ID 原文 译文
24155 在假设移动散射体的运动速度和方向都随机且运动速度较小和较大的散射体速度分别用指数分布和混合高斯分布来描述的情况下，给出了这些传播信道的复增益，通过计算得到了信道的自相关函数(ACF)和多普勒功率谱密度(PSD)。 It is assumed that the local scatterers move with random velocities in random directions and the velocity distributions of the moving scatterers with low and high speed are assumed to follow exponential and Gaussian Mixture (GM) distributions, respectively. The complex channel gains of the proposed V2V channel models are proposed, and the corresponding AutoCorrelation Function (ACF) and Doppler Power Spectral Density (PSD) are derived.
24156 文中还将理论计算得到的多普勒谱与已有文献的测量结果进行了对比，两者符合得较好。 The theoretical results are also compared with the available PSDs by measurements and good agreements are found between them.
24157 基于遗传算法的激励优化算法是求解阵列天线波束赋形问题时常用的激励求解算法。 Excitation optimization algorithm based on Genetic Algorithm (GA) is mainly used to solve the excitation problems of array antenna beam shaping.
24158 传统遗传算法在优化阵列天线激励时，对阵元天线方向图矢量叠加获得阵列天线合成方向图后，与目标方向图做相似度判断，经过多次运算获得满足设计要求的激励值。 When optimizing the excitation of array antenna by traditional genetic algorithm, the beam of array antenna is synthesized by radiation shape of elements in antenna array, and then the results will be compared with the target pattern. After several operations, the excitation will meet the deign requirements.
24159 然而算法中通常不关注赋形结果的副瓣抑制，导致阵列天线波束赋形结果副瓣抑制效果不理想。 However, in traditional genetic algorithm, neglected suppression of side lobe leads to an unsatisfactory high level side lobe.
24160 该文提出一种基于一组低副瓣波束线性叠加的波束合成机制，将合成方向图与目标方向图做相似对比，结合遗传算法的优化求解方法，最终获得与目标方向图匹配的合成方向图，且合成方向图具有高副瓣抑制的特性。 In this paper, a new method of beam synthesizing by peak beam of array antenna is proposed. By comparing the shape of synthesized beam with target beam and combining with traditional GA, the synthesized beam matching the target beam with low side lobe will be obtained.
24161 以一款 16 阵元X波段微带偶极子线性阵列天线为例，该文提出的具有副瓣抑制机制的遗传算法求得的赋形波束获得了-27.5dBc的副瓣抑制效果，远远好于传统遗传算法求得的赋形波束-19dBc的副瓣抑制。 Taking a 16 elements X band micro-trip dipole linear array antenna as an example, the results of simulation show that array antenna has high level side lobe suppression at about -27.5 dBc using the method proposed in this paper, which is much better than -19 dBc side lobe suppression using traditional GA.
24162 距离向分块快速分解后向投影(Block-FFBP)算法通过子孔径合成降低了传统 BP 的算法复杂度，并且通过距离向分块，简化了繁琐的极坐标与直角坐标的转换。 Block Fast Factorized Back-Projection (Block-FFBP) algorithm adopts a subaperture synthesis approach to reduce the computing complexity of the conventional BP algorithm, and partitions the echo data into blocks in range to avoid the complicated transforms between polar and Cartesian coordinates.
24163 然而，距离分块操作使各块引入了斜距范围波动，而且插值核长度余量导致了算法的内存效率低下，从而降低了成像效率。 However, Block- FFBP results in a range span vibration of the data blocks, and Block-FFBP needs an extra data length associated with the interpolation kernel. That gives rise to the inefficiency of the memory, and furthermore the degradation of the imaging speed.
24164 该文提出一种基于距离向整体处理的 Bulk-FFBP算法，并细分为基于距离向控制点的 Bulk-FFBP 以及无控制点的 Bulk-FFBP。 A range Bulk processing based FFBP (Bulk-FFBP) algorithm is proposed in this paper. It is implemented in two ways. One is based on a series of range pivots, and the other one is of no pivots.