利用分数阶Fourier变换抑制高频地波雷达中线性调频干扰
Linear Frequency Modulated Interference Suppression Using FRFT for HF Ground Wave Radars
摘要
Abstract
High frequency( HF) ground wave radar( HFGWR) system is severly affected by radio-frequen-cy interference ( RFI ) . Single frequency RFI behaves as high-amplitude signal under the mechanism of linear frequency modulation ( LFM) and consequently pollutes signal in all range cells. For suppressing RFI,by analyzing its frequency characteristics,fractional Fourier transform( FRFT) is used to convert the original signal into fractional Fourier domain and RFI peaks are set to zero. The advantage of this approach is that it can suppress RFI without losing echo signal at the location of RFI and does no need to reconstruct signal. Analysis of measured data shows that FRFT can effectively suppress RFI and improve signal-to-noise ratio( SNR) more than 10 dB,while its low computing complexity is able to meet the real-time pro-cessing requirement of radar system.关键词
高频地波雷达/射频干扰抑制/线性调频信号/分数阶傅里叶变换Key words
HF ground wave radar/radio-frequency interference suppression/linear frequency modulated signal/fractional Fourier transform分类
信息技术与安全科学引用本文复制引用
谢岱玲,陈泽宗,洪羽萌,陈羽洁,叶彩云,谢飞..利用分数阶Fourier变换抑制高频地波雷达中线性调频干扰[J].电讯技术,2016,56(3):313-318,6.基金项目
国家自然科学基金资助项目(41376182,41506201) （41376182,41506201）
中国博士后科学基金项目(2013M531738) （2013M531738）
中央高校基本科研业务费专项(2042014kf0028) （2042014kf0028）
海洋公益性行业科研专项(201205032) （201205032）
湖北省科技支撑计划项目(2014BEC057) （2014BEC057）
国家海洋局数字海洋科学技术重点实验室开放基金项目(KLD0201401) Foundation Item:The National Natural Science Foundation of China(No.41376182,41506201) （KLD0201401）
China Postdoctoral Science Foundation (2013M531738) （2013M531738）
Fundamental Research Funds for the Central Universities(2042014kf0028) （2042014kf0028）
Marine Scientific Research Special Public Welfare Industry(201205032) （201205032）
The Science&Technology Pillar Program of Hubei Province(2014BEC057) （2014BEC057）
The Fund of Key Laboratory of Digital Ocean Science and technology,State Oceanic Administration(KLD0201401) （KLD0201401）
