Weak Target Detection Based on Intrinsic Mode Energy Entropy

In the paper, the percentage of the Intrinsic Mode Function (IMFs) energy in the whole sea clutter energy is analyzed, the percentage variation affected by the target is discussed. As shown of the results, the energy of the pure sea clutter is focused on the former 3 IMFs, but the latter 6 IMFs are pervaded by the energy of the sea clutter when the target appears, and the intrinsic mode energy entropy can describe the variational distribution of the energy when the target appears. So the intrinsic mode energy entropy is proposed to detect the weak target. Compared with the target detection method directly using the box dimension and the multi-pulses CA-CFAR (100 pulses) and the CFAR target detection method in frequency domain, the method proposed improves the detection performance of the weak target in the sea clutter distinctly.