Study on Multi-Frequency Signal Detection Based on the Method of Combined EMD and MFF

The rapid development of modern submarine vibration and noise reduction technology has greatly reduced the noise level of high-frequency radiation. Therefore, the traditional underwater weak and small target signal detection technology based on statistical detection theory is difficult to meet the practical needs and seriously affects the detection performance. Focusing on the rare problem of multi-frequency weak signal detection of underwater moving targets, this paper proposes a weak signal detection method based on EMD and multi-feature fusion, which can realize multi-frequency signal detection of underwater weak and small targets in long-distance low signal to noise ratio marine environment, further improve the probability of signal detection, and improve the effectiveness and reliability of underwater weak and small object detection.