一阶海杂波电离层多普勒频移和展宽  

Ionospheric Doppler Shift and Spread of First Order Sea Clutter

作　　者：李宁[1] 赵正予[2] LI Ning;ZHAO Zhengyu(The 27th Research Institute of CETC,Zhengzhou 450047,China;School of Electronic Information,Wuhan University,Wuhan 430079,China)

机构地区：[1]中国电子科技集团公司第二十七研究所,河南郑州450047 [2]武汉大学电子信息学院,湖北武汉430079

出　　处：《无线电工程》2018年第9期793-798,共6页Radio Engineering

基　　金：国家自然科学基金资助项目(41327002)

摘　　要：为研究天波超视距雷达一阶海杂波电离层多普勒频移和展宽的变化规律,从电离层斜向返回探测海杂波功率谱中提取出不同电离层传播模式下的多普勒数据,对宁静地磁条件和发生磁暴2种情况分别进行了分析。结果表明,宁静地磁条件下,Es层多普勒频移绝对值和多普勒展宽比F层小,并且稳定得多,更有利于天波超视距雷达对海面舰船目标进行检测和跟踪;磁暴发生期间,电离层多普勒频移绝对值及其不稳定度显著增加,多普勒展宽及其不稳定度也有所增加,从而导致天波超视距雷达对海面舰船目标的检测和跟踪能力下降。In order to study the variation of ionospheric Doppler shift and spread of first order sea clutter observed by the sky-wave over the horizon radar,the Doppler data in different ionospheric propagation modes are extracted from the sea clutter power spectrum recorded by utilizing oblique backscattering sounding technology. The Doppler data observed in the quiet geomagnetic condition and during the geomagnetic storm are both analyzed. The data analysis results show that： in the quiet geomagnetic conditions,the Doppler shift absolute value and Doppler spread of the Es layer are both smaller and far more stable than those of the F layer,so the Es layer is more beneficial for the detection and tracking of the ship targets using the sky-wave over the horizon radar; during the geomagnetic storm,the absolute value of the ionospheric Doppler shift and its instability are significantly increased,and the ionospheric Doppler spread and its instability are also increased,leading to decrease of the ship targets detection and tracking ability of the sky-wave over the horizon radar.

关 键 词：天波超视距雷达 电离层斜向返回探测 多普勒频移 多普勒展宽 

分 类 号：P352[天文地球—空间物理学]