Shallow sea horizontal array passive positioning method and system based on spatial domain deconvolution processing

A passive positioning and deconvolution technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as low precision and poor robustness

Pending Publication Date: 2020-12-18
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The existing technology has problems such as low precision and poor robustness in solving the passive positioning of horizontal arrays in shallow seas

Method used

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  • Shallow sea horizontal array passive positioning method and system based on spatial domain deconvolution processing
  • Shallow sea horizontal array passive positioning method and system based on spatial domain deconvolution processing
  • Shallow sea horizontal array passive positioning method and system based on spatial domain deconvolution processing

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Embodiment 1

[0074]Such asfigure 1 As shown, Embodiment 1 of the present invention proposes a shallow-sea horizontal array passive positioning method based on spatial deconvolution processing.

[0075](1) Matrix invariant

[0076]In the array invariant method, the distance from the sound source to the array roCan be obtained by

[0077]

[0078]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.

[0079]The array invariant χ is a scalar parameter representing the dispersion characteristics 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 end fire direction, the measurement angle of the arrayIt can be expressed by glancing angle θ and azimuth angle φ. The definition diagram of azimuth angle and glancing angle is as followsfigure 2 Shown.

[00...

Embodiment 2

[0119]Based on the above system, Embodiment 2 of the present invention proposes a shallow sea horizontal array passive positioning system based on spatial deconvolution processing. The system includes: N-element horizontal uniform linear array, signal spectrum analysis module, blind deconvolution calculation module, deconvolution processing module, array invariant calculation module and target distance calculation module; among them,

[0120]The N-element horizontal uniform linear array is used to receive the radiation signal of the target sound source in the underwater sound field;

[0121]The signal spectrum analysis module is used to analyze the sound pressure signal spectrum collected by the hydrophone to obtain the received signal spectrum of each array element;

[0122]The blind deconvolution calculation module is configured to obtain an estimated value of Green's function in the frequency domain through blind deconvolution calculation according to the received signal spectrum;

[0123]Th...

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Abstract

The invention discloses a shallow sea horizontal array passive positioning method and system based on spatial domain deconvolution processing, and the method comprises the 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 to the frequency spectrum of the received signal; carrying out inverse Fourier transform on the estimated value of the frequency domain Green function, extracting target multipath relative incident time from the obtained array element time domain Green function, and then calculating a target multipath incident angle through a deconvolution processing method; calculating to obtain an array invariantaccording to the target multipath incident angle; and calculating the distance of the target sound source according to the array invariant, thereby realizing positioning of the target sound source. According to the method, steady passive positioning under the shallow sea small-aperture horizontal array condition is realized, and higher passive positioning precision is obtained under the conditionthat the calculated amount is not remarkably increased.

Description

Technical field[0001]The invention relates to the field of passive sonar systems and the field of passive positioning of underwater targets, in particular to a method and system for passive positioning of a shallow sea horizontal array based on airspace deconvolution processing.Background technique[0002]Passive positioning of underwater targets is one of the key functions of passive sonar, and it is also the basis for subsequent positioning and tracking functions. Passive positioning methods include traditional three-element method, matching field processing, waveguide invariant-based methods, and machine learning-based methods. The prior art has the problems of low accuracy and poor robustness in solving the passive positioning of shallow sea horizontal arrays. Due to its low environmental sensitivity, the method based on array invariants can achieve many advantages such as positioning in a small time window and low calculation amount, and it has received extensive attention in rec...

Claims

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Application Information

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