Abstract:

Oblique projection polarization filtering is a valid approach to suppress interference in highfrequency surface wave radar (HFSWR). The effect on the performance of oblique projection polarization filter by the biased estimation of the interference is analyzed. Compared with rangetime domain, it benefits from higher estimation accuracy and better interference suppression performance in rangeDoppler domain, due to the higher interference to noise ratio after Doppler processing. Therefore, a method for polarization cancellation of ionospheric clutter based on rangeDoppler domain is proposed in this work. Experimental result of practical dualpolarized HFSWR data demonstrates that the proposed method is effective for ionospheric clutter suppression and the signaltointerference ratio can be increased by more than 15 dB.