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A High Precision Direction Finding Method for Linear Array

A linear array, rough measurement technology, applied in direction finders, radio wave measurement systems, measurement devices using ultrasonic/sonic/infrasonic waves, etc. problem, to achieve the effect of high robustness, fast calculation speed, and easy DSP engineering implementation.

Inactive Publication Date: 2011-12-28
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
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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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  • A High Precision Direction Finding Method for Linear Array
  • A High Precision Direction Finding Method for Linear Array
  • A High Precision Direction Finding Method 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-finding method for a linear array, which includes: performing traditional beamforming in the frequency domain on the space-time two-dimensional signal received by the linear array, and scanning in the beam domain to obtain a roughly measured target angle; The linear array is divided into several sub-arrays, and within the range of the roughly measured target angle, traditional beamforming in the frequency domain is performed on the space-time two-dimensional signals received by each sub-array and focused to form frequency domain-wavenumber data; - The wavenumber data is processed within the roughly measured target angle range according to the broadband focusing minimum variance distortion-free method to obtain the target signal azimuth. By applying the invention, the calculation speed is fast, real-time processing can be realized, the algorithm has high robustness, and the target detection precision is high.

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...

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Application Information

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Patent Type & Authority Patents(China)
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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