行波扰动对天波雷达慢速目标检测影响研究  

TIDs effect on low speed target detection of OTHR

作　　者：李雪[1] 李吉宁[1] 娄鹏[1] 冯静[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2期295-299,共5页Chinese Journal of Radio Science

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

摘　　要：利用电离层行波扰动(Traveling Ionospheric Disturbances,TIDs)模型,仿真分析了不同尺度TIDs引起的超视距雷达(Over the Horizon Radar,OTHR)地海杂波频谱频移、展宽以及对舰船目标检测的影响.结果表明:小尺度TIDs引起的附加多普勒频移幅度较小,但随时间变化较快,S形曲线扭曲较为严重,对OTHR影响主要表现为多普勒频移;中尺度和大尺度TIDs引起的附加多普勒频移相对于小尺度TIDs的有所增加,但随时间变化减缓,S形曲线扭曲程度减小,除引起地海杂波多普勒频移外,同时引起杂波频谱展宽,影响舰船目标检测.同时,还给出了不同尺度TIDs引起的海杂波频移、展宽抑制方法,经仿真验证,上述算法有效.Using the model of travelling ionospheric disturbances(TIDs),the Doppler shift causing by different scales TIDs is simulated,and the spread of land or sea clutter spectrum and its effects on ship detection for over-the-horizon radar(OTHR)are analyzed.The result indicates that for small-scale TIDs,the amplitude of Doppler shift is small but changes rapidly,and the S-shaped distortion is obvious,which have an impact on OTHR mainly presented the Doppler shift.Doppler shift caused by mesoscale and large-scale TIDs is slightly larger than that caused by small-scale TIDs,but it is changed meditatively with time,and the S-shaped distortion is weakened.Besides the sea clutter Doppler shift,it causes clutter spectral spread and affects the ship detection.Meanwhile,the suppression method for frequency shift and spread caused by different scale TIDs is simulated.And the simulation results show that the algorithm is effective.

关 键 词：电离层行波扰动 天波超视距雷达 慢速目标检测 

分 类 号：TN958.93[电子电信—信号与信息处理]