001] The invention belongs to multi-disciplinary interdisciplinary fields such as array signal processing and oceanography, and in particular relates to a method for locating an underwater sound source with an ultra-short baseline based on a two-dimensional arbitrary array space. Background technique [0002] In the marine environment, due to the attenuation of the propagation of electromagnetic waves and light waves by the ocean medium, land devices such as GPS cannot be used in the ocean. The propagation attenuation of sound waves in the ocean is weak, so acoustic components can be used to detect, identify, locate and track underwater targets. [0003] The positioning problem in the shallow ocean is a basic problem in marine scientific research and technology application, and an important field of application is the positioning problem of underwater vehicles. An underwater glider is an efficient marine vehicle, using movable internal masses and net buoya...

Claims

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Application Information

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IPC IPC(8): G01S5/20
CPCG01S5/20Y02A90/30
Inventor 黄俊达姜龙玉
Owner SOUTHEAST UNIV
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