雷达科学与技术Issue(6)：660-666,7.DOI:10.3969/j.issn.1672-2337.2015.06.018
一种天波超视距雷达电离层相位污染的校正算法
A Correction Algorithm for Ionospheric Phase Contamination in Sky-Wave Over-the-Horizon Radar
摘要
Abstract
The significant Doppler spread of over-the-horizon radar(OTHR)echoes induced by the time-variant phase modulation of ionosphere limits the detection performance for low-speed targets,such as ships. Considering the spreading and overlapping Bragg peaks caused by ionospheric phase contamination with large amplitude in long coherent integration time(CIT),a joint correction scheme based on wavelet transform and the method of hypothetical model is proposed in this paper.In the scheme,wavelet transform is firstly used to compensate the echo phase so that the positive and negative Bragg peaks can be roughly distinguished. Then an adaptive sliding window filter based on power ratio is applied to extract the calibration signal,and accurate phase contamination correction is carried out based on the hypothetical model in time domain.The simulation results show that the scheme is effective for the situation of the two Bragg peaks overlapping caused by ionospheric phase contamination with large amplitude,and has a better performance than the im-proved maximum entropy spectrum analysis (MESA)method.关键词
天波超视距雷达/相位污染校正/小波变换/电离层Key words
over-the-horizon radar(OTHR)/phase contamination correction/wavelet transform/ionosphere分类
信息技术与安全科学引用本文复制引用
于文启,陈建文,杨春山..一种天波超视距雷达电离层相位污染的校正算法[J].雷达科学与技术,2015,(6):660-666,7.基金项目
国家自然科学基金(No.61471391) （No.61471391）
