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同心圆阵天线具有结构简单、波束旋转对称、旁瓣电平低等特点,但是阵列阵元数较多,系统实现的代价大。文中提出了一种非均匀稀疏同心圆阵的设计方法。基于差集的阵列稀疏优化方法具有解析性,运算量小,旁瓣电平低等优点。首先利用循环差集方法获得阵列初始的稀疏优化结构,并进一步将差集产生的解集作为遗传算法的初始值,通过差集与遗传算法相结合进一步优化阵列结构。仿真结果表明:该方法在保持较大稀疏率的同时获得了较理想的旁瓣电平。
Concentric array antenna has the advantages of simple structure, symmetrical beam rotation, low sidelobe level, etc. However, the array array element number is large, and the cost of system implementation is large. In this paper, a non-uniform sparse concentric circular array design method. The array sparse optimization method based on difference set has the advantages of resolving power, small amount of operation and low sidelobe level. Firstly, the initial sparse optimization structure of the array is obtained by using the cyclic difference method, and the solution set generated by the differential set is further used as the initial value of the genetic algorithm. By combining the difference set with the genetic algorithm, the array structure is further optimized. The simulation results show that this method can obtain a better sidelobe level while maintaining a larger sparse rate.