天波超视距雷达多模传播抑制研究  

OTHR multi-mode propagation suppression

作　　者：李雪[1] 李吉宁[1] 冯静[1] 蔚娜[1] 郭文玲[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107

出　　处：《电波科学学报》2015年第1期57-62,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金青年基金(No.61302006);中国电科技术创新基金(No.JJ-QN-2013-28)

摘　　要：电离层多模传播引起天波超视距雷达杂波频谱大幅展宽,严重制约海面慢速目标检测.给出了基于工作频率选择的多模传播抑制方法,指出该方法的核心问题是全频段电离层传播模式信息获取,可通过电离层返回散射探测传播模式区提取解决.结合电离层电波传播理论、信号处理、图像处理、统计分析、射线追踪等多类方法,以准抛物模型为基础,提出了一种多模传播下传播模式区域智能提取算法,实现针对某一指定探测区域的单模式工作频率选择,从而有效抑制多模传播.Over-the-horizon radar(OTHR)clutter spectrum broadening caused by ionospheric multi-mode propagation considerably restricts the detection of low-speed target on sea surface.A multi-mode propagation suppression method based on working frequency selection is presented,the key point of which is to acquire the ionospheric propagation mode information of full frequency range that can be solved by backscattering detection propagation mode extracting.Combined with methods of ionospheric radio propagation theory,signal processing,image processing,statistical analysis and ray tracing,a novel algorithm to extract backscattering ionogram frontier,retral and caudal based on the quasi parabolic model is proposed,using which the regional propagation mode intelligent extraction under the multi-mode propagation is implemented and thereby the single-mode working frequency selection aiming at the specified region is finally actualized.

关 键 词：适应频率选择 返回散射探测 多模传播 传播模式区 

分 类 号：TN958.93[电子电信—信号与信息处理]