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Uniform circular array super-resolution spatial spectrum estimation method

A technology of spatial spectrum estimation and super-resolution, which is applied in the field of azimuth super-resolution estimation of uniform circular arrays, and can solve the problems of mapping errors and biased spatial spectrum estimation results.

Active Publication Date: 2019-04-16
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, these algorithms introduce mapping errors or truncation errors, so the obtained spatial spectrum estimation results are biased.

Method used

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  • Uniform circular array super-resolution spatial spectrum estimation method
  • Uniform circular array super-resolution spatial spectrum estimation method
  • Uniform circular array super-resolution spatial spectrum estimation method

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specific Embodiment

[0084] N signals are incident on M=11-element uniform circular array, and the signal-to-noise ratio is equal; the radius of the uniform circular array is r=2.5λ, the number of samples is K=1000, and L=3600 is set.

[0085] (1) Construct a virtual reference array:

[0086] M=11 array elements uniform circular array, radius r=2.5λ, λ is the working wavelength of the signal, that is, the actual distance between two adjacent array elements is about 1.4 times the wavelength, the actual array is a sparse circular array, and the position of the actual array antenna elements The matrix is:

[0087]

[0088] remember x max =r,x min = rcos(10π / 11), y max = rsin(6π / 11), y min =rcos(16π / 11), so the position of the rightmost element of the x-axis reference uniform array is (x max ,0), the position of the leftmost array element is (x min ,0); the y-axis refers to the position of the uppermost element of the uniform array (0,y max ); the position of the lowest array element (0,y m...

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Abstract

The invention relates to a uniform circular array azimuth super-resolution estimation method, which belongs to the technical field of spatial spectrum estimation. Target signals firstly have shift-invariant property in targeting; a method of using rotation invariance to estimate signal parameters is then used to acquire multiple parameters carrying target position information; and finally, a new spatial spectrum is defined by using the parameters, and the target azimuth estimation is acquired through searching the position of a spectral peak. The uniform circular array-based super-resolution spatial spectrum estimation can be acquired, the resolution is better than that in a wildly-used multiple signal classification spatial spectrum estimation method, and the method can be used for positioning and estimation of multiple adjacent signals in space.

Description

technical field [0001] The invention belongs to the technical field of spatial spectrum estimation, and relates to a uniform circular array azimuth super-resolution estimation method. Background technique [0002] Spatial Spectrum (SS, Spatial Spectrum) estimation of signals, also known as Direction-of-Arrival (DoA, Direction-of-Arrival) estimation, has extensive and important applications in radar, sonar, communication, sensor networks, etc. Using phased arrays to locate, identify and track space objects is an important part of the research field of super-resolution spatial spectrum estimation. [0003] The array technology of the antenna elements of the phased array has a direct impact on the performance of the spatial spectrum estimation, so the antenna array technology is also very important. The most researched is the uniform array, including uniform linear array (ULA, Uniform Linear Array), uniform rectangular array (URA, Uniform Rectangle Array) and so on. A uniform...

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Application Information

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IPC IPC(8): G01S3/00
CPCG01S3/00
Inventor 刘松庞育才翁明江余翔
Owner CHONGQING UNIV OF POSTS & TELECOMM
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