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Underwater one-dimensional DOA estimation method and device based on non-circular signal and L-shaped line array

A non-circular signal and linear array technology, applied in direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve the problems of rapid signal attenuation, sound velocity, influence, etc., and achieve accurate estimation results

Active Publication Date: 2019-03-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of rapid signal attenuation and sound velocity in the underwater acoustic environment, and provide an underwater One-dimensional DOA estimation method and device

Method used

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  • Underwater one-dimensional DOA estimation method and device based on non-circular signal and L-shaped line array
  • Underwater one-dimensional DOA estimation method and device based on non-circular signal and L-shaped line array
  • Underwater one-dimensional DOA estimation method and device based on non-circular signal and L-shaped line array

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Embodiment 1

[0067] This embodiment proposes a one-dimensional underwater direction-of-arrival estimation method based on non-circular signals and L-shaped linear arrays. By processing the non-circular received signals of two uniform sub-linear arrays respectively, the DOA direction-of-arrival estimation method The factor of sound speed is eliminated in the middle, so as to eliminate the influence of underwater sound speed uncertainty on the target positioning accuracy. At the same time, due to the non-circular characteristics, the array aperture can be expanded, the estimated number of signal sources can be improved, and errors can be better eliminated in actual measurement.

[0068] as attached Figure 6 As shown, in this embodiment, the underwater one-dimensional DOA estimation method based on the non-circular signal and the L-shaped linear array in an unknown sound velocity environment includes the following steps:

[0069] S1. Respectively establish the non-circular signal data recei...

Embodiment 2

[0107] This embodiment discloses a one-dimensional underwater direction-of-arrival estimation device based on a non-circular signal and an L-shaped uniform linear array, including a data processing and control module, a transmitting module, a receiving module, an output module and a power supply module, such as figure 1 and figure 2 shown.

[0108] The data processing and control module is composed of a pair of A / D, D / A converter and a processor, which is the core part of the whole device, and all other modules are directly connected with it. It can control the transmitting module, so that the transmitting module transmits a specified non-circular signal; at the same time, it can process the signal transmitted by the receiving module, calculate the direction of arrival angle through the underwater one-dimensional DOA estimation method disclosed in the present invention, and then calculate the result to the output module.

[0109] The receiving module includes two arrays of ...

Embodiment 3

[0115] This embodiment specifically discloses an underwater one-dimensional DOA estimation device based on a non-circular signal and an L-shaped uniform linear array, including a data processing and control module, a transmitting module, a receiving module, an output module and a power supply module. The data processing and control module can be implemented with a DSP chip (for example: DSP chip of TI company TMS320VC5509A type), this DSP chip can realize the functions of A / D conversion and D / A conversion, and can realize the rotation operator of non-uniform linear array and the calculation of the final direction of arrival. The receiving module uses two fixed and L-shaped uniform linear arrays, each of which includes multiple ultrasonic receiving probes, and the number is the same, and the two uniform arrays are figure 2 Assembled as shown. The transmitting module uses an ultrasonic transmitting probe. The output module uses a USB interface and an LCD display. figure 1 It...

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Abstract

The invention discloses an underwater one-dimensional DOA estimation method and device based on a non-circular signal and an L-shaped line array. The method applies the non-circular signal to underwater DOA estimation to overcome the problem of rapid signal attenuation in a hydroacoustic environment. The non-circular characteristic of the signal is fully utilized. The effect of array aperture expansion can be acquired, so that the underwater DOA estimation result is accurate. An NC-ESPRIT algorithm based on the non-circular signal is adopted to improve the estimation performance. At the same time, in order to eliminate the estimation deviation caused by the influence of sound speed, the L-shaped uniform line array whose angle can be adjusted is used in the invention. The variable of speedsound is eliminated through the angular relationship between two sub-arrays and the arrival direction angle, so that the final operation result has nothing to do with sound speed. The estimation accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to a method and device for underwater one-dimensional DOA estimation in an unknown sound velocity environment based on a non-circular signal and an L-shaped linear array. Background technique [0002] Array signal processing technology has been widely used in many fields, and one of the basic problems of array signal processing is the direction of arrival (DOA estimation) of space signals. Underwater DOA estimation refers to the method of placing sensor arrays on the water surface and using array signal processing technology to estimate the orientation of underwater targets. [0003] Due to the complexity of the underwater acoustic environment, the frequency attenuation of the signal is particularly serious when it propagates in the underwater environment. In addition, various obstacles in the underwater acoustic channel and the sound wave scattering effect caused by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 宁更新姜伸接
Owner SOUTH CHINA UNIV OF TECH
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