一种新的动态分形海面模型及其电磁散射统计特性研究  

A New Time-varying Fractal Sea Model and Its Statistical Characteristics of Electromagnetic Scattering

作　　者：万建伟[1] 王展[1] 杨俊岭[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2007年第5期35-40,共6页Journal of National University of Defense Technology

基　　金：国家部委基金资助项目(41321090202)

摘　　要：给出了一种更符合海面实际情况的基于未充分发展海谱的分形海面模型(NDFFM),使用双尺度法计算了NDFFM海面的后向散射截面,并研究了动态散射场幅值分布。结果表明在大特征斜率下散射场服从K分布,随着特征斜率的下降,散射场分布向瑞利分布退化。最后将计算数据与传统的分形模型和实测雷达数据进行比对,证明了该模型的准确性和有效性。A fractal sea model based on non-fully developed full-range sea spectrum(NDFFM),which is believed to be more applicable to the real sea surface,is presented.The two-scale method is used to calculate the backscattering cross-section of the NDFFM sea surface.The distribution of the time-varying scattering amplitude is studied,and the numerical results show that the distribution satisfies K-distribution with higher significant-slope(SS) and satisfies Rayleigh distribution with lower SS.Finally,the results are compared with those of the conventional fractal model and the real radar data,which prove the accuracy and efficiency of this model.

关 键 词：未充分发展 海谱 分形模型 电磁散射 海杂波 K分布 瑞利分布 

分 类 号：TN951[电子电信—信号与信息处理]