Time-frequency entropy of Hilbert-Huang transformation for detecting weak target in sea clutter

In this paper, Hilbert-Huang transformation is adopted for analyzing the sea clutter with the fixed weak target. It's found that the fixed target only affects the low frequency component of the sea clutter. So the time-frequency entropy of the low frequency component is applied for the weak target detection. Compared with another weak target detection method directly using the box dimension, the method proposed in this paper improves the effect of the fixed target on the sea clutter. And the detection performance of the fixed weak target is improved distinctly.