共查询到19条相似文献,搜索用时 265 毫秒
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针对阵列天线中阵列孔径、阵元数目、阵元间距等多约束的稀布线阵综合问题,文中提出了一种基于改
进麻雀搜索算法的稀布阵列综合优化方法。给出了改进麻雀搜索算法的流程,并在确定阵列孔径、阵元数目和最小阵
元间距的约束条件下,采用Tent 混沌映射进行天线阵元位置的初始化,提高算法的搜索性和收敛性,实现了抑制天线
峰值旁瓣电平(PSLL)的稀布线阵综合仿真。仿真结果表明,所提出的方法相比于其它文献中的优化方法,能够得到更
低的峰值旁瓣电平,稳健性好,效率高。在仿真结果的基础上,引入实际天线进行组阵分析,验证了该方法的可行性。 相似文献
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基于粒子群算法的非均匀稀布阵列综合 总被引:1,自引:0,他引:1
给出了一种基于粒子群算法的非均匀稀布阵列综合方法,设计有最小阵元间距约束的稀布阵,通过加入间距约束向量改进了适应度算法,不仅减小了布阵空间,而且消除了优化过程中的不合格个体。在给定阵列孔径和阵元数的条件下,实现了最小阵元间距约束下抑制栅瓣,降低旁瓣电平的阵列综合。通过仿真实例,验证了此方法的高效可行性。 相似文献
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该文针对毫米波共形相控阵天线阵列稀布引起的栅瓣问题,提出了一种最优极化(交叉极化电平最小)条件下的阵列稀布优化准则。该方法首先建立毫米波共形相控阵雷达导引头极化辐射方向图的数学模型,通过对圆极化和线极化两种极化方式下交叉极化电平的比较,选取最优极化方式,选定阵列稀布优化的两组基本参数,然后利用改进的粒子群进化(MPSO)算法优化两组参数条件下的阵元分布,对比阵元分布优化后的天线方向图确定阵列稀布优化的基本准则,来有效抑制由于阵列单元稀布而引发的栅瓣效应。仿真试验证明该准则的合理性。 相似文献
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To reduce the side-lobe level of L-shaped expansion array and improve the output signal to interference and noise
ratio (SINR), the algorithm of side-lobe constraint based on minimum variance distortionless response ( MVDR-
SC) is proposed. Firstly, the approach of mixing diagonal loading and Mailloux-Zatman (DLMZ) is used to taper
the covariance matrix of the expansion array. Then, the second order cone programming ( SOCP) obtained by
constructing a new matrix is used to control the beam side-lobe. Finally, the new adaptive weight numbers are
constructed by adjusting the proportion between DLMZ and SOCP. Simulation results show that the MVDR-SC
algorithm can effectively reduce the side-lobe of beamforming under the L-shaped expansion array and obtain a
larger output SINR. At the same time, it has good robustness to the mutual coupling error. 相似文献
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提出了一种基于粒子群优化算法(PSO)和多重信号分类(MUSIC)算法的分布式目标波达方向(Direction of Arrival,DOA)估计方法。在空间欠采样情况下,该方法首先利用粒子群优化算法优化阵列阵元间距,得到阵列天线方向图高旁瓣电平最小情况下的阵元间距,阵列阵元间距决定了阵列流形,然后在该阵列流形下构造分布式目标信号模型,最后结合分布式目标导向矢量和MUSIC算法获得空间欠采样情况下分布式目标中心DOA的准确估计。仿真结果表明了该方法的有效性。 相似文献
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Reconfigurable antenna arrays are often capable of radiating multiple patterns by altering the excitation phases of the array elements. In this paper, an efficient method based on FFT is presented for generating dual-radiation pattern from a single rectangular planar array by modifying the excitation phases of the array elements while sharing common amplitudes. The common amplitudes shared by both the patterns and the phases which play the role of turning between the two patterns when updated over zero phase among the elements are computed using Self-adaptive Differential Evolution (SaDE) algorithm. Two different beam-pairs of pencil/pencil and pencil/flat-top are generated from the proposed array while maintaining precise design specifications. The proposed method greatly reduces the computational time as compared with the conventional method for calculating beam patterns. The dynamic range ratio of the excitation amplitudes are kept below a threshold level to reduce the design complexity of the attenuators at the feed network level and to minimize the effect of mutual coupling among the array elements. To illustrate the effectiveness of SaDE, the fitness functions associated with the two beam-pairs are minimized individually using differential evolution (DE) algorithm and particle swarm optimization (PSO) algorithm. Results clearly show the superiority of SaDE over DE and PSO to handle the proposed problem. 相似文献
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针对常规自适应波束形成算法在强相干干扰情况下零陷深度不够、甚至干扰抑制失效的问题,提出了一种基于二阶锥规划的相干信号深零陷自适应波束形成算法。该算法首先对接收数据协方差矩阵进行Toeplitz重构,使其包含信号和干扰的所有方位信息。然后重构了干扰加噪声协方差矩阵。接着在保证期望方向波束无失真前提下,约束主瓣宽度和旁瓣电平,使得波束形成器干扰和噪声的输出功率最小。最后将该问题转化为凸优化中的二阶锥规划问题,并使用凸优化工具箱进行快速求解。仿真结果验证了该算法的有效性。 相似文献
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基于自适应稀疏阵的结构,提出了一种具有宽视角与稳定扫描波束分辨率性能的相控阵天线。阵列单元是可以在相同谐振频率下实现TM;和TM;两种模式共同工作的单激励圆环贴片天线,其具有140°的半功率波束宽度,这种宽波束辐射效果能够较好地拓展相控阵天线的扫描范围。基于此单元构建了一个35元线阵,对其波束扫描分析发现在限定增益波动小于2 dB的条件下阵列扫描范围可以达到-70°~+70°,但主瓣波束宽度随着扫描角度的增加而增大。为解决这个问题,引入了自适应稀疏阵的概念,并采用基于互耦补偿矩阵的迭代快速傅里叶变换(Iterative Fast Fourier Transform,IFFT)技术进行自适应稀疏阵的优化设计。结果表明,所提出的基于自适应稀疏阵结构的35单元相控阵天线在-60°~+60°扫描范围内增益波动始终小于1.5 dB,波束宽度波动小于1°,且峰值旁瓣电平基本保持在-20 dB以下。相较于均匀周期阵列,所提出的自适应稀疏相控阵天线能够在实现低旁瓣宽视角扫描的同时,有效提高天线在宽角度范围内扫描波束分辨率的稳定性。 相似文献