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Estimation algorithm for two-dimensional direction of arrival (DOA) of L-shaped array by adopting time-frequency analysis

A technology of time-frequency analysis and direction estimation, applied to direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems such as the lack of a two-dimensional DOA estimation algorithm and poor results

Inactive Publication Date: 2017-05-31
WUHAN UNIV
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Problems solved by technology

Although domestic and foreign scholars have deepened the research on two-dimensional DOA estimation, the performance of all aspects has been greatly improved, but so far, no effective two-dimensional DOA estimation algorithm for this type of information source has been proposed.
Furthermore, most of the existing 2D DOA estimation algorithms do not work well with low SNR and underdetermined

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  • Estimation algorithm for two-dimensional direction of arrival (DOA) of L-shaped array by adopting time-frequency analysis
  • Estimation algorithm for two-dimensional direction of arrival (DOA) of L-shaped array by adopting time-frequency analysis
  • Estimation algorithm for two-dimensional direction of arrival (DOA) of L-shaped array by adopting time-frequency analysis

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[0058] The technical solutions and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0059] refer to figure 1 , the implementation steps of the present invention are as follows:

[0060] Step 1: Use two uniform linear arrays to form an L-shaped array on the xz plane.

[0061] In the x and z directions, array elements are placed at the same interval d, and there are M array elements in each direction, and the original array element is specified in the z direction. Two uniform linear arrays are arranged orthogonally to form an L-shaped array on the xz plane. Suppose there are K frequencies aliasing far-field signals (N represents the number of snapshot samples) by azimuth angle θ k and elevation angle φ k It is incident on this array, and the signal is added with complex Gaussian white noise with a mean value of 0 during the propagation process;

[0062] Step 2: Sampling the uniform linear array recei...

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Abstract

The invention discloses an estimation algorithm for two-dimensional direction of arrival (DOA) of an L-shaped array by adopting time-frequency analysis. The estimation algorithm disclosed by the invention mainly aims at solving the problem of two-dimensional DOA estimation of time-frequency spectrum aliasing and spatial neighborhood information sources and is suitable for low signal to noise ratio and underdetermined conditions. The estimation algorithm is realized by the following steps: firstly, forming the L-shaped array on an xz plane by using two uniform linear arrays to construct total receiving data; secondly, transforming the total receiving data into a time-frequency domain by adopting STFT (Short Time Fourier Transform); thirdly, selecting single information source time-frequency points of all the information sources in a two-dimensional direction, and establishing a time-frequency receiving data matrix of single information sources; fourthly, constructing a time-frequency cross correlation matrix; fifthly, calculating a novel receiving matrix subjected to aperture expansion; sixthly, based on a propagation operator principle, defining a propagation operator subjected to the aperture expansion; seventhly, constructing an angle selection matrix, and calculating the two-dimensional DOA according to rotational invariance among sub-matrixes. According to the estimation algorithm disclosed by the invention, estimation precision of the time-frequency spectrum aliasing and spatial neighborhood information sources and the success rate are improved, high robustness of noises is realized, and required number of array elements can be reduced.

Description

technical field [0001] The invention belongs to the field of array signal processing, in particular to a two-dimensional direction-of-arrival estimation simulation method based on time-frequency analysis, which can solve time-frequency aliasing and azimuth estimation of spatially adjacent information sources. Background technique [0002] Two-dimensional direction of arrival (DOA) estimation is very important in the field of array signal processing. It estimates the orientation information of multiple incoming signals, such as azimuth and elevation angle, by processing the received data on array elements arranged in a certain way in space. . Two-dimensional DOA estimation technology can be applied to wireless communication, radar, sonar positioning and other applications, and has been widely studied by domestic and foreign scholars. During the research process, many array models have been developed, such as uniform rectangular array, double-parallel uniform linear array, un...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 张海剑郑玲
Owner WUHAN UNIV
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