毫米波共形相控阵雷达导引头的阵列稀布优化
doi: 10.3724/SP.J.1146.2008.01798
Optimization of Thinned Array for Millimeter Wave Radar Seeker with Conformal Phased Array
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摘要: 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。Abstract: A novel criterion for thinning array optimization based on optimal polarization (minimization of the cross-polarization level) is proposed to suppress the cross-polarization level and solve the problem of grating lobes arisen from thinning array in millimeter wave conical phased array. The mathematical model based on the radiation pattern of the radar seeker polarization is developed firstly. Then the optimal polarization mode is chosen by comparing the cross-polarization level of circular polarization with that of linear polarization, and two groups basic parameters are determined sequentially. Finally the Modified Particle Swarm Optimization(MPSO) algorithm is applied to optimize the configurations of the elements under two groups of parameters, and then the criterion for thinned array optimization is obtained by compare the array patterns of the two configurations, thus the grating lobes are effectively suppressed. Simulation results verify the rationality of the proposed principle.
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