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Orthogonal uniform linear array-based underwater direction-of-arrival (DOA) estimation method and system

A technology of direction of arrival estimation and uniform linear array, which is used in systems for determining direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, etc., which can solve the problems of not considering speed and reducing target positioning accuracy.

Active Publication Date: 2016-05-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ESPRIT algorithm 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. When the speed changes greatly and is uncertain, it is easy to generate a large error, which greatly reduces the accuracy of target positioning. Accuracy

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  • Orthogonal uniform linear array-based underwater direction-of-arrival (DOA) estimation method and system
  • Orthogonal uniform linear array-based underwater direction-of-arrival (DOA) estimation method and system
  • Orthogonal uniform linear array-based underwater direction-of-arrival (DOA) estimation method and system

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Embodiment 1

[0122] This embodiment provides an underwater DOA estimation method based on an orthogonal uniform linear array. For the flow chart of the estimation method, refer to the attached Figure 4 As shown, the following specific steps are included:

[0123] Step S1, establishing a scene model of an orthogonal uniform line array;

[0124] Two orthogonal uniform linear arrays are placed in the water, and the model scene is as follows figure 2 shown. Each uniform line array has M receiving array elements, and the distance between the array elements is d, and the K narrowband target sound sources are respectively S 1 ,S 2 ,...,S K , the center frequency is f, and the direction angles of these target sound sources corresponding to the horizontal line array are θ x1 ,θ x2 ,…,θ xK , and the direction angles corresponding to the vertical line array are θ y1 ,θ y2 ,…,θ yK .

[0125] Step S2, deriving the received signal model of the horizontal uniform line array;

[0126] The mo...

Embodiment 2

[0212] The underwater DOA estimation system based on the orthogonal uniform linear array provided in this embodiment has a hardware structure module composition as follows figure 1 As shown, it includes a data acquisition processing and control module, a transmitting module, a receiving module, an output module and a power supply module.

[0213] The data acquisition processing and control module is composed of a processor, a D / A converter and an A / D converter, and is connected with a transmitting module, a receiving module, an output module and a power supply module. It can control the transmitting module by setting parameters, so that the transmitting module can transmit the designated sound wave signal; it can also collect and process the data sent back by the receiving module, and use the algorithm of the invention to calculate the precise direction of arrival angle. In addition, it can also transfer the processed data to the output module, so that they can be output to ex...

Embodiment 3

[0220] The underwater DOA estimation system based on an orthogonal uniform linear array provided in this embodiment includes a data acquisition processing and control module, a transmitting module, a receiving module, an output module and a power supply module. The data acquisition processing and control module is realized by DSP chip (such as: TI's TMS320VC5509A DSP chip), this DSP chip can realize the functions of A / D conversion and D / A conversion, and can realize the rotation operator of uniform linear array and the calculation of the final direction of arrival; the transmitting module uses an ultrasonic transmitting probe; the receiving module uses two orthogonal uniform linear arrays, each of which includes multiple ultrasonic receiving probes, and the number is the same; the output module uses a USB interface and An LCD display. figure 1 It is the block diagram of the hardware structure of the device described in this embodiment.

[0221] Main working steps of the prese...

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Abstract

The invention discloses an orthogonal uniform linear array-based underwater direction-of-arrival (DOA) estimation method and system. The estimation system comprises a data acquiring, processing and controlling module, an emitting module, a receiving module, an outputting module and a power module. In the receiving module, ultrasonic receiving probe arrays are orthogonal uniform linear arrays. Each array comprises the same number of ultrasonic receiving probes. The invention realizes accurate target positioning when the propagation speed of the sound wave under water is uncertain, improves the ESPRIT algorithm, eliminates the sound speed in the algorithm and makes the final estimation result independent of the sound speed. In this way, the effect of uncertain sound speed on DOA is eliminated, achieving relatively high practicability. In addition, it is possible to carry out measurement in different underwater acoustic environments, and underwater target positioning is relatively accurate.

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 system based on an orthogonal uniform linear array. Background technique [0002] Direction of Arrival (abbreviation: DOA) estimation of space signals is an important problem in the study of array signal processing. The so-called array signal processing refers to placing multiple sensors at different positions in space to form an array, and using the array to receive and process space signals, the purpose is to suppress useless interference and noise, and extract useful signal features or information. DOA estimation uses this processing method to estimate the incident angle of the signal. [0003] The existing DOA estimation methods mainly include beamforming method, high resolution spectrum estimation method, subspace fitting algorithm and subspace decomposition algorithm. First, the beamforming method extends...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 宁更新王波文周长库宁秋燕张军冯义志季飞
Owner SOUTH CHINA UNIV OF TECH
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