Irregular subarray arrangement optimization method capable of ensuring ultra-large scanning angle

Abstract

The invention discloses a phased array arrangement optimization method based on irregular subarrays. According to the method, the definition of array information entropy is fully utilized, and the array information entropy is applied to an irregular phased array based on a four-network grid form; and an optimization model is linearized by adding variables, so that an original problem can be solvedby a commercial solve; after array arrangement is optimized, a directional diagram of a required scanning angle is synthesized through a convex optimization algorithm. The method is most ingenious inthat the essential characteristics of the original optimization problem are mined; the convex optimization algorithm is adopted for optimization; and therefore, calculation time is greatly saved, anda super-large-angle scanning characteristic is guaranteed while only one fourth of the number of T / R components of an original array is used.

Description

technical field [0001] The invention belongs to the field of antenna technology and relates to an optimization method for irregular sub-array arrangement. This algorithm mainly adopts the principle of information entropy, transforms the optimization model into a mixed integer linear programming, and can efficiently optimize the irregular array through a commercial solver topological structure, and then synthesize the target direction graph as needed. Background technique [0002] Phased array antennas are widely used in radar and communication fields because they can achieve the purpose of beam scanning by changing the phase, but at the same time, because each unit needs to be connected with a phase shifter and T / R components, the 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] In the 1960s and 1970s, f...

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Problems solved by technology

However, for the array calculated by the optimization algorithm, the position of the array elements is generally very irregular, and the processing and arrangement of the array elements are very difficult problems. At the same time, the sparseness of the array will significantly change the coupling between the array elements, which will seriously affect the radiation performance of the entire array.

[0004] Considering the basic principle of the antenna array, the periodicity of the array arrangement is the main reason for 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, AndreaMassa and others proposed The irregular sub-array method is used 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-array composed of two units is arranged at a 0.7 wavelength interval 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.

The patent No. CN108808266A also adopts the optimization scheme based on the principle of maximum entropy, but when it is applied to a quadruple grid (that is, a sub-array composed of four units), there will be inconsistent scanning capabilities of each surface of the two-dimensional scanning. Simultaneous scanning smaller angle

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