Table 13.

Recognition results of SVM classifier for four categories of target radiated noise under the condition of −20 dB noise.

Ship code	A	B	C	D
010001	0.4489	0	0.2356	0.3156
010002	0.45	0	0.2211	0.3289
020001	0.685	0.0917	0.0375	0.1858
030004	0.36	0	0.3067	0.3333
030005	0.3967	0	0.285	0.3183
030006	0.1717	0	0.695	0.1333
040002	0.3367	0	0.1483	0.515
040003	0.365	0	0.26	0.375
040004	0.325	0	0.265	0.41

Bold represents the recognition accuracy of a certain numbered ship under the correct classification category.