Rapid direction finding method suitable for non-uniform array
A non-uniform and array technology, applied in the field of fast direction finding, can solve the problems of unfavorable real-time implementation and increased calculation amount, and achieve the effect of easy engineering implementation and high direction finding accuracy
Active Publication Date: 2022-05-27
南京宇安防务科技有限公司 +1
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[0036] To sum up, for the non-uniform array, the traditional beamforming algorithm cannot simply use FFT to achieve fast calculation due to the unequal spacing of the array elements in the existing technical solutions. When the number of array elements is large, the calculation The amount increases, which is not conducive to real-time implementation
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[0075] The technical solutions of the present invention are described in detail below, but the protection scope of the present invention is not limited to the embodiments.
[0076] like figure 1 As shown, the fast direction finding method suitable for non-uniform arrays in this embodiment, the non-uniform array elements include N array element { }, the incoming wave direction is , for the first elements from the leftmost reference element E 0 The distance in the shortest half-wavelength of , is the shortest wavelength of the non-uniform array; ; The received signal of each array element in the non-uniform array is expressed as:
[0077] ;
[0078] ;
[0079] In the above formula, is a positive integer, is the phase function of the received signal, for the first The received signal components output by the array elements, is the noise component; and , , is the wavelength of the current incoming wave; and respectively the signal The real ...
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The invention discloses a fast direction finding method suitable for a non-uniform array, which comprises the following steps of: determining the length of a discrete space sequence according to array parameters, constructing and initializing the discrete space sequence, and selecting to use discrete Fourier transform (DFT) or fast Fourier transform (FFT) calculation according to the number of array elements and the sequence length. And reading the wavelength of the received incoming wave and a receiving channel, updating the discrete space sequence, carrying out DFT or FFT operation on the discrete space sequence to obtain an angle corresponding to the maximum value of the real part directional diagram, and then carrying out iterative solution and calculating the direction of the incoming wave. According to the method, the array element output signal sequence is properly processed, so that the approximate position of the peak value of the directional diagram can be quickly obtained by using the FFT. Based on the approximate position, the accurate position of the peak value of the directional diagram can be obtained by utilizing an iterative algorithm, and then accurate direction finding is realized.
Description
technical field [0001] The invention belongs to the wave-of-arrival direction finding technology, in particular to a fast direction finding method suitable for non-uniform arrays. Background technique [0002] Direction of arrival (DOA) estimation is a technique for obtaining the direction of arrival by processing the spatial incoming wave signals received by the antenna array distributed in different positions. It is one of the important contents of array signal processing research. , radar, communications, sonar and other fields have been widely used. [0003] According to the characteristics of array element spacing, antenna arrays can be divided into uniform arrays with equal spacing and non-uniform arrays with unequal spacings. A uniform array requires that the element spacing cannot be greater than half the wavelength of the incoming wave. The non-uniform array breaks through this limitation and can obtain a larger effective aperture with fewer array elements, and ha...
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IPC IPC(8): G01S3/14
CPCG01S3/14Y02D30/70
Inventor 于明成李继锋李晃朱文明
Owner 南京宇安防务科技有限公司