Grating lobe reduction in a phased array of limited scanning
Grating lobe reduction in a phased array of limited scanning
复制标题
有限扫描相控阵中的栅瓣减少
DOI：
10.1109/tap.2008.923354
复制
发表时间：
2008-06-01
影响因子：
5.7
通讯作者：
Chow, Y. Leonard
中科院分区：
文献类型：
--
作者：
Wang, Hao;Fang, Da-Gang;Chow, Y. Leonard
仅子阵列输出处的幅度和相位加权就会导致阵列因子中的光栅瓣（GLs）。提出了一种破坏阵列周期性的组合方法来降低GLs。在这种方法中，同时使用了三个度量。分别是：(1)优化后的子阵端口幅度加权；(2)使用随机子数组；(3)随机错开的行。采用遗传算法进行优化。设计了24（沿X） X 32（沿Y）相控阵来验证所提出的方法。沿着Y，扫描范围是（-10度，+10度），并且使用子数组。沿着X，扫描范围是（-45度，+45度），不使用子数组。通过阵列因子进行比较。在整个二维扫描空间中，仿真结果表明，常规阵列时的GL为-3.77 dB，单独使用(1)时的GL为-4.28 dB，单独使用(2)时的GL为-11 dB，单独使用(3)时的GL为-14dB，本文提出的组合方式时的GL为-20 dB。该方法可用于限制扫描的相控阵和自适应消零的数字波束形成天线阵列。
Amplitude and phase weighting at the subarray outputs alone causes grating lobes (GLs) in the array factor. A combined approach to disrupt the periodicity in the array is proposed to reduce the GLs. In this approach, three measures are simultaneously used. They are: (1) the optimized amplitude weighting at the subarray ports; (2) using the random subarray; and (3) the random staggering of the rows. The optimization was carried out by using genetic algorithms (GAs). The 24 (along X) x 32 (along Y) phased array was designed to verify the proposed approach. Along Y, the scan range is (-10 degrees, +10 degrees) and the subarrays are used. Along X, the scan range is (-45 degrees, +45 degrees) without using the subarrays. The comparison was done through array factor. In the whole two dimensional scan space, the simulated results show that the GL is -3.77 dB when using the conventional array, -4.28 dB when using(I)alone, -11 dB when using (2) alone, -14dB when using (3) alone, -20 dB when using the combined approach proposed in this paper. This approach can be used for a phased array with limited scanning and for the digital beamforming antenna array with adaptive nulling.