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High-precision direction finding method used for linear array

A line array, rough measurement technology, applied in direction finders using ultrasonic/sonic/infrasonic waves, radio wave measurement systems, measurement devices, etc., can solve problems such as poor practicability, low robustness, and difficulty in processing broadband target signals, etc. problem, to achieve the effect of high robustness, high target detection accuracy, and easy implementation of DSP engineering

Inactive Publication Date: 2009-07-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0010] In order to overcome the defects of poor practicability, low robustness and difficulty in processing broadband target signals in the existing high-precision lateral technology, the present invention provides a high-precision direction-finding method for linear arrays

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  • High-precision direction finding method used for linear array
  • High-precision direction finding method used for linear array
  • High-precision direction finding method used for linear array

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Embodiment Construction

[0042] A high-precision direction finding method for a linear array provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] figure 1 shows conventional line arrays in the prior art, such as figure 1 As shown, the line array 102 used to receive space signals is composed of 32 conventional non-directional hydrophones 101, the center frequency of the received signal of the hydrophones 101 is 5000KHz, and the distance between any two hydrophones is half an inch. Wavelength, the total length of the acoustic vibration section of the line array 012 is 4.65 meters, and the line array 102 can be installed on a submarine or an unmanned underwater vehicle.

[0044] In the method provided according to the embodiments of the present invention, such as figure 2 As shown, by utilizing the high efficiency of fast Fourier transform calculation, fast conventional beamforming is realized in the freque...

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Abstract

The invention discloses a high precision direction measurement method for linear arrays, comprising: forming frequency domain traditional wave beam for the two-dimensional space-time signals received by a linear array; scanning in the wave beam domain to obtain a target angle measured roughly; dividing the linear array into a plurality of sub arrays; in the target angle range measured roughly, processing frequency domain traditional wave beam formation and focusing on the space-time two dimension signals received by each sub array to form frequency domain-wave number data; in the target angle range measured roughly, processing the frequency domain-wave number data according to a wideband focusing minimum variance distortion-less method, to obtain the direction of target signal. The invention has high calculation speed, can realize real-time processing, has high algorithm robustness, and has high target detection precision.

Description

technical field [0001] The invention relates to the technical field of sonar signal processing, and more particularly, the invention relates to a high-precision direction finding method for a linear array. Background technique [0002] A fundamental problem in sonar signal processing is direction finding, to determine the direction of a spatial signal of interest. High-precision direction-finding technology refers to the use of a certain algorithm to process the two-dimensional space-time signal radiated or reflected by the target array, so as to obtain a high-precision estimate of the target orientation. High precision direction finding technology has been widely used in sonar, radar and other fields. [0003] The current typical high-precision direction-finding algorithms for linear arrays include: "J.Capon, High-Resolution Frequency-Wavenumber Spectrum Analysis, Proceedings of the IEEE, Vol.57, No.8, August 1969" in the Capon method , "Sun Changyu et al., Two-dimensiona...

Claims

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Application Information

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IPC IPC(8): G01S3/80G01S7/52G01S15/00G06F17/16
Inventor 田彪叶青华黄海宁李宇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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