Radio frequency interference suppression filters design for HF radar based on SOCP

Abstract

High-frequency radar is easily affected by radio frequency interference (RFI) since it shares the band with many radio services. To mitigate the RFIs, this study designs receiver for radar's fast-time processing. Two optimisation problems are, respectively, proposed, both involving an objective function accounting for maximising the signal-to-interference plus noise ratio, but are distinguished with different constrains for sidelobes control. Furthermore, the authors show that the two proposed problems both can be reformulated as the second-order cone programming, hence some well-established interior point methods can be introduced to resolve them. Simulation results show that the designed filters can precisely control the sidelobe level from different perspectives, with the RFIs suppressed to achievable greatest extent.