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This paper studies a new method named pseudo-MUSIC to detect the impulsive interference (IMI) in the echo data measured by an over-the-horizon radar (OTHR). This is achieved by exploring the Doppler characteristics of the IMI and regarding the spectrum of IMI component as complex cosine signal. After simple clutter suppression for improving the signal-to-noise-ratio (SNR), the proposed pseudo-MUSIC algorithm can explicitly show the IMI-s by means of peaks over a nearly 0dB floor, so easily highlight the IMI-s positions. Experimental data are retrieved from the real OTHR radar system with high frequency surface wave (HFSW). The detection results verifies that the proposed method can figure out the IMI-s effectively. The pseudo-MUSIC algorithm innovatively features the detection on interference instead of target signal, which is rarely seen in other searches.

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