Oblique projection polarization filter (OPPF) can be applied as an effective approach for interference cancellation in high-frequency\nsurface wave radar (HFSWR) and other systems. In order to suppress the nonstationary ionosphere clutter further, a novel OPPF\nbased clutter suppressing scheme is proposed in this paper.The polarization and nonstationary characteristic of the clutter are taken\ninto account in the algorithms referred to as range-Doppler domain polarization suppression (RDDPS) and the range-time domain\npolarization suppression (RTDPS) method, respectively.The RDDPS is designed for weak ionosphere clutter and implemented in\nthe range-Doppler domain directly, whereas the RTDPS algorithm is designed to suppress the powerful ionosphere clutter with a\nmultisegment estimation and suppression scheme. About 15ââ?¬â??23 dB signal to interference ratio (SIR) improvement can be excepted\nwhen using the proposed method, whereas the targets can be more easily detected in the range-Doppler map. Experimental results\ndemonstrate that the scheme proposed is effective for nonstationary ionosphere clutter and is proven to be a practical interference\ncancellation technique for HFSWR.
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