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Underwater direct-of-arrival estimation method and device based on two-dimensional orthogonal non-uniform linear array

A direction-of-arrival estimation and non-uniform technology, applied to devices with phase adjustment/time delay error compensation, direction finders using ultrasonic/sonic/infrasonic waves, etc., can solve the problem of reducing target positioning accuracy, speed change errors, Does not consider the speed impact and other issues

Active Publication Date: 2018-04-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, in these studies of DOA estimation based on non-uniform linear arrays, the MUSIC algorithm or ESPRIT algorithm used assumes that the propagation speed of the signal in the medium is constant, and does not consider the influence of the speed on the algorithm results. In the underwater environment Complicated, with large speed changes and unknown conditions, it is easy to generate large errors, which greatly reduces the accuracy of target positioning

Method used

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  • Underwater direct-of-arrival estimation method and device based on two-dimensional orthogonal non-uniform linear array
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  • Underwater direct-of-arrival estimation method and device based on two-dimensional orthogonal non-uniform linear array

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Embodiment 1

[0118] An underwater DOA estimation method based on a two-dimensional orthogonal non-uniform linear array. The principle of this method is to firstly perform phase compensation on the steering matrix of the non-uniform linear array to obtain the corresponding uniform linear array guidance matrix, and then use the ESPRIT algorithm to perform DOA estimation iterations on the steering matrix of the uniform linear array to obtain the rotation operator on the uniform linear array corresponding to the two non-uniform linear arrays, and then use the sound wave reflected from the target in the non-uniform regular The relationship between the direction angles formed on the intersecting linear array, the expression of the direction of arrival angle containing two rotation operators and without the speed of sound is derived, and finally the values ​​of the two rotation operators are substituted into the expression to obtain the final The size of the orientation angle.

[0119] The specif...

Embodiment 2

[0209] An underwater direction of arrival estimation device based on non-uniform orthogonal linear array such as figure 1 As shown, it includes a control module, a processing module, an AD conversion module, a transmitting module, a receiving module, an output module and a power supply module.

[0210] The control module is composed of a PC, and is connected with the processing module and the power supply module, and is mainly used to control the processing module to send different signals. It can select different transmission signal center frequency, pulse length and other parameters according to different application scenarios, and transmit these parameters to the processing module.

[0211]The processing module is composed of a digital signal processor, and is connected with a control module, an AD conversion module, an output module and a power supply module. It can generate a specific digital signal according to the command input by the control module, the digital signal...

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Abstract

The invention discloses an underwater direct-of-arrival estimation method and device based on a two-dimensional orthogonal non-uniform linear array. According to the method, phase compensation is carried out on a guide matrix of a non-uniform linear array to obtain a guide matrix of a uniform linear array corresponding to the non-uniform linear array; on the basis of an ESPRIT algorithm, DOA estimation iteration is carried out on the guide matrix of the uniform linear array to obtain rotation operators on uniform linear arrays corresponding to two non-uniform linear arrays; on the basis of a relationship between direction angles formed by acoustic waves reflected by a target on a non-uniform orthogonal linear array, an expression of a direct-of-arrival angle including the two rotation operators not including an acoustic speed is deduced; and then values of the two rotation operators are substituted into the expression to calculate the value of a final direction angle. According to theinvention, the propagation speed of the signal in the medium is eliminated during the calculation process, so that the influence on the algorithm result by the speed is eliminated. Measurement in a complicated underwater sound environment is realized; the practicability is improved; and the accuracy of the target positioning is high.

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 a two-dimensional orthogonal non-uniform linear array. Background technique [0002] Direction of Arrival (abbreviation: DOA) estimation of space signals is the key point in the research of array signal processing. Array signal processing is a technology that places an array of multiple sensors at different positions in space, uses the array to receive and process space signals, suppresses useless interference and noise, and extracts useful signal features or information; DOA estimation is A method that utilizes this technique to estimate the angle of incidence of a signal. 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. [0003] The existing underwater DOA estima...

Claims

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Application Information

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IPC IPC(8): G01S3/82
CPCG01S3/82
Inventor 宁更新王波文张军冯义志季飞
Owner SOUTH CHINA UNIV OF TECH
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