Adaptive Design of Receiving Filter for Radio Frequency Interference Suppression in High-Frequency Radar
In order to suppress the radio frequency interference(RFI)in high-frequency(HF)radar,an adaptive filter design method is proposed in this paper.Firstly,based on the Doppler characteristics of sea clutter and RFI,an adaptive detection algorithm for sea clutter region is designed to estimate the RFI characteristics effectively.Then,based on the power spectral analysis of sea clutter,noise and RFI,a consecutive mean excision algorithm is employed to detect the presence of RFI and its frequency range.Finally,a similarity constraint based receive filter algorithm is used to automatically calculate the constraint parameters according to the RFI frequency band,so as to adaptively design the receive filter to achieve robust suppression of RFI.Simulation results show that,compared with the traditional whitening filter,the proposed filter can effectively suppress both broadband and narrowband RFIs and improve radars'anti-inter-ference capability.
high-frequency radarradio frequency interferencereceive filterconsecutive mean excision algorithm
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