Underwater direction-of-arrival estimation method and device based on uniform linear arrays with adjustable included angle

A direction-of-arrival estimation and uniform linear array technology, which is applied to measuring devices, radio wave measuring systems, and direction-determining orientators, etc., can solve problems such as low accuracy, errors, and inability to effectively improve estimation accuracy.

Active Publication Date: 2018-05-08
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] However, the existing methods for DOA estimation using the ESPRIT algorithm have the problem of low accuracy. On the one hand, in the process of DOA estimation using the ESPRIT algorithm, the propagation speed of the signal in the medium needs to be regarded as a known parameter. In the underwater environment, the sound velocity is related to many environmental factors and is a constantly changing parameter. Therefore, using a fixed sound velocity parameter for underwater DOA estimation will produce large errors.
On the other hand, the existing linear arrays used for DOA estimation are all fixed angles. In the actual measurement process, only multiple measurements can be made for this fixed angle, which cannot effectively improve the estimation accuracy.

Method used

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Examples

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Effect test

Embodiment 1

[0100] An underwater direction-of-arrival estimation method based on a uniform linear array with an adjustable angle. By processing the received signals of the two linear arrays, the factor of sound velocity can be eliminated in the direction-of-arrival estimation, thereby eliminating the uncertainty of underwater sound velocity influence on the target positioning accuracy. Secondly, because the included angle between the two uniform linear arrays is variable, the included angle can be changed for multiple measurements in actual measurement to better eliminate errors.

[0101] This method adopts two uniform line arrays with adjustable angles, both line arrays have M array elements and the distance between the array elements is d; the K narrowband target sound sources are respectively S 1 ,S 2 ,...,S K , the center frequency is f; the angle between the incident direction of the sound wave and the positive axis of the horizontal uniform line array is β,β∈(0,π); this method wil...

Embodiment 2

[0163] The underwater direction-of-arrival estimation device based on the adjustable angle uniform linear array provided in this embodiment is as follows: figure 1 As shown, it includes data processing and control module, angle control module, transmitting module, receiving module, output module and power supply module.

[0164] 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 can emit a specified signal; it can control the angle control module, so that the angle between the two uniform linear arrays can be turned to a set value; it can also process the signal transmitted by the receiving module, through embodiment 1 The algorithm calculates the angle of arrival, and then transmits the result to the transmitting module.

[0165] The angle control module is us...

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PUM

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Abstract

The invention discloses an underwater direction-of-arrival estimation method and device based on uniform linear arrays with an adjustable included angle. According to the invention, two uniform lineararrays with an adjustable included angle are adopted, the variable of sound velocity is eliminated through the relationship between an included angle of the two arrays and the direction-of-arrival angle, so that the final calculation result has nothing to do with the sound velocity, and in this way, the estimation accuracy is increased. At the same time, due to the variable included angle betweenthe two linear arrays, multiple measurements can be taken by taking different values, and errors can be better eliminated.

Description

technical field [0001] The invention relates to the technical field of underwater target positioning, in particular to an underwater direction-of-arrival estimation method and device based on an adjustable angle 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. DOA estimation, that is, spatial spectrum estimation, adopts a processing method of placing multiple sensors in a noisy environment to form an array to receive the target signal, and then process the received signal of the array, and finally estimate the target signal relative to the array. direction of incidence. The subspace decomposition algorithm is a high-resolution method developed in the 1970s. It can accurately estimate the parameters of the signal (frequency, orientation, etc.), and its performance is ideal, and its r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/803
CPCG01S3/8034Y02D30/70
Inventor 宁更新李晓鹏谭纬城张军冯义志季飞
Owner SOUTH CHINA UNIV OF TECH
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