Optimizing the radiation pattern of sparse periodic linear arrays
Optimizing the radiation pattern of sparse periodic linear arrays
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DOI：
10.1109/58.484457
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发表时间：
1996-01-01
影响因子：
3.6
通讯作者：
Foster, FS
中科院分区：
文献类型：
--
作者：
Lockwood, GR;Li, PC;Foster, FS
我们提出了一种稀疏周期阵列的设计方法，通过在发射和接收上使用不同的单元间距来避免双向辐射方向图中的光栅瓣。所选择的发射和接收孔径函数使得孔径函数的卷积产生所需的有效孔径。理想的有效孔径是具有适当宽度、元件间距和形状的孔径，使该函数的傅里叶变换得到理想的双向辐射图。如果采用合成孔径方法，就有可能精确地解决这个问题。然而，对于常规成像，通常只能找到所需有效孔径的近似值，本文描述了获得这些近似值的不同策略。利用有效孔径概念设计的稀疏阵列的辐射方向图与密集阵列、周期性和随机元间距稀疏阵列的辐射方向图进行了实验比较。我们表明，在128元线性阵列中，元件的数量可以减少至少四倍，而阵列的波束形成特性几乎没有退化。
We have developed a method for designing sparse periodic arrays, Grating lobes in the two-way radiation pattern are avoided by using different element spacings on transmission and reception. The transmit and receive aperture functions are selected such that the convolution of the aperture functions produces a desired effective aperture. A desired effective aperture is simply an aperture with an appropriate width, element spacing, and shape such that the Fourier transform of this function gives the desired two-way radiation pattern. If a synthetic aperture approach is used, an exact solution to the problem is possible. However, for conventional imaging, often only an approximation of the desired effective aperture can be found, Different strategies for obtaining these approximate solutions are described. The radiation pattern of a sparse array designed using the effective aperture concept is compared experimentally with the radiation patterns of a dense array, and sparse arrays with periodic and random element spacing. We show that the number of elements in a 128-element linear array can be reduced by at least four times with little degradation of the beam forming properties of the array.