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提出了一种新的抑制射频干扰(RFI)方法,通过短时傅里叶变换找到干扰的时间位置,应用经验模态分解(EMD)方法,去除满足一定频域条件的射频干扰,达到在抑制射频干扰的同时,最大程度上保留有用信号的目的.实测数据分析表明:该方法在不损失有用信号的基础上有效抑制了射频干扰,且处理速度快,满足高频地波雷达(HFGW)实时工作要求.
A new method of suppressing radio frequency interference (RFI) is proposed. By finding the time position of interference through short-time Fourier transform, empirical mode decomposition (EMD) method is applied to remove radio frequency interference that meets certain frequency domain conditions, Radio frequency interference at the same time, the purpose of retaining the maximum useful signal.The measured data analysis shows that: This method can effectively suppress the radio frequency interference without loss of useful signal, and the processing speed, to meet the high frequency ground wave radar (HFGW) real-time Work requirements.