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针对简单遗传算法(Simple Genetic Algorithm,SGA)的不足,提出多种群首领决策遗传算法(Multi-Population Leader Dominating Genetic Algorithm,MPLDGA).通过将普通个体和首领进行交叉、多种群进化等策略,使得MPLDGA具有收敛速度快、全局搜索能力强、消耗时间短等优点.利用该算法,首先优化设计了18元线阵的激励系数,实现了覆盖-5°~25°的余割平方方向图,副瓣电平优于-30 dB.最后,优化设计了具有401个单元的平面稀疏阵列,实现了在稀疏率为60.8%时副瓣电平优于-21.9 dB. 相似文献
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圆柱面上的轴向偶极子阵的低副瓣方向图优化综合 总被引:1,自引:1,他引:0
本文利用新的非线性最优化方法讨论圆柱面上的轴向偶极子阵的低副瓣方向图优化综合问题,利用阵列的单元可实现增益方向图,我们把阵列综合问题表述为一个约束非线性规划问题,采用新直接法求解该问题即可得出一组使阵列的总方向图满足副瓣指标要求,同时具有尽可能高的方向性系数的激励系数,如果阵列的总方向图不能达到副瓣指标,则可得出一组使阵列方向图在可达到的副瓣方向图综合设计的模拟计算结果。 相似文献
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建立了一种通用的适应度函数式,通过遗传算法对八元阵优化,逼近二项式分布和切比雪夫分布,验证了算法的正确性。通过对八元阵方向图不同目标的优化,说明该算法及适应度函数的设计对任意布阵天线方向图多目标优化的有效性。 相似文献
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Improve the performance of a linear array by changing the spaces among array elements in terms of genetic algorithm 总被引:1,自引:0,他引:1
Yu-Bo Tian Jian Qian 《Antennas and Propagation, IEEE Transactions on》2005,53(7):2226-2230
The pattern of linear array is optimized via adjusting the current allocations and positions of elements simultaneously in terms of improved genetic algorithm (GA). Optimized results show that minute modification of the element positions can improve the array pattern, especially for the fewer elements case. It is found that the improvements are attributed to additional side lobes, which involved some radiation energy and resulted in reduction of relative side lobe level (RSLL). In the optimal process, some skills, such as the soft constraints linked to the fitness function, the adaptive searching area, the injection of simulated annealing and immune operator etc., are used to make the algorithm more effective. 相似文献
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Thors B. Steyskal H. Holter H. 《Antennas and Propagation, IEEE Transactions on》2005,53(10):3280-3287
In this paper, a synthesis procedure to design thin broad-band fragmented aperture array elements is described. The arrays are assumed to be infinite periodic and the elements consist of a conducting pattern etched on a dielectric backed by a groundplane. A genetic algorithm (GA) is used to design the conducting pattern, relative permittivity, and thickness of the dielectric substrate with respect to array scan and bandwidth performance. The fitness function in the GA is evaluated using a finite-difference time-domain code with periodic boundary conditions. For a substrate thicker than about 0.1 /spl lambda//sub L/ (/spl lambda//sub L/= wavelength at the lowest frequency in the frequency band investigated), it was found that a bandwidth of at least one octave can be obtained for arrays scanned within 45/spl deg/ from broadside. 相似文献
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