Radio frequency interference mitigation in HF passive bistatic radar

HF passive bistatic radar (HFPBR) is a novel and promising technique in development. DRM broadcast transmitters supply good choice for the illuminator of HFPBR, owing to the good signal properties and excellent low-altitude coverage. HFPBR based on DRM broadcast is able to detect targets over the horizon and remotely sense sea states. HFPBR working in crowded short wave band, as the active radar, faces with radio frequency interference (RFI) problem. A temporal adaptive processing method based on the RFI characteristics for HFPBR is introduced in this paper. A closed-form approximate solution of maximum likelihood estimator (MLE) has been derived, to improve the estimate accuracy of RFI parameters. And the performance of the new RFI mitigation algorithm are tested on the real data.