电离层随机变化对OTH雷达坐标配准的影响  

Effects of random changes in ionosphere on OTH radar coordinate registration

作　　者：周晨[1] 赵正予[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《电波科学学报》2008年第5期894-898,共5页Chinese Journal of Radio Science

摘　　要：基于电离层实测数据,通过参数统计再取样的方法(bootstrap)建立了一种电离层随机变化模型,在此模型的基础上,用射线追踪的方法讨论了电离层随机扰动对超视距雷达坐标配准的影响。并提出了通过极大似然估计的方法改善这种扰动的影响,最后与最小方差法进行了比较,其对电离层随机扰动影响的改善要优于最小方差的估计。A new statistical ionospheric model is investigated using bootstrap method based on the real data from ionospheric sounders in this paper. The effects of random disturbance in the ionosphere on OTH radar coordinate registration are discussed using raytracing based on the proposed model. Additionally, maximum likelihood estimation （MLE） is employed to reduce the random disturbance of ionosphere, and furthermore the result from minimum variance estimate （MVE） method is compared, which indicates that the MLE method is better than MVE method for the mitigating the random disturbance of ionosphere.

关 键 词：射线追踪 统计电离层模型 极大似然估计 统计再抽样 

分 类 号：TN958.93[电子电信—信号与信息处理]