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A Design Method of Sparse Concentric Circular Array Based on Bessel Function

A technology of concentric rings and ring arrays, which is applied in the fields of radar, radio astronomy and satellite communications, can solve the problems of sparsely distributed concentric ring arrays and large numbers of array elements, and reduce the amount of calculation and peak sidelobe voltage. flat effect

Active Publication Date: 2019-02-26
NAT SPACE SCI CENT CAS
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  • Abstract
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Problems solved by technology

[0004] At present, there are relatively few studies on sparsely distributed concentric circular arrays, and in order to ensure the generation of circular symmetric patterns, the existing research methods are mainly divided into two categories: one is the uniform interval d=0.5λ between adjacent elements on the confinement ring , then the radius is r m The number of elements N on the circle of m =floor(2πr m / d) (the number of array elements can only be an integer, and the function floor(x) means rounding down), so only the radius of the ring is optimized to synthesize the sparse concentric ring array with a circular symmetric pattern (reference [3 ]: R.L.Haupt, "Optimized Element Spacing for Low Sidelobe Concentric Ring Arrays," IEEE Trans. Antennas Propagat., vol.56, no.1, pp.266-268, Jan.2008, reference [6]: Y. Jiang , and S. Zhang, "An Innovative Strategy for Synthesis of Uniformly Weighted Circular Aperture Antenna Array Based on the Weighting Density Method" IEEE, Antennas Wireless Propa. Lett., vol.12, pp.725-728, 2013), this type of method The main disadvantage is that the interval constraint of adjacent elements is 0.5λ, which leads to more array elements required by the array; the second is to use the correlation algorithm to calculate the radius of the concentric ring and the excitation amplitude of the equivalent continuous current ring, and then use the uniform The spaced equal-amplitude array elements discretize the continuous current loop, so that the number of array elements uniformly arranged on each ring can be determined (reference [5]: O.M.Bucci and D.Pinchera, "A Generalized Hybrid Approach for the Synthesis of UniformAmplitude Pencil Beam Ring-Arrays,"IEEE Trans.Antennas Propagat.,vol.60,pp.174-183,2012, reference [7]: M.Carlin,G.Oliveri,and A.Massa,"Hybrid BCS-Deterministic Approach for Sparse Concentric Ring Isophoric Arrays,"IEEE Trans.Antennas Propagat.,vol.63,no.1,pp.378-383,Jan.2015, reference [8]: X.Zhao,Q.Yang and Y.Zhang , "A Hybrid Method for the Optimal Synthesis of 3-D Patterns of Sparse Conc entric Ring Arrays,"IEEE Trans.Antennas Propagat.,vol.64,no.2,pp.515-524,Feb.2016.)
The above method can realize the simultaneous optimization of the radius of the ring and the number of uniformly distributed array elements on the ring, but the total number of array elements needs to be given in advance, and only by selecting a reasonable total number of array elements can the sparse array that meets the requirements of the pattern be synthesized. Concentric ring array, therefore, these methods need to go through multiple experiments to find a reasonable total number of array elements, and then to determine the distribution of array elements on the corresponding ring

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  • A Design Method of Sparse Concentric Circular Array Based on Bessel Function
  • A Design Method of Sparse Concentric Circular Array Based on Bessel Function
  • A Design Method of Sparse Concentric Circular Array Based on Bessel Function

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example 1

[0106] The sparse concentric ring array of Example 1 has a front radius R=5λ, and the number of concentric rings M=7. The method of the present invention is used to optimize the design of the ring radius of the sparsely distributed concentric ring array and the number of uniformly distributed array elements on the ring. The simulation results show that the calculation time required by the present invention is 20s, and the radius of each concentric ring is r m Instead of uniformly distributing the number of array elements Nm, see Table 1, the array element layout is as follows image 3 As shown, the total number of array elements of the array is 175, which has good circular symmetry characteristics, and achieves 360° azimuth without change coverage. The azimuth tangent direction map is as follows Figure 5 As shown, and the peak sidelobe level of the pattern is -27.1dB. The number of array elements required for a uniform array within the same array aperture is 341, and the corresp...

example 2

[0110] Example 2 is a sparsely distributed concentric circular ring array with a radius of R=25λ on the surface of a circular opening with a number of M=26, which aims to verify the superiority of the method of the present invention in comprehensive large-diameter arrays. The simulation results show that a 26-ring sparsely distributed concentric circular ring array composed of 2042 array elements achieves a peak sidelobe level of ─32.9dB on a circular opening with a radius of 25λ. Figure 5 The array element layout of the array is given, Image 6 It is a cross-sectional diagram of each direction. As a comparison, the total number of elements required for a uniform full array of the same caliber is as high as 7,987, but the achieved peak sidelobe level is only -17.5dB. In this case, the method of the present invention only uses 25.6% of the number of array elements can be achieved under the condition of ensuring the circular symmetry of the pattern-a low sidelobe of 32.9dB, whic...

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Abstract

The invention provides a Bessel function based sparse concentric ring array design method. The method includes: taking a ring radius of a sparse concentric ring array as an optimized parameter, and generating a plurality of weed individuals randomly to form an initial group; as for every weed individual, determining a minimum number of array elements on a ring according to the ring radius so as to determine peak sidelobe level of the sparse concentric ring array as a weed individual adaptation value; generating a seed for every weed individual; combining filial individuals formed by optimized variable ring radiuses with parent individuals together to form new groups, sequencing all the individuals in the group according to an increasing sequence of the adaption values, only keeping a specific number of individuals as an initial group for next evolution and weeding out the rest individuals; repeating the process until stopping criterion for iteration is satisfied, and outputting an optimal individual in the ultimate group.

Description

Technical field [0001] The invention relates to the fields of radar, radio astronomy and satellite communication, and in particular to a design method of a sparse concentric circular ring array based on Bessel functions. Background technique [0002] Concentric circular arrays are widely used in radar, radio astronomy, and satellite communications due to their azimuth-free coverage and 360° azimuth scanning capabilities (Reference [1]: OMBucci, S. Perna, and D. Pinchera ,"Synthesis of Isophoric Sparse Arrays Allowing Zoomable Beams and ArbitraryCoverage in Satellite Communications,"IEEE Trans.Antennas Propagat,vol.63,pp.1445-1457,2015) and other fields. The uniform concentric ring array means that without excitation weighting, the array elements on the concentric rings are evenly distributed, and the concentric rings are also evenly distributed along the radial direction. Although the uniform concentric ring array is simple in structure, its pattern has high directivity coeffici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 赵晓雯张云华杨青山
Owner NAT SPACE SCI CENT CAS
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