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针对共形球面天线阵列,采用有向天线阵元,在保持阵列孔径不变的条件下,以阵元分布位置作为优化变量,以降低最大相对旁瓣电平为优化目标,运用改进的遗传算法对阵列进行稀疏优化,仿真结果表明:该方法能够降低球形阵列的旁瓣电平,达到了减少阵元个数、降低天线系统成本的目的。 相似文献
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运用遗传算法优化共形球面天线阵列 总被引:1,自引:0,他引:1
针对共形球面天线阵列,采用遗传算法这一全局优化方法,在保持阵列孔径不变的情况下,以阵元分布位置作为优化参量,以最大相对副瓣电平为优化目标,进行稀疏优化,减少了阵元数量,降低了成本。仿真结果表明,该方法可有效地降低球形阵列的旁瓣电平。 相似文献
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针对二维稀疏超声相控阵声场分布中的栅瓣和旁瓣问题,推导了二维稀疏超声相控阵的指向性公式,并利用发射阵列和接收阵列交错分布的方式消除栅瓣及抑制旁瓣,从而优化声场特性,优化后横向和侧向扫描范围由30°扩大到60°。建立了优化后阵列声场指向性与损坏阵元位置的函数关系式。声场指向性仿真结果表明,距阵列中心越近的阵元损坏时旁瓣升高越多,单个阵元损坏导致一级旁瓣最多升高20dB,主瓣下降约6dB,且与损坏阵元位置无关;相同位置的发射阵列和接收阵列阵元同时损坏时,对声场特性影响达到最大。 相似文献
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In symmetrical thinned linear arrays design, the positions of thinned array elements are very important for optimal performance in terms of its minimum peak side lobe level (Msli). For the synthesis of thinned arrays with a given thinning rate, it would have almost the same Msll solution between taking only segmental aperture nearby both ends of the aperture into account and taking all the aperture into account. In this paper, the element distribution characteristic over the aperture of many optimum thinned arrays is studied, then the aperture release model is founded by the least square method to synthesize the thinned arrays. This model is vital for the computing burden alleviation and the efficiency optimization, and would hardly bring any degradation of the obtained array performance. 相似文献
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In symmetrical thinned linear arrays design, the positions of thinned array elements are very important for optimal performance in terms of its minimum peak side lobe level (Msll). For the synthesis of thinned arrays with a given thinning rate, it would have almost the same Msll solution between taking only segmental aperture nearby both ends of the aperture into account and taking all the aperture into account. In this paper, the element distribution characteristic over the aperture of many optimum thinned arrays is studied, then the aperture release model is founded by the least square method to synthesize the thinned arrays. This model is vital for the computing burden alleviation and the efficiency optimization, and would hardly bring any degradation of the obtained array performance. 相似文献
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通过给经典遗传算法(GA)的变异算子赋予新的功能,实现了任意稀布率的平面阵或线阵方向图的优化.研究了遗传算法参数和优化结果之间的关系,仿真结果表明,同时考虑峰值副瓣电平和波束宽度才能获得更满意的稀布结果.归纳得出一个平面稀布阵峰值副瓣电平的估计公式,并和随机稀布阵的公式进行了比较,数值结果表明该公式有一定的工程意义. 相似文献
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平面稀布天线阵列的优化算法 总被引:2,自引:0,他引:2
基于一种改进的实数遗传算法,以降低平面稀布阵旁瓣电平为优化目标,提出了一种综合有阵元数约束、孔径约束和最小阵元间距约束的稀布面阵的新方法。与稀疏布阵相比,该方法利用了阵元在布阵时更大的自由度,因而在阵元数、孔径和最小阵元间距相同的条件下可以获得更优的峰值旁瓣性能,仿真试验显示了改进的实数遗传算法应用到该多约束稀布平面阵优化问题中是稳健和高效的。 相似文献
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本文首先对遗传算法进行改良,并精心设计了适应函数,以确保遗传算法快速收敛;然后,应用改良后的遗传算法对天线单元正三角形排列的六边形平面阵进行优化稀疏布阵处理,以改善其辐射特性.本文还研究了优化稀疏阵的频率特性,并提出了仅对阵列天线外边缘部分进行优化稀疏处理以达到改善整个阵列天线辐射特性的方法,该方法具有优化区间小和计算量少等优点,为以改善性能和降低造价为目的的大型阵列天线优化稀疏处理提供了一条有效途径.结果表明通过优化稀疏处理,六边形平面阵的辐射特性可以获得相当大的改善,天线阵的最大旁瓣电平降低了7.5~9.4dB,仅对阵列天线外边缘部分单元进行优化稀疏处理可以达到与对全部单元进行优化稀疏处理相同的性能改进. 相似文献