Underwater DOA Estimation Method and Device Based on Angle Adjustable Non-uniform Linear Array

A technology of direction of arrival estimation and uniform linear array, which is applied to systems for determining direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, etc. The effect of high accuracy and improved angular resolution

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the research of underwater DOA estimation methods based on non-uniform linear arrays, orthogonal linear arrays with fixed right angles are mostly used. At the same time, the underwater sound velocity is assumed to be a known quantity in the algorithm. In fact, the underwater environment is very complicated. The speed of sound is also constantly changing, so using a fixed angle and a fixed speed of sound will reduce the estimation accuracy

Method used

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  • Underwater DOA Estimation Method and Device Based on Angle Adjustable Non-uniform Linear Array

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Embodiment 1

[0074] The invention adopts two non-uniform line arrays with adjustable included angles, the narrow-band target sound source is S, and the center frequency is f. The included angle between the incident direction of the sound wave and the positive axis direction of the horizontal non-uniform linear array is β, β∈(0, π); the method of the present invention will measure N different linear array included angle values ​​α n ,n=1,2,...,N and α n ∈(0,π / 2), the specific steps are as follows:

[0075] Step 1: Establish a signal receiving model of an adjustable non-uniform line array. Such as figure 1 As shown, two angles are placed in water with an angle of α n The non-uniform line array of , a non-uniform line array in the horizontal direction and a non-uniform line array in the inclined direction are respectively set as x-axis and y-axis. Both non-uniform linear arrays have M receiving array elements, and the positions of the first to m-th array elements of the horizontal non-uni...

Embodiment 2

[0151] The underwater direction-of-arrival estimation device based on the adjustable non-uniform linear array provided by the present invention includes a data processing and control module, a transmitting module, a receiving module, an output module and a power supply module, such as Figure 10 with Figure 11 shown.

[0152]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 to make the transmitting module emit the specified signal; control the angle-adjustable linear array of the receiving module so that the angle between the two non-uniform linear arrays can be turned to the set value; it can also control the signal transmitted by the receiving module Processing, the direction of arrival angle is calculated by the method of the present invention, and then the result is transmitted to the ou...

Embodiment 3

[0159] The device of the invention includes 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 stepping motor in the receiving module adopts Toshiba's 23HY6606-CP motor, the step angle of this stepping motor is 1.8 degrees, and the stepping motor drive circuit adopts Toshiba's TC78S600FTG chip . In addition, the receiving module also uses two non-uniform linear arrays with adjustable angles, each of which includes multiple ultrasonic receiving probes, and the number is the same, and the two non-uniform arrays are divided by Figure 12 Assembled as shown; the transmitting mod...

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Abstract

The invention discloses a method and device for estimating the underwater direction of arrival based on an adjustable angle non-uniform line array. A two-dimensional angle adjustable non-uniform line array is used as a receiving array and applied to two line arrays respectively. ESPRIT algorithm, and then according to the angle relationship between the two linear arrays, the final result has nothing to do with the underwater sound velocity, which realizes the improvement of the traditional ESPRIT algorithm. At the same time, due to the use of the line array with adjustable angle, the angle between the two line arrays can be changed for multiple measurements, so as to better eliminate the estimation error. The invention combines the advantages of the angle-adjustable line array and the non-uniform line array, has high estimation accuracy and strong practicability.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to an underwater direction-of-arrival estimation method and device based on an adjustable angle-adjustable non-uniform 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. The method of placing sensor arrays on the water surface and using array signal processing technology to estimate the orientation of underwater targets is underwater DOA estimation. The existing underwater DOA estimation methods mainly include MUSIC algorithm and ESPRIT algorithm. They both belong to the characteristic subspace algorithm. This type of algorithm divides the received data into two mutually orthogonal subspaces through the mathematical decomposition of the array received data (such as singular value decomposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 宁更新李晓鹏
Owner SOUTH CHINA UNIV OF TECH
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