Underwater DOA estimation based on noncircular signal and adjustable-included-angle array and device thereof

A non-circular signal and included angle technology, which is applied in direction finders using ultrasonic/sonic/infrasonic waves, etc., can solve problems such as rapid signal attenuation and sound velocity influence

Pending Publication Date: 2019-03-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a one-dimensional DOA estimation method and device for underwater sound velocity based on non-circular signals an...

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  • Underwater DOA estimation based on noncircular signal and adjustable-included-angle array and device thereof
  • Underwater DOA estimation based on noncircular signal and adjustable-included-angle array and device thereof
  • Underwater DOA estimation based on noncircular signal and adjustable-included-angle array and device thereof

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Embodiment 1

[0091] This embodiment proposes a one-dimensional underwater DOA estimation method based on non-circular signals and angle-adjustable uniform linear arrays. By processing the non-circular receiving signals of two uniform sub-linear arrays, the The factor of sound velocity is eliminated in the direction estimation method, thereby eliminating the influence of underwater sound velocity uncertainty on 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. In addition, the two-dimensional array with adjustable angle can be used for flexible measurement. By changing the angle between the two-dimensional linear arrays for multiple measurements, the purpose of improving the estimation performance can be achieved.

[0092] as attached Figure 7 As shown, in this embodiment, the underwater one-dimensional...

Embodiment 2

[0147] This embodiment discloses an underwater one-dimensional DOA estimation device based on a non-circular signal and an adjustable two-dimensional line array. The estimation device includes a data processing and control module, a transmitting module, a receiving module, an output module and power module.

[0148]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 transmitter module, so that the transmitter module can emit the specified signal; it can control the angle-adjustable line array of the receiver module, so that the line array 1 remains fixed, and the line array 2 rotates on the plane with the connection point as the center, and turns to Set value; at the same time, it can process the signal transmitted from the receiving module, calculate the one-dimensional direction of arrival angle through the under...

Embodiment 3

[0156] This embodiment specifically discloses an underwater one-dimensional DOA estimation device based on a non-circular signal and an angle-adjustable uniform linear array, including a data processing and control module, a transmitting module, a receiving module, an output module and a power supply module.

[0157] The data processing and control module is realized by DSP chip (for example: DSP chip of TI company TMS320VC5509A type), this DSP chip can realize the function of A / D conversion and D / A conversion, and can realize the rotation operator and Calculation of final direction of arrival.

[0158] The stepping motor in the receiving module adopts Toshiba's 23HY6606-CP motor, the stepping angle of this stepping motor is 1.8 degrees, and the stepping motor drive circuit adopts Toshiba's TC78S600FTG chip.

[0159] The receiving module adopts a two-dimensional linear array with adjustable angle, where each array includes a plurality of ultrasonic receiving probes, and the nu...

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Abstract

The invention discloses an underwater DOA estimation method based on a noncircular signal and an adjustable-included-angle array and a device thereof. According to the estimating device, an adjustable-included-angle two-dimensional array is adopted in a receiving module. The array can perform flexible measurement. Through changing the included angle between the two-dimensional arrays and performing multiple measurements, a purpose of improving estimation performance can be realized. For overcoming a problem of signal attenuation in an underwater acoustic environment, a noncircular signal is applied to underwater DOA estimation, and an NC-ESPRIT algorithm based on the noncircular signal is utilized for improving estimation performance. For eliminating an estimation error caused by sound speed influence, a one-dimensional DOA estimation expression which is unrelated with the sound speed is utilized, thereby improving underwater DOA estimation precision. In one word, the adjustable-included-angle two-dimensional uniform array is utilized, and furthermore the advantage of noncircular signal is utilized; optimization which is unrelated with the sound speed is performed according to theunderwater environment. The underwater DOA estimation method and the device thereof have advantages of high estimation precision and relatively high practicability.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to an underwater DOA estimation method and device based on an adjustable angle-adjustable two-dimensional linear array and a non-circular signal in an unknown sound velocity environment. 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 complex and unstable underwater environments such as rivers and oceans, the speed of sound waves varies with position and time, and the estimation accuracy of underwater DOA algorithms is greatly affected. The current underwater DOA estimation methods generally ass...

Claims

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Application Information

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IPC IPC(8): G01S3/80
CPCG01S3/80
Inventor 宁更新姜伸接
Owner SOUTH CHINA UNIV OF TECH
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