Radio Frequency Interference Suppression by Adaptive Filter Design for High-Frequency Radar

High-frequency (HF) over-the-horizon (OTH) radar are often affected by radio frequency interference (RFI) from co-channel services. This paper proposes adaptive receive filter design to suppress the RFI via pulse compression. First, according to the Doppler characteristics of sea clutter and RFI, observation statistics are designed to detect the sea clutter region. Then, the RFI spectrum is detected using the consecutive mean excision (CME) algorithm based on the power spectrum analysis of residual sea clutter and noise. Finally, the receive filter is designed under an adaptive similarity constraint and then used for pulse compression. Simulation results show that the proposed scheme can detect and suppress RFI accurately.