电离层相位污染分类识别方法研究  

Research on Classification and Recognition Method of Ionospheric Phase Contamination

作　　者：鲁转侠[1] 李吉宁[1] 李雪[1] 郭晓彤[1] 白桦 LU Zhuan-xia LI Ji-ning LI Xue GUO Xiao-tong(China Research Institute of Radiowave Propagation, Qingdao Shandong 266107, China Group 63898, henan jiyuan 454650)

机构地区：[1]中国电波传播研究所 [2]63898部队

出　　处：《中国电子科学研究院学报》2016年第5期503-509,共7页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金项目(61302006);国家自然科学基金项目(61331012)

摘　　要：电离层的非平稳特性使得经电离层传播的雷达回波信号相位扰动,长时间相干积累后杂波频谱展宽,影响舰船等目标信号检测.通过电离层回波信号相位分析统计,建立了电离层相位污染分类准则,基于该准则能够有效地将电离层污染划分为四类具有典型特征的电离层相位污染.基于数据挖掘技术中的聚类分析算法,提出了一种电离层相位污染类型自动识别算法,能够自动识别探测数据的相位污染类型,自动识别结果与相位统计分类结果匹配率平均达30.6%.在电离层相位污染分类研究的基础上,采用已有典型解污染算法,开展了不同类型污染的适用性抑制方法研究,结果最大熵谱估计法对"小幅度慢变化"和"大幅度慢变化"污染的抑制有效率分别达55.6%和60%;相位梯度法对"大幅度快变化"污染的抑制有效率达77.4%.因此证明合理实时的电离层相位污染类型识别能够为解污染算法创造较优越的使用条件,从而有效提高电离层解污染的性能,对提高天波超视距雷达舰船等目标检测性能具有重要意义。The non-stationary characteristic of the ionosphere makes the phase disturbance of the radar echo signal of the ionosphere,long time coherent accumulation leads to the spread of clutter spectrum,this affects the ship and other target signal detection.By phase analysis of the ionospheric echo signal,the classification criterion of the ionospheric phase contamination are established.Based on this criterion,the ionospheric contamination can be divided into four types.An automatic recognition algorithm for ionospheric phase contamination is proposed based on the clustering analysis algorithm in data mining,this algorithm can automatically recognize the contamination type.The matching rate of the automatic recognition result and the phase statistical classification result is 30.6%on average.On the basis of the classification of ionospheric phase contamination,the correction algotithms has been studied by using the existing typical algorithms for different types of ionospheric contamination,the results are that success rates of the maximum entropy method are 55.6%and 60%respectively for the two kinds of small-amplitudeslow-hange contamination and large-amplitude slow-change contamination,the success rate of phase gradient method is 77.4%for large-amplitude-fast-change contamination.Therefore,it is proved that the reasonable real-time type recognition of ionospheric phase contamination can be used to create more favorable conditions for contamination correction,so as to effectively improve the performance of contamination correction,this has important significance for improving the performance of OTHR ship target detection.

关 键 词：电离层 数据挖掘 斜向探测 返回散射 

分 类 号：TJ01[兵器科学与技术—兵器发射理论与技术]