Array invariant passive positioning method and system based on Green function two-dimensional deconvolution

A technology of Green's function and array invariance, which is applied in the direction of radio wave measurement system, measurement device, sound wave reradiation, etc., and can solve the problem of low passive positioning accuracy

Pending Publication Date: 2020-12-04
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] Aiming at the problem of low passive positioning accuracy under complex shallow sea conditions in the prior art, the purpose of the present invention is to overcome the above-mentioned defects in the prior art, and propose an array-invariant passive positioning method and system based on Green's function two-dimensional deconvolution

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  • Array invariant passive positioning method and system based on Green function two-dimensional deconvolution
  • Array invariant passive positioning method and system based on Green function two-dimensional deconvolution
  • Array invariant passive positioning method and system based on Green function two-dimensional deconvolution

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Embodiment 1

[0069] like figure 1 As shown, Embodiment 1 of the present invention provides an array-invariant passive positioning method based on Green's function two-dimensional deconvolution processing.

[0070] (1) array invariant

[0071] In the array invariant method, the distance r from the sound source to the array o can be obtained by the following formula

[0072]

[0073] Where c is the sound velocity of the environment, χ is the array invariant, and β is the waveguide invariant. For an ideal shallow water environment where the waveguide interacts with the bottom water surface, β≈1 here.

[0074] The array invariant χ is a scalar parameter representing the dispersion properties of the waveguide, which is defined as the derivative of the glancing angle θ with respect to time. For a horizontal array and the sound source is not in the endfire direction, the measured angle of the array It can be represented by the grazing angle θ and the azimuth angle φ. The definition diag...

Embodiment 2

[0114] Based on the method of embodiment 1, embodiment 2 of the present invention proposes an array-invariant passive positioning system based on Green's function two-dimensional deconvolution. The system includes: N-element horizontal uniform linear array, signal spectrum analysis module, blind deconvolution calculation module, two-dimensional deconvolution processing module, array invariant calculation module and target distance calculation module; among them,

[0115] The N-element horizontal uniform line array is used to receive the radiation signal of the target sound source in the underwater sound field;

[0116] The signal spectrum analysis module is used to obtain the received signal spectrum of each array element by analyzing the sound pressure signal spectrum collected by the hydrophone;

[0117] The blind deconvolution calculation module is used to obtain the estimated value of the Green's function in the frequency domain through blind deconvolution calculation acco...

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Abstract

The invention discloses an array invariant passive positioning method and system based on Green function two-dimensional deconvolution. The method comprises the following steps: receiving a radiationsignal of a target sound source in an underwater sound field through an N-element horizontal uniform linear array, and obtaining a received signal frequency spectrum of each array element through thefrequency spectrum analysis of a sound pressure signal collected by a hydrophone; obtaining an estimated value of a frequency domain Green function through blind deconvolution calculation according tothe frequency spectrum of the received signal; performing two-dimensional deconvolution processing on the estimated value of the frequency domain Green function to obtain an incident angle and relative incident time of each oblique line of the time domain Green function; calculating to obtain an array invariant according to the incident angle and the relative incident time of each oblique line ofthe time domain Green function; and calculating the distance of the target sound source through the array invariant to realize the positioning of the target sound source. According to the method, thepassive target positioning precision is remarkably improved, the method can be used for a horizontal array and a vertical array, and the advantages are more prominent under the condition that the horizontal array is moved through a small aperture.

Description

technical field [0001] The invention relates to the field of passive sonar systems, in particular to the field of passive positioning of underwater targets, in particular to an array-invariant passive positioning method and system based on Green's function two-dimensional deconvolution. Background technique [0002] Passive positioning of underwater targets is one of the key functions of passive sonar, and it is also the basis for realizing subsequent positioning and tracking functions. Passive positioning methods include the traditional three-array element method, matching field processing, waveguide invariant-based methods, machine learning-based methods, and array invariant-based methods. The method based on array invariants has received extensive attention in recent years due to its low environmental sensitivity, positioning and low computation in a small time window, and many other advantages. Contents of the invention [0003] Aiming at the problem of low passive po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539G01S15/08
CPCG01S7/539G01S15/08
Inventor 王宇杰迟骋李宇黄海宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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