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The performance of the frequency monitor system (FMS) of high frequency (HF) radar is degraded by signal corruption due to impulsive interferences such as lightning and meteor echoes. These interferers raise the FMS spectrum noise level, as a result, FMS canpsilat pick out the real minimum disturbance frequency for HF radar. It is desirable to extract the impulsive interference components from the FMS data without removing any other information. However, current wavelet detecting impulsive interference techniques, not matching impulsive interference very well, always lead to non-impulsive interference components degraded and lost. In this paper, we construct a more suitable impulsive interference detection method, by using the Morlet wavelet, matching well the shape of the impulsive interference signal, decomposition algorithm and maximum likelihood estimation thresholding rule, specifically designed to detect impulsive interference, so as to less disruption to the non-impulsive interference information when extracting the impulsive interference. The effectiveness of the proposed technique has been proved by both simulated and practical experiments.