Subarray-level distributed frequency control array side lobe suppression method based on improved genetic algorithm

An improved genetic algorithm and sidelobe suppression technology, applied in radio wave measurement systems, instruments, etc., to avoid premature phenomena, improve optimization results, and speed up convergence.

Pending Publication Date: 2022-04-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

So far, there has been no research on sub-array-level distributed frequency control arrays. For this reason, the present invention proposes for the first time the use of an improved genetic algorithm combined with pre-selection mechan

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  • Subarray-level distributed frequency control array side lobe suppression method based on improved genetic algorithm
  • Subarray-level distributed frequency control array side lobe suppression method based on improved genetic algorithm
  • Subarray-level distributed frequency control array side lobe suppression method based on improved genetic algorithm

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Embodiment 1

[0056] Such as figure 1 As shown, this embodiment provides a technical solution: combining the pre-selection mechanism and the improved genetic algorithm of tabu search to realize the sub-array-level distributed frequency control array sidelobe suppression method, which specifically includes the following steps:

[0057] S1: Set parameters and initialize the population.

[0058] Consider a distributed frequency control array composed of M×N sub-arrays, in which each sub-array is a uniform planar phased array of P×Q, and the array element spacing in the x-axis and y-axis directions of each sub-array is respectively denoted by d x and d y Indicates that they are all half-wavelength, and the adjacent sub-array spacing in the x-axis and y-axis directions is respectively represented by D x and D y express. Set constrained array aperture to L x × L y , all array elements are isotropic and located on the xoy plane in the three-dimensional coordinate system, such as figure 2 s...

Embodiment 2

[0104] In order to evaluate the performance of the present invention, this embodiment verifies the optimization effect of the present invention by comparing simulation experiments under different conditions.

[0105] Due to the angle dimension and distance dimension grating lobe or high sidelobe problem of the subarray-level distributed frequency control array, it is verified that the proposed method can suppress the distance dimension and angle dimension grating lobe or high sidelobe at the same time, and the comparative simulation is carried out from the following three aspects:

[0106] Firstly, the subarray-level distributed frequency control array aperture range L is given x × L y It is 25λ×25λ, and the aperture range is expressed in units of wavelength, which is convenient for the subarray position optimization results to be more intuitive. The number of subarrays is set to M×N=6×6, and the distance between subarrays in each direction is D x =D y =4λ, the distance betw...

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Abstract

The invention relates to a subarray-level distributed frequency control array sidelobe suppression method based on an improved genetic algorithm, and belongs to the field of array antenna signal processing. According to the method, grating lobes or high side lobes of an angle dimension and a distance dimension of a distributed frequency control array are suppressed at the same time by using an improved genetic algorithm; the improved genetic algorithm is a niche genetic algorithm based on a pre-selection mechanism, a competition mechanism is introduced between a parent and a child, only when the fitness value of a child individual is higher than that of the parent individual, the child individual can correspondingly replace the parent individual, otherwise, the parent individual is still reserved in a next-generation group, and the niche genetic algorithm is a niche genetic algorithm. Optimizing local and global optimal solutions in a feasible solution space; and the tabu search is introduced to accelerate the convergence rate, and the premature phenomenon and the stagnation of the genetic algorithm are avoided, so that the local optimal solution is jumped out. According to the method, the optimization result of the subarray position and the subarray frequency offset of the subarray-level distributed frequency control array is improved, and a better sidelobe suppression result is realized from the distance dimension and the angle dimension.

Description

technical field [0001] The invention belongs to the field of array antenna signal processing, and relates to a sub-array level distributed frequency control array sidelobe suppression method based on an improved genetic algorithm. Background technique [0002] The advancement, development and update of radar technology come from the diversification of radar application scenarios and the complexity of realistic functional requirements. Especially for complex battlefield environments and threats from enemy targets, radar systems must have long-distance detection capabilities and precise target positioning capabilities, which indicates that radar antennas need to meet the conditions of their own high gain and large-scale physical array aperture. However, in actual engineering, due to the physical structure limitation of the carrier platform, it is difficult to obtain enough space for the effective installation of large-scale antenna arrays. Therefore, multiple distributed smal...

Claims

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Application Information

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IPC IPC(8): G01S7/02G01S7/28
CPCG01S7/023G01S7/2813
Inventor 景小荣廖凤香
Owner CHONGQING UNIV OF POSTS & TELECOMM
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