Combined optimization method applied to irregularly-arranged sub-array four-dimensional antenna array

Abstract

The invention discloses a combined optimization method algorithm to an irregularly-arranged sub-array four-dimensional antenna array. The definition of information entropy is introduced into a four-dimensional array, the originally-complicated optimization problem is divided into two sub-problems, optimization is performed according to two steps, in the first step, an information entropy-based genetic algorithm is employed, the array topology structure with maximum information entropy value is optimized according to a sub-array arrangement algorithm, in the second step, information such as a static excitation phase of each sub-array of the sub-arrays, the closing continuous time of a switch and the initial closing time of the switch is optimized by a differential evolutionary algorithm according to the requirement of low sideband and low side lobe, so that the whole optimization problem can be more efficiently solved. The maximum innovation lies in that the intrinsic characteristic ofthe original optimization problem is dug, optimization is performed by combining the information entropy-based generic algorithm and the differential evolutionary algorithm, the complexity of the original optimization problem is reduced, T / R modules are saved by half, and meanwhile, the characteristics of low sideband and low side lobe under large-angle scanning are ensured.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to the synthesis of four-dimensional antenna arrays based on irregular sub-arrays. Specifically, a joint optimization method is used to efficiently synthesize four-dimensional antenna arrays. This joint algorithm mainly uses the principle of information entropy, and divides the synthesis of four-dimensional antenna array into two steps. First, the topology of the irregular array is optimized by genetic algorithm, and then the target pattern is synthesized as needed. Background technique [0002] Phased array antennas are widely used in the radar and communication fields because they can achieve the purpose of beam scanning by changing the phase. At the same time, the amplitude and phase weighting methods of conventional phased arrays are difficult to meet the requirements of low sidelobes of antenna arrays, which limits the application range of antennas. [0003] The concept of the ...

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Problems solved by technology

Although a periodic array with a large unit spacing can solve the above-mentioned arrangement and processing problems, due to the increase of the unit spacing, the sidelobe level of the array increases, and even grating lobes appear, limiting the array to scan only a small angle

[0005] Considering the basic principle of the antenna array, the periodicity of the array arrangement is the main cause of the grating lobes of the pattern, so how to break the periodicity of the array becomes the main idea of ​​suppressing the grating lobes. R.J.Mailloux, Andrea Massa et al proposed They used the method of irregular sub-array to break the periodicity of the array, but because the optimization problem is too complicated, their scheme can only realize one-dimensional scanning, which is poor in engineering applicability

The patent No. CN 107230843 A adopts a similar scheme to realize two-dimensional scanning, but the scanning performance is not strong. The sub-arrays composed of two units are arranged at 0.7 wavelength intervals under the 20×20 array. Only two-dimensional scanning of ±20° can be realized. This solution has not fully utilized the scanning advantages of irregular sub-arrays, and its applicability in engineering is poor.

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