电子科技大学学报2009，Vol.38Issue(1)：17-20,4.
校正高频天波雷达电离层频率调制的级联方法
Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars
摘要
Abstract
Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars. This paper proposes a cascaded approach to correct the ionospheric frequency modulation. This approach consists of two correction steps. At the first step, time-frequency distribution (spectrogram or pseudo Wigner-Ville distribution) of the time-varying signal is adopted and a peak-tracking scheme is designed, to obtain a coarse ionosperic modulation estimation from the time-frequency distribution. At the second correction step, a parametric method based on piecewise polynomial phase model is exploited to eliminate the residual contamination. Simulation results show the effectiveness of this cascaded approach even for very serious cases where broadened Bragg lines are overlapped.关键词
频率调制/电离层/分段多项式相位/天波雷达/时频分布Key words
frequency modulation/ionosphere/piecewise polynomial phase/sky-wave radar/time-frequency distribution分类
信息技术与安全科学引用本文复制引用
刘颜回,聂在平,赵志钦..校正高频天波雷达电离层频率调制的级联方法[J].电子科技大学学报,2009,38(1):17-20,4.基金项目
高等学校学科创新引智计划(B07046) （B07046）
国家863计划(2007AA122159)Foundation item:Supported by the 111 Project(B07046) （2007AA122159）
863program(2007AA122159) （2007AA122159）
