A Global-Local Synthesis Approach for Large Non-Regular Arrays
A Global-Local Synthesis Approach for Large Non-Regular Arrays
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DOI：
10.1109/tap.2013.2284816
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发表时间：
2014-04
影响因子：
5.7
通讯作者：
Thibault Clavier;N. Razavi-Ghods;François Glineur;D. González-Ovejero;E. de Lera Acedo;C. Craeye;P. Alexander
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文献类型：
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作者：
Thibault Clavier;N. Razavi-Ghods;François Glineur;D. González-Ovejero;E. de Lera Acedo;C. Craeye;P. Alexander
本文提出了一种假定阵元激励幅值恒定的大型平面非规则阵综合方法。该方法结合了全局和局部优化，基于区分孔径类型和非相干部分的阵列因子。考虑了天线间距最小、天线阵最大尺寸和主波束宽度固定等约束条件。通过基于Lp范数的新型灵活平均代价函数的最小化来降低旁瓣的水平。这一模型可能的应用领域包括射电天文学、卫星通信和雷达系统。所提出的优化策略包括三个连续的步骤，设计为彼此独立。从等效连续孔径开始，前两个步骤充当初始阵列中的元件的径向和方位角位置的全局变换，而第三个步骤执行阵列的各个元件的局部优化。最后一步严重依赖于成本函数梯度的计算，这可以使用基于FFT的过程快速完成。该方法说明了几个大规模的例子，考虑作为输入的四种不同类型的非规则阵列。
A method is proposed for the synthesis of large planar non-regular arrays assuming constant magnitude for the excitation of the elements. The approach, which combines global and local optimization, is based on distinguishing aperture-type and non-coherent parts of the array factor. The following constraints are considered: minimal separation of the antennas, maximum size of the array and fixed mainbeam width. The level of the sidelobes is reduced via the minimization of a new type of flexible averaging cost function based on an Lp-norm. Possible applications of this model lie in the field of radio astronomy, satellite communications and radar systems. The proposed optimization strategy consists of three successive steps designed to be independent of each other. Starting with an equivalent continuous aperture, the first two steps act as global transformations of the radial and azimuthal positions of the elements in the initial array, while the third step performs a local optimization of individual elements of the array. This last step heavily relies on computations of the gradient of the cost function, which can be done quickly using an FFT-based procedure. The method is illustrated for several large-scale examples by considering as inputs four different types of non-regular arrays.