为了抑制电离层对高频地波雷达回波的干扰,文中提出了一种基于广义S变换(GST)的时频滤波方法,通过GST将受电离层污染的时域数据转换为时频域进行分析和处理,根据相邻时间窗信号和电离层杂波的相关性不同,依次将时间窗内数据构建Hankel矩阵,再进行子空间滤波,最终达到减轻电离层干扰的目的。通过与传统方法比较及实测数据处理分析,回波频谱中的电离层杂波抑制取得了较好的结果,进而验证了本方法在电离层杂波抑制中的可行性和有效性。

In order to suppress the ionospheric interference to the high frequency ground wave radar echo, a generalized S-transform (GST) based time frequency filtering method is presented in this paper. Converting ionospheric contaminated time-domain data into time-frequency domain for analysis and processing by GST. Based on the correlation between adjacent time-window signals and ionospheric clutter, Hankel matrix is constructed from the data in time-window in turn, and then subspace filtering is applied to reduce the ionospheric interference. Analysis is done by comparing with traditional methods and by processing measured data. The ionospheric clutter suppression in the echo spectrum obtained good results. The feasibility and validity of this method in the ionospheric clutter suppression are verified.

TN957

国家自然科学基金资助项目(61661009)