Research on underwater acoustic weak signal detection method based on multi-resolution analysis

In order to solve the problem of detecting weak underwater acoustic signals under complex sea conditions, the theory of multiple precision analysis (MRA) is used to deal with the weak surface acoustic interference caused by laser detected underwater acoustic signals. The results show that the sensitivity of acoustic signal features extracted by MRA is better than that of traditional FFT. In the MRA processing method, the feature is divided into two parts: high pass feature reflecting the fine structure of the target and low pass feature reflecting the contour of the target. The experimental results also show that the theory is very suitable for weak signal detection.