高频返回散射探测中一种特殊现象成因及特性分析  

Causes and characteristics analysis of abnormalities in HF backscatter system

作　　者：李吉宁[1] 李雪[1] 杨东升[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4期699-703,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金青年基金(61302006;61032011);中国电科技术创新基金(JJ-QN-2013-28)

摘　　要：在高频返回散射定频探测多普勒谱中,存在一种具有"弯钩"形状的地海回波,该现象是影响天波雷达海面目标检测的重要因素之一.针对该现象,在建立时变电离层模型基础上,利用射线追踪技术获得多普勒信息,实现返回散射定频探测仿真.仿真结果表明,该现象主要由电离层高低角传播和电离层电子浓度变化引起,电离层参数对"弯钩"多普勒偏移和距离位置具有明显影响.There is a'hook-shaped'echo from sea or land in HF backscatter system,which interferes with ship detection of HF skywave radar.In order to simulate the phenomenon,time-varying ionospheric model is built,and the Doppler shift of ray is analyzed to get Doppler information.The simulation results show that the phenomenon is mainly caused by the ionospheric propagation on low and high angle,and the changing of electron concentration of ionosphere.The Doppler and range of the'hook'is different when ionospheric parameters change.

关 键 词：高频返回散射 电离层 天波超视距雷达 射线追踪 

分 类 号：TN011[电子电信—物理电子学]