Figure 14

Phase diagrams after by noise reduction by five methods on four types ship-radiated signal, in the four subgraphs I, II, III, IV, (a) Original phase diagram of ship-radiated signal; (b) Phase diagrams after FEM-SVD denoising; (c) Phase diagrams after TQWT denoising; (d) Phase diagrams after CEEMDAN-WT denoising; (e) Phase diagram after MEEMD-WT denoising; (f) Phase diagram after TQWT-ASVD denoising;