Three-level extension transformation nested array design method for non-circular signal direction-of-arrival estimation
A technology for extending transformation and design methods, applied to direction finders using radio waves, radio wave direction/deviation determination systems, design optimization/simulation, etc., to achieve the effects of increasing the number of detections, improving estimation accuracy, and reducing redundancy
Inactive Publication Date: 2020-12-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, there is still a lot of room for improvement in the degree of freedom of these sparse array structures proposed so far.
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[0028] The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0029] Take incident signal frequency 20GHz, array element total number N=16 as example, to the three-stage extended transformation nested array of the present invention (such as figure 1 shown) build is described in detail.
[0030] (1) Calculate the incident signal wavelength λ=c / f=3.0×10 8 / 20×10 9 =1.5cm; use d to represent the basic unit of array element spacing, and take it as half wavelength, that is, d=λ / 2=7.5mm;
[0031] (2) According to the total number of elements N=16 given by the array, select a group of N 1 and N 2 , satisfying N=N 1 +N 2 , where N 1 ≥13,N 2 ≥1; in this case N was selected 1 =13,N 2 = 3;
[0032] (3) According to the selected N 1 and N 2 Constructs a transformation nested matrix; in this case, the transformation nested matrix consists of sparse subarrays and dense array composition;
[0033...
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The invention discloses a three-level extension transformation nested array design method for non-circular signal direction-of-arrival estimation. According to the method, the positions of two sub-arrays of a traditional nested array are exchanged firstly, so that sparse sub-arrays are in front of dense sub-arrays; Then, by implementing sparse layout on the dense sub-arrays, the virtual sum-difference array has a large-range continuous section, so that the degree of freedom is improved, the implementation steps comprise steps of calculating array element spacing basic units, determining the number of array elements and array element spacing parameters, and determining the physical positions of the array elements according to an analytic expression. Under the condition of the same array element number, the degree of freedom of the virtual sum-difference array can be effectively increased, the estimation precision of the direction of arrival is improved, the space target detection capability is improved, and the array operation cost is reduced.
Description
technical field [0001] The invention belongs to the field of array signal processing, and relates to a sparse array optimization layout and design method suitable for non-circular signal direction of arrival estimation, specifically an array aperture expansion structure based on nested arrays, which can be used to generate high degrees of freedom The virtual sum and difference array of . Background technique [0002] Direction of arrival estimation is an important topic in the field of array signal processing, and plays an important role in applications such as radar, sonar, wireless communication, and navigation. The traditional direction of arrival estimation uses a uniformly arranged sensor array, and the sensor interval is less than half a wavelength. This uniform arrangement ensures that the spatial spectrum form of the signal is unique, the spatial information has no aliasing, and the spatial detection target can be uniquely identified through the spectral function. ...
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IPC IPC(8): G06F30/20G01S3/14
CPCG01S3/14G06F30/20
Inventor 王卫江任仕伟王晓华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY