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In this study, a new method for sea surface target detection in low signal-to-clutter environment is proposed, which can not only reduce the computation amount but also suppress the sea clutter, static targets and noise. Firstly, the authors use a more general echo signal model, which is more matching for the sea environment. Next, a fast estimation technique with few searching times to reduce the computation of the detection process is put forward. Then, a canceller is designed, which has the merit of suppressing the strong sea clutter, static targets, and noise. Finally, the experiment results demonstrate that the proposed method can achieve high detection probability, fast estimation, and strong suppression ability.